MC68HC711E9CFN2 [MOTOROLA]
Microcontrollers; 微控制器型号: | MC68HC711E9CFN2 |
厂家: | MOTOROLA |
描述: | Microcontrollers |
文件: | 总268页 (文件大小:3562K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Freescale Semiconductor, Inc.
M68HC11E Family
Data Sheet
M68HC11
Microcontrollers
M68HC11E/D
Rev. 5
6/2003
MOTOROLA.COM/SEMICONDUCTORS
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
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Freescale Semiconductor, Inc.
MC68HC11E Family
Data Sheet
To provide the most up-to-date information, the revision of our documents on the
World Wide Web will be the most current. Your printed copy may be an earlier
revision. To verify you have the latest information available, refer to:
http://www.motorola.com/semiconductors/
The following revision history table summarizes changes contained in this
document. For your convenience, the page number designators have been linked
to the appropriate location.
Motorola and the Stylized M Logo are registered trademarks of Motorola, Inc.
DigitalDNA is a trademark of Motorola, Inc.
© Motorola, Inc., 2003
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
3
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Revision History
Revision History
Revision
Level
Page
Number(s)
Date
Description
2.3.3.1 System Configuration Register — Addition to NOCOP bit
description
49
May, 2001
June, 2001
3.1
Added 10.21 EPROM Characteristics
191
191
10.21 EPROM Characteristics — For clarity, addition to note 2 following the
table
3.2
3.3
December,
2001
7.7.2 Serial Communications Control Register 1 — SCCR1 bit 4 (M)
description corrected
123
169
170
173
179
183
185
10.7 MC68L11E9/E20 DC Electrical Characteristics — Title changed to
include the MC68L11E20
10.8 MC68L11E9/E20 Supply Currents and Power Dissipation — Title
changed to include the MC68L11E20
10.10 MC68L11E9/E20 Control Timing — Title changed to include the
MC68L11E20
10.12 MC68L11E9/E20 Peripheral Port Timing — Title changed to include
the MC68L11E20
July, 2002
4
10.14 MC68L11E9/E20 Analog-to-Digital Converter Characteristics —
Title changed to include the MC68L11E20
10.16 MC68L11E9/E20 Expansion Bus Timing Characteristics — Title
changed to include the MC68L11E20
10.18 MC68L11E9/E20 Serial Peirpheral Interface Characteristics — Title
changed to include the MC68L11E20
188
191
— Title changed to include the MC68L11E20
11.4 Extended Voltage Device Ordering Information (3.0 Vdc to 5.5 Vdc)
— Updated table to include MC68L1120
197
Format updated to current publications standards
Throughout
26
1.4.6 Non-Maskable Interrupt (XIRQ/VPPE) — Added Caution note
pertaining to EPROM programming of the MC68HC711E9 device only.
June, 2003
5
10.21 EPROM Characteristics — Added note pertaining to EPROM
programming of the MC68HC711E9 device only.
191
Data Sheet
4
M68HC11E Family — Rev. 5
MOTOROLA
Revision History
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Data Sheet — M68HC11E Family
List of Sections
Section 1. General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Section 2. Operating Modes and On-Chip Memory . . . . . . . . . . . . . . .33
Section 3. Analog-to-Digital (A/D) Converter . . . . . . . . . . . . . . . . . . . .63
Section 4. Central Processor Unit (CPU) . . . . . . . . . . . . . . . . . . . . . . .73
Section 5. Resets and Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
Section 6. Parallel Input/Output (I/O) Ports . . . . . . . . . . . . . . . . . . . .109
Section 7. Serial Communications Interface (SCI). . . . . . . . . . . . . . .117
Section 8. Serial Peripheral Interface (SPI) . . . . . . . . . . . . . . . . . . . .133
Section 9. Timing System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Section 10. Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . .165
Section 11. Ordering Information
and Mechanical Specifications . . . . . . . . . . . . . . . . . . .193
Appendix A. Development Support. . . . . . . . . . . . . . . . . . . . . . . . . . .203
Appendix B. EVBU Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207
AN1060 — M68HC11 Bootstrap Mode . . . . . . . . . . . . . . . . . . . . . . . .209
EB184 — Enabling the Security Feature
on the MC68HC711E9 Devices with PCbug11
on the M68HC711E9PGMR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .255
EB188 — Enabling the Security Feature
on M68HC811E2 Devices with PCbug11
on the M68HC711E9PGMR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259
EB296 — Programming MC68HC711E9 Devices
with PCbug11 and the M68HC11EVBU . . . . . . . . . . . . . . . . . . . . .263
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
5
List of Sections
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List of Sections
Data Sheet
6
M68HC11E Family — Rev. 5
MOTOROLA
List of Sections
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Technical Data — M68HC11E Family
Table of Contents
Section 1. General Description
1.1
1.2
1.3
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.4
1.4.1
1.4.2
1.4.3
VDD and VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Crystal Driver and External Clock Input
(XTAL and EXTAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
E-Clock Output (E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Interrupt Request (IRQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Non-Maskable Interrupt (XIRQ/VPPE). . . . . . . . . . . . . . . . . . . . . . . . 26
MODA and MODB (MODA/LIR and MODB/VSTBY) . . . . . . . . . . . . . 26
1.4.4
1.4.5
1.4.6
1.4.7
1.4.7.1
1.4.8
1.4.9
1.4.10
1.4.10.1
1.4.10.2
1.4.10.3
1.4.10.4
1.4.10.5
VRL and VRH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
STRA/AS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
STRB/R/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Port Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Port E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Section 2. Operating Modes and On-Chip Memory
2.1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.2
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Single-Chip Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Expanded Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Test Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Bootstrap Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.2.1
2.2.2
2.2.3
2.2.4
2.3
2.3.1
2.3.2
Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
RAM and Input/Output Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Mode Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
M68HC11E Family — Rev. 5
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Table of Contents
2.3.3
System Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
System Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
RAM and I/O Mapping Register . . . . . . . . . . . . . . . . . . . . . . . . . . 50
System Configuration Options Register . . . . . . . . . . . . . . . . . . . . 51
2.3.3.1
2.3.3.2
2.3.3.3
2.4
EPROM/OTPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Programming an Individual EPROM Address. . . . . . . . . . . . . . . . . . 53
Programming the EPROM with Downloaded Data. . . . . . . . . . . . . . 54
EPROM and EEPROM Programming Control Register . . . . . . . . . . 54
2.4.1
2.4.2
2.4.3
2.5
2.5.1
EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
EEPROM and CONFIG Programming and Erasure. . . . . . . . . . . . . 57
Block Protect Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
EPROM and EEPROM Programming Control Register . . . . . . . . 58
EEPROM Bulk Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
EEPROM Row Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
EEPROM Byte Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
CONFIG Register Programming . . . . . . . . . . . . . . . . . . . . . . . . . . 61
EEPROM Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
2.5.1.1
2.5.1.2
2.5.1.3
2.5.1.4
2.5.1.5
2.5.1.6
2.5.2
Section 3. Analog-to-Digital (A/D) Converter
3.1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.2
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Analog Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Digital Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Result Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
A/D Converter Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Conversion Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.3
3.4
3.5
3.6
3.7
3.8
3.9
A/D Converter Power-Up and Clock Select . . . . . . . . . . . . . . . . . . . . . . 66
Conversion Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Channel Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Single-Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Multiple-Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Operation in Stop and Wait Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
A/D Control/Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
3.10 A/D Converter Result Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Section 4. Central Processor Unit (CPU)
4.1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.2
CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Accumulators A, B, and D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Index Register X (IX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Index Register Y (IY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4.2.1
4.2.2
4.2.3
Data Sheet
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Table of Contents
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4.2.4
4.2.5
4.2.6
Stack Pointer (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Program Counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Condition Code Register (CCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Carry/Borrow (C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Overflow (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Zero (Z) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Negative (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Interrupt Mask (I). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Half Carry (H) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
X Interrupt Mask (X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
STOP Disable (S) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.2.6.1
4.2.6.2
4.2.6.3
4.2.6.4
4.2.6.5
4.2.6.6
4.2.6.7
4.2.6.8
4.3
4.4
Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Opcodes and Operands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4.5
Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Immediate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Direct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Extended. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Indexed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Inherent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Relative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6
4.6
Instruction Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Section 5. Resets and Interrupts
5.1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
5.2
Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
External Reset (RESET). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Computer Operating Properly (COP) Reset . . . . . . . . . . . . . . . . . . . 90
Clock Monitor Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
System Configuration Options Register . . . . . . . . . . . . . . . . . . . . . . 92
Configuration Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.3
Effects of Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Central Processor Unit (CPU). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Real-Time Interrupt (RTI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Pulse Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Computer Operating Properly (COP) . . . . . . . . . . . . . . . . . . . . . . . . 95
Serial Communications Interface (SCI) . . . . . . . . . . . . . . . . . . . . . . 95
Serial Peripheral Interface (SPI). . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Analog-to-Digital (A/D) Converter. . . . . . . . . . . . . . . . . . . . . . . . . . . 95
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7
5.3.8
5.3.9
5.3.10
5.4
5.4.1
Reset and Interrupt Priority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Highest Priority Interrupt and Miscellaneous Register . . . . . . . . . . . 97
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5.5
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Interrupt Recognition and Register Stacking . . . . . . . . . . . . . . . . . 100
Non-Maskable Interrupt Request (XIRQ) . . . . . . . . . . . . . . . . . . . . 100
Illegal Opcode Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Software Interrupt (SWI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Maskable Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Reset and Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
5.5.6
5.6
5.6.1
5.6.2
Low-Power Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Section 6. Parallel Input/Output (I/O) Ports
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Port E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Handshake Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Parallel I/O Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Section 7. Serial Communications Interface (SCI)
7.1
7.2
7.3
7.4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Transmit Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Receive Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
7.5
7.5.1
7.5.2
Wakeup Feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Idle-Line Wakeup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Address-Mark Wakeup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
7.6
SCI Error Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
7.7
SCI Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Serial Communications Data Register . . . . . . . . . . . . . . . . . . . . . . 122
Serial Communications Control Register 1. . . . . . . . . . . . . . . . . . . 123
Serial Communications Control Register 2. . . . . . . . . . . . . . . . . . . 124
Serial Communication Status Register. . . . . . . . . . . . . . . . . . . . . . 125
Baud Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
7.7.1
7.7.2
7.7.3
7.7.4
7.7.5
7.8
7.9
Status Flags and Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Receiver Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Data Sheet
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Section 8. Serial Peripheral Interface (SPI)
8.1
8.2
8.3
8.4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
SPI Transfer Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Clock Phase and Polarity Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
8.5
SPI Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Master In/Slave Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Master Out/Slave In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Serial Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Slave Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
8.5.1
8.5.2
8.5.3
8.5.4
8.6
SPI System Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
8.7
SPI Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Serial Peripheral Control Register . . . . . . . . . . . . . . . . . . . . . . . . . 138
Serial Peripheral Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Serial Peripheral Data I/O Register . . . . . . . . . . . . . . . . . . . . . . . . 140
8.7.1
8.7.2
8.7.3
Section 9. Timing System
9.1
9.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Timer Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
9.3
Input Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Timer Control Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Timer Input Capture Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Timer Input Capture 4/Output Compare 5 Register . . . . . . . . . . . . 148
9.3.1
9.3.2
9.3.3
9.4
Output Compare. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Timer Output Compare Registers. . . . . . . . . . . . . . . . . . . . . . . . . . 149
Timer Compare Force Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Output Compare Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Output Compare Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Timer Counter Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Timer Control Register 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Timer Interrupt Mask 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Timer Interrupt Flag 1 Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Timer Interrupt Mask 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Timer Interrupt Flag Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
9.4.1
9.4.2
9.4.3
9.4.4
9.4.5
9.4.6
9.4.7
9.4.8
9.4.9
9.4.10
9.5
Real-Time Interrupt (RTI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Timer Interrupt Mask Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Timer Interrupt Flag Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Pulse Accumulator Control Register. . . . . . . . . . . . . . . . . . . . . . . . 159
9.5.1
9.5.2
9.5.3
9.6
Computer Operating Properly (COP) Watchdog Function . . . . . . . . . . 159
9.7
Pulse Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Pulse Accumulator Control Register. . . . . . . . . . . . . . . . . . . . . . . . 161
Pulse Accumulator Count Register. . . . . . . . . . . . . . . . . . . . . . . . . 162
Pulse Accumulator Status and Interrupt Bits . . . . . . . . . . . . . . . . . 162
9.7.1
9.7.2
9.7.3
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Section 10. Electrical Characteristics
10.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
10.2 Maximum Ratings for Standard
and Extended Voltage Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
10.3 Functional Operating Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
10.4 Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
10.5 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
10.6 Supply Currents and Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . 168
10.7 MC68L11E9/E20 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . 169
10.8 MC68L11E9/E20 Supply Currents
and Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
10.9 Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
10.10 MC68L11E9/E20 Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
10.11 Peripheral Port Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
10.12 MC68L11E9/E20 Peripheral Port Timing . . . . . . . . . . . . . . . . . . . . . . . 179
10.13 Analog-to-Digital Converter Characteristics . . . . . . . . . . . . . . . . . . . . . 182
10.14 MC68L11E9/E20 Analog-to-Digital
Converter Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
10.15 Expansion Bus Timing Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 184
10.16 MC68L11E9/E20 Expansion Bus Timing Characteristics. . . . . . . . . . . 185
10.17 Serial Peripheral Interface Timing Characteristics . . . . . . . . . . . . . . . . 187
10.18 MC68L11E9/E20 Serial Peripheral Interface Characteristics. . . . . . . . 188
10.19 EEPROM Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
10.20 MC68L11E9/E20 EEPROM Characteristics. . . . . . . . . . . . . . . . . . . . . 191
10.21 EPROM Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Section 11. Ordering Information
and Mechanical Specifications
11.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
11.2 Standard Device Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . 193
11.3 Custom ROM Device Ordering Information . . . . . . . . . . . . . . . . . . . . . 196
11.4 Extended Voltage Device Ordering Information
(3.0 Vdc to 5.5 Vdc). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
11.5 52-Pin Plastic-Leaded Chip Carrier (Case 778) . . . . . . . . . . . . . . . . . . 198
11.6 52-Pin Windowed Ceramic-Leaded Chip Carrier
(Case 778B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
11.7 64-Pin Quad Flat Pack (Case 840C) . . . . . . . . . . . . . . . . . . . . . . . . . . 200
11.8 52-Pin Thin Quad Flat Pack (Case 848D) . . . . . . . . . . . . . . . . . . . . . . 201
Data Sheet
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11.9 56-Pin Dual in-Line Package (Case 859) . . . . . . . . . . . . . . . . . . . . . . . 202
11.10 48-Pin Plastic DIP (Case 767) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Appendix A. Development Support
A.1
A.2
A.3
A.4
A.5
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Motorola M68HC11 E-Series Development Tools . . . . . . . . . . . . . . . . 203
EVS — Evaluation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Motorola Modular Development System (MMDS11) . . . . . . . . . . . . . . 204
SPGMR11 — Serial Programmer for M68HC11 MCUs . . . . . . . . . . . . 206
Appendix B. EVBU Schematic
MC68HC11EVBU Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
AN1060
AN1060 — M68HC11 Bootstrap Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
EB184
EB184 — Enabling the Security Feature on the MC68HC711E9
Devices with PCbug11 on the M68HC711E9PGMR . . . . . . . . . . . . . . . . . 255
EB188
EB188 — Enabling the Security Feature on M68HC811E2
Devices with PCbug11 on the M68HC711E9PGMR . . . . . . . . . . . . . . . . . 259
EB296
EB296 — Programming MC68HC711E9 Devices
with PCbug11 and the M68HC11EVBU . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
M68HC11E Family — Rev. 5
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Table of Contents
Data Sheet
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Data Sheet — M68HC11E Family
Section 1. General Description
1.1 Introduction
This document contains a detailed description of the M68HC11 E series of 8-bit
microcontroller units (MCUs). These MCUs all combine the M68HC11 central
processor unit (CPU) with high-performance, on-chip peripherals.
The E series is comprised of many devices with various configurations of:
•
•
•
•
•
Random-access memory (RAM)
Read-only memory (ROM)
Erasable programmable read-only memory (EPROM)
Electrically erasable programmable read-only memory (EEPROM)
Several low-voltage devices are also available.
With the exception of a few minor differences, the operation of all E-series MCUs
is identical. A fully static design and high-density complementary metal-oxide
semiconductor (HCMOS) fabrication process allow the E-series devices to operate
at frequencies from 3 MHz to dc with very low power consumption.
1.2 Features
Features of the E-series devices include:
•
•
•
•
•
•
•
•
M68HC11 CPU
Power-saving stop and wait modes
Low-voltage devices available (3.0–5.5 Vdc)
0, 256, 512, or 768 bytes of on-chip RAM, data retained during standby
0, 12, or 20 Kbytes of on-chip ROM or EPROM
0, 512, or 2048 bytes of on-chip EEPROM with block protect for security
2048 bytes of EEPROM with selectable base address in the MC68HC811E2
Asynchronous non-return-to-zero (NRZ) serial communications interface
(SCI)
•
•
•
Additional baud rates available on MC68HC(7)11E20
Synchronous serial peripheral interface (SPI)
8-channel, 8-bit analog-to-digital (A/D) converter
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General Description
•
16-bit timer system:
–
–
–
Three input capture (IC) channels
Four output compare (OC) channels
One additional channel, selectable as fourth IC or fifth OC
•
•
•
•
8-bit pulse accumulator
Real-time interrupt circuit
Computer operating properly (COP) watchdog system
38 general-purpose input/output (I/O) pins:
–
–
–
16 bidirectional I/O pins
11 input-only pins
11 output-only pins
•
Several packaging options:
–
–
–
–
–
–
52-pin plastic-leaded chip carrier (PLCC)
52-pin windowed ceramic leaded chip carrier (CLCC)
52-pin plastic thin quad flat pack, 10 mm x 10 mm (TQFP)
64-pin quad flat pack (QFP)
48-pin plastic dual in-line package (DIP), MC68HC811E2 only
56-pin plastic shrink dual in-line package, .070-inch lead spacing (SDIP)
1.3 Structure
See Figure 1-1 for a functional diagram of the E-series MCUs. Differences among
devices are noted in the table accompanying Figure 1-1.
Data Sheet
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M68HC11E Family — Rev. 5
General Description
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General Description
Structure
MODA/ MODB/
LIR VSTBY
XTAL EXTAL
E
IRQ XIRQ/VPPE* RESET
OSC
INTERRUPT
LOGIC
MODE CONTROL
ROM OR EPROM
(SEE TABLE)
CLOCK LOGIC
TIMER
SYSTEM
EEPROM
(SEE TABLE)
M68HC11 CPU
RAM
(SEE TABLE)
SERIAL
COMMUNICATION
SERIAL
PERIPHERAL
INTERFACE
SPI
BUS EXPANSION
ADDRESS
ADDRESS/DATA
VDD
VSS
INTERFACE
SCI
VRH
VRL
STROBE AND HANDSHAKE
PARALLEL I/O
A/D CONVERTER
CONTROL
CONTROL
PORT A
PORT B
PORT C
PORT D
PORT E
DEVICE
RAM
ROM
EPROM EEPROM
MC68HC11E0
MC68HC11E1
MC68HC11E9
MC68HC711E9
MC68HC11E20
MC68HC711E20
MC68HC811E2
512
512
512
512
768
768
256
—
—
12 K
—
20 K
—
—
—
—
—
12 K
—
20 K
—
—
512
512
512
512
512
2048
* VPPE applies only to devices with EPROM/OTPROM.
Figure 1-1. M68HC11 E-Series Block Diagram
M68HC11E Family — Rev. 5
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General Description
1.4 Pin Descriptions
M68HC11 E-series MCUs are available packaged in:
•
•
•
•
•
•
52-pin plastic-leaded chip carrier (PLCC)
52-pin windowed ceramic leaded chip carrier (CLCC)
52-pin plastic thin quad flat pack, 10 mm x 10 mm (TQFP)
64-pin quad flat pack (QFP)
48-pin plastic dual in-line package (DIP), MC68HC811E2 only
56-pin plastic shrink dual in-line package, .070-inch lead spacing (SDIP)
Most pins on these MCUs serve two or more functions, as described in the
following paragraphs. Refer to Figure 1-2, Figure 1-3, Figure 1-4, Figure 1-5, and
Figure 1-6 which show the M68HC11 E-series pin assignments for the
PLCC/CLCC, QFP, TQFP, SDIP, and DIP packages.
46 PE5/AN5
PE1/AN1
45
XTAL
8
9
PC0/ADDR0/DATA0
PC1/ADDR1/DATA1 10
44 PE4/AN4
43 PE0/AN0
42 PB0/ADDR8
11
12
13
14
15
16
PC2/ADDR2/DATA2
PC3/ADDR3/DATA3
PC4/ADDR4/DATA4
PC5/ADDR5/DATA5
PC6/ADDR6/DATA6
PC7/ADDR7/DATA7
PB1/ADDR9
40 PB2/ADDR10
41
M68HC11 E SERIES
PB3/ADDR11
PB4/ADDR12
39
38
37 PB5/ADDR13
36 PB6/ADDR14
RESET 17
18
19
20
* XIRQ/VPPE
IRQ
PB7/ADDR15
35
34 PA0/IC3
PD0/RxD
* VPPE applies only to devices with EPROM/OTPROM.
Figure 1-2. Pin Assignments for 52-Pin PLCC and CLCC
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General Description
Pin Descriptions
1
2
PA0/IC3
NC
NC
48
47
46
45
44
43
42
41
40
39
38
37
36
PD0/RxD
IRQ
NC
3
(1)
NC
XIRQ/VPPE
NC
4
5
6
7
8
PB7/ADDR15
PB6/ADDR14
PB5/ADDR13
PB4/ADDR12
RESET
PC7/ADDR7/DATA7
PC6/ADDR6/DATA6
PC5/ADDR5/DATA5
PC4/ADDR4/DATA4
PC3/ADDR3/DATA3
PC2/ADDR2/DATA2
PC1/ADDR1/DATA1
NC
M68HC11 E SERIES
PB3/ADDR11
PB2/ADDR10
PB1/ADDR9
PB0/ADDR8
PE0/AN0
9
10
11
12
13
14
15
16
PE4/AN4
35
34
33
PE1/AN1
PC0/ADDR0/DATA0
XTAL
PE5/AN5
1. VPPE applies only to devices with EPROM/OTPROM.
Figure 1-3. Pin Assignments for 64-Pin QFP
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General Description
1
2
PA0/IC3
PB7/ADDR15
PB6/ADDR14
PB5/ADDR13
PB4/ADDR12
PB3/ADDR11
PB2/ADDR10
PB1/ADDR9
PB0/ADDR8
PE0/AN0
PD0/RxD
IRQ
39
38
37
36
35
34
33
32
31
30
29
28
27
(1)
3
XIRQ/VPPE
RESET
4
5
6
7
8
PC7/ADDR7/DATA7
PC6/ADDR6/DATA6
PC5/ADDR5/DATA5
M68HC11 E SERIES
PC4/ADDR4/DATA4
PC3/ADDR3/DATA3
PC2/ADDR2/DATA2
PC1/ADDR1/DATA1
PC0/ADDR0/DATA0
XTAL
9
10
11
12
13
PE4/AN4
PE1/AN1
PE5/AN5
1. VPPE applies only to devices with EPROM/OTPROM.
Figure 1-4. Pin Assignments for 52-Pin TQFP
Data Sheet
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General Description
Pin Descriptions
VSS
EVSS
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
1
2
3
4
5
6
7
8
MODB/VSTBY
VRH
MODA/LIR
STRA/AS
VRL
PE7/AN7
PE3/AN3
PE6/AN6
PE2/AN2
PE5/AN5
PE1/AN1
PE4/AN4
PE0/AN0
PB0/ADDR8
PB1/ADDR9
PB2/ADDR10
PB3/ADDR11
PB4/ADDR12
PB5/ADDR13
PB6/ADDR14
E
STRB/R/W
EXTAL
XTAL
PC0/ADDR0/DATA0
PC1/ADDR1/DATA1
PC2/ADDR2/DATA2
PC3/ADDR3/DATA3
PC4/ADDR4/DATA4
PC5/ADDR5/DATA5
PC6/ADDR6/DATA6
PC7/ADDR7/DATA7
RESET
9
10
11
12
13
14
15
16
17
M68HC11 E SERIES
* XIRQ/VPPE
18
19
20
21
IRQ
PD0/RxD
EVSS
PB7/ADDR15
PA0/IC3
PA1/IC2
PA2/IC1
PD1/TxD
PD2/MISO
PD3/MOSI
PD4/SCK
PD5/SS
VDD
22
23
24
25
26
27
28
PA3/OC5/IC4/OC1
PA4/OC4/OC1
PA5/OC3/OC1
PA6/OC2/OC1
PA7/PAI/OC1
EVDD
VSS
* VPPE applies only to devices with EPROM/OTPROM.
Figure 1-5. Pin Assignments for 56-Pin SDIP
M68HC11E Family — Rev. 5
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General Description
PA7/PAI/OC1
PA6/OC2/OC1
PA5/OC3/OC1
PA4/OC4/OC1
PA3/OC5/IC4/OC1
PA2/IC1
48 VDD
1
PD5/SS
47
2
46 PD4/SCK
3
PD3/MOSI
44 PD2/MISO
PD1/TxD
42 PD0/RxD
IRQ
40 XIRQ
45
4
5
43
6
PA1/IC2
7
PA0/IC3
41
8
PB7/ADDR15
PB6/ADDR14
PB5/ADDR13
PB4/ADDR12
PB3/ADDR11
PB2/ADDR10
PB1/ADDR9
PB0/ADDR8
PE0/AN0
9
RESET
39
10
11
12
13
14
15
16
17
38 PC7/ADDR7/DATA7
37 PC6/ADDR6/DATA6
36 PC5/ADDR5/DATA5
35 PC4/ADDR4/DATA4
34 PC3/ADDR3/DATA3
MC68HC811E2
PC2/ADDR2/DATA2
PC1/ADDR1/DATA1
PC0/ADDR0/DATA0
33
32
31
PE1/AN1
18
19
20
21
PE2/AN2
30 XTAL
PE3/AN3
29 EXTAL
28 STRB/R/W
VRL
VRH
22
23
24
27
E
VSS
26 STRA/AS
25 MODA/LIR
MODB/VSTBY
Figure 1-6. Pin Assignments for 48-Pin DIP (MC68HC811E2)
Data Sheet
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M68HC11E Family — Rev. 5
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General Description
Pin Descriptions
1.4.1 VDD and VSS
Power is supplied to the MCU through VDD and VSS. VDD is the power supply, VSS
is ground. The MCU operates from a single 5-volt (nominal) power supply.
Low-voltage devices in the E series operate at 3.0–5.5 volts.
Very fast signal transitions occur on the MCU pins. The short rise and fall times
place high, short duration current demands on the power supply. To prevent noise
problems, provide good power supply bypassing at the MCU. Also, use bypass
capacitors that have good
high-frequency characteristics and situate them as close to the MCU as possible.
Bypass requirements vary, depending on how heavily the MCU pins are loaded.
V
V
DD
DD
2
4.7 kΩ
IN
1
TO RESET
OF M68HC11
RESET
MC34(0/1)64
GND
3
Figure 1-7. External Reset Circuit
V
V
DD
DD
IN
4.7 kΩ
TO RESET
OF M68HC11
RESET
MC34064
V
DD
GND
4.7 kΩ
1.0 µF
MANUAL
RESET SWITCH
4.7 kΩ
IN
RESET
MC34164
GND
OPTIONAL POWER-ON DELAY AND MANUAL RESET SWITCH
Figure 1-8. External Reset Circuit with Delay
M68HC11E Family — Rev. 5
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General Description
1.4.2 RESET
A bidirectional control signal, RESET, acts as an input to initialize the MCU to a
known startup state. It also acts as an open-drain output to indicate that an internal
failure has been detected in either the clock monitor or computer operating properly
(COP) watchdog circuit. The CPU distinguishes between internal and external
reset conditions by sensing whether the reset pin rises to a logic 1 in less than two
E-clock cycles after a reset has occurred. See Figure 1-7 and Figure 1-8.
CAUTION:
Do not connect an external resistor capacitor (RC) power-up delay circuit to the
reset pin of M68HC11 devices because the circuit charge time constant can cause
the device to misinterpret the type of reset that occurred.
Because the CPU is not able to fetch and execute instructions properly when VDD
falls below the minimum operating voltage level, reset must be controlled. A
low-voltage inhibit (LVI) circuit is required primarily for protection of EEPROM
contents. However, since the configuration register (CONFIG) value is read from
the EEPROM, protection is required even if the EEPROM array is not being used.
Presently, there are several economical ways to solve this problem. For example,
two good external components for LVI reset are:
1. The Seiko S0854HN (or other S805 series devices):
a. Extremely low power (2 µA)
a. TO-92 package
a. Limited temperature range, –20°C to +70°C
a. Available in various trip-point voltage ranges
2. The Motorola MC34064:
a. TO-92 or SO-8 package
a. Draws about 300 µA
a. Temperature range –40°C to 85°C
a. Well controlled trip point
a. Inexpensive
Refer to Section 5. Resets and Interrupts for further information.
1.4.3 Crystal Driver and External Clock Input (XTAL and EXTAL)
These two pins provide the interface for either a crystal or a CMOS- compatible
clock to control the internal clock generator circuitry. The frequency applied to
these pins is four times higher than the desired E-clock rate.
The XTAL pin must be left unterminated when an external CMOS- compatible clock
input is connected to the EXTAL pin. The XTAL output is normally intended to drive
only a crystal. Refer to Figure 1-9 and Figure 1-10.
Data Sheet
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M68HC11E Family — Rev. 5
General Description
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General Description
Pin Descriptions
CAUTION:
In all cases, use caution around the oscillator pins. Load capacitances shown in the
oscillator circuit are specified by the crystal manufacturer and should include all
stray layout capacitances.
CL
EXTAL
10 MΩ
4 x E
CRYSTAL
MCU
CL
XTAL
Figure 1-9. Common Parallel Resonant Crystal Connections
4 x E
CMOS-COMPATIBLE
EXTERNAL OSCILLATOR
EXTAL
MCU
XTAL
NC
Figure 1-10. External Oscillator Connections
1.4.4 E-Clock Output (E)
E is the output connection for the internally generated E clock. The signal from E
is used as a timing reference. The frequency of the E-clock output is one fourth that
of the input frequency at the XTAL and EXTAL pins. When E-clock output is low,
an internal process is taking place. When it is high, data is being accessed.
All clocks, including the E clock, are halted when the MCU is in stop mode. To
reduce RFI emissions, the E-clock output of most E-series devices can be disabled
while operating in single-chip modes.
The E-clock signal is always enabled on the MC68HC811E2.
1.4.5 Interrupt Request (IRQ)
The IRQ input provides a means of applying asynchronous interrupt requests to the
MCU. Either negative edge-sensitive triggering or level-sensitive triggering is
program selectable (OPTION register). IRQ is always configured to level-sensitive
triggering at reset. When using IRQ in a level-sensitive wired-OR configuration,
connect an external pullup resistor, typically 4.7 kΩ, to VDD
.
M68HC11E Family — Rev. 5
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General Description
1.4.6 Non-Maskable Interrupt (XIRQ/VPPE
)
The XIRQ input provides a means of requesting a non-maskable interrupt after
reset initialization. During reset, the X bit in the condition code register (CCR) is set
and any interrupt is masked until MCU software enables it. Because the XIRQ input
is level-sensitive, it can be connected to a multiple-source wired-OR network with
an external pullup resistor to VDD. XIRQ is often used as a power loss detect
interrupt.
Whenever XIRQ or IRQ is used with multiple interrupt sources each source must
drive the interrupt input with an open-drain type of driver to avoid contention
between outputs.
NOTE:
IRQ must be configured for level-sensitive operation if there is more than one
source of IRQ interrupt.
There should be a single pullup resistor near the MCU interrupt input pin (typically
4.7 kΩ). There must also be an interlock mechanism at each interrupt source so
that the source holds the interrupt line low until the MCU recognizes and
acknowledges the interrupt request. If one or more interrupt sources are still
pending after the MCU services a request, the interrupt line will still be held low and
the MCU will be interrupted again as soon as the interrupt mask bit in the MCU is
cleared (normally upon return from an interrupt). Refer to Section 5. Resets and
Interrupts.
VPPE is the input for the 12-volt nominal programming voltage required for
EPROM/OTPROM programming. On devices without EPROM/OTPROM, this pin
is only an XIRQ input.
CAUTION:
During EPROM programming of the MC68HC711E9 device, the VPPE pin circuitry
may latch-up and be damaged if the input current is not limited to 10 mA. For more
information please refer to MC68HC711E9 8-Bit Microcontroller Unit Mask Set
Errata 3 (Motorola document order number 68HC711E9MSE3.
1.4.7 MODA and MODB (MODA/LIR and MODB/VSTBY
)
During reset, MODA and MODB select one of the four operating modes:
•
•
•
•
Single-chip mode
Expanded mode
Test mode
Bootstrap mode
Refer to Section 2. Operating Modes and On-Chip Memory.
After the operating mode has been selected, the load instruction register (LIR) pin
provides an open-drain output to indicate that execution of an instruction has
begun. A series of E-clock cycles occurs during execution of each instruction. The
LIR signal goes low during the first E-clock cycle of each instruction (opcode fetch).
This output is provided for assistance in program debugging.
Data Sheet
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M68HC11E Family — Rev. 5
General Description
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General Description
Pin Descriptions
The VSTBY pin is used to input random-access memory (RAM) standby power.
When the voltage on this pin is more than one MOS threshold (about 0.7 volts)
above the VDD voltage, the internal RAM and part of the reset logic are powered
from this signal rather than the VDD input. This allows RAM contents to be retained
without VDD power applied to the MCU. Reset must be driven low before VDD is
removed and must remain low until VDD has been restored to a valid level.
1.4.7.1 VRL and VRH
These two inputs provide the reference voltages for the analog-to-digital (A/D)
converter circuitry:
•
•
V
RL is the low reference, typically 0 Vdc.
RH is the high reference.
V
For proper A/D converter operation:
•
•
V
RH should be at least 3 Vdc greater than VRL.
RL and VRH should be between VSS and VDD
V
.
1.4.8 STRA/AS
The strobe A (STRA) and address strobe (AS) pin performs either of two separate
functions, depending on the operating mode:
•
In single-chip mode, STRA performs an input handshake (strobe input)
function.
•
In the expanded multiplexed mode, AS provides an address strobe function.
AS can be used to demultiplex the address and data signals at port C. Refer to
Section 2. Operating Modes and On-Chip Memory.
1.4.9 STRB/R/W
The strobe B (STRB) and read/write (R/W) pin act as either an output strobe or as
a data bus direction indicator, depending on the operating mode.
In single-chip operating mode, STRB acts as a programmable strobe for
handshake with other parallel devices. Refer to Section 6. Parallel Input/Output
(I/O) Ports for further information.
In expanded multiplexed operating mode, R/W is used to indicate the direction of
transfers on the external data bus. A low on the R/W pin indicates data is being
written to the external data bus. A high on this pin indicates that a read cycle is in
progress. R/W stays low during consecutive data bus write cycles, such as a
double-byte store. It is possible for data to be driven out of port C, if internal read
visibility (IRV) is enabled and an internal address is read, even though R/W is in a
high-impedance state. Refer to Section 2. Operating Modes and On-Chip
Memory for more information about IRVNE (internal read visibility not E).
M68HC11E Family — Rev. 5
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General Description
1.4.10 Port Signals
Port pins have different functions in different operating modes. Pin functions for
port A, port D, and port E are independent of operating modes. Port B and port C,
however, are affected by operating mode. Port B provides eight general-purpose
output signals in single-chip operating modes. When the microcontroller is in
expanded multiplexed operating mode, port B pins are the eight high-order address
lines.
Port C provides eight general-purpose input/output signals when the MCU is in the
single-chip operating mode. When the microcontroller is in the expanded
multiplexed operating mode, port C pins are a multiplexed address/data bus.
Refer to Table 1-1 for a functional description of the 40 port signals within different
operating modes. Terminate unused inputs and input/output (I/O) pins configured
as inputs high or low.
1.4.10.1 Port A
In all operating modes, port A can be configured for three timer input capture (IC)
functions and four timer output compare (OC) functions. An additional pin can be
configured as either the fourth IC or the fifth OC. Any port A pin that is not currently
being used for a timer function can be used as either a general-purpose input or
output line. Only port A pins PA7 and PA3 have an associated data direction
control bit that allows the pin to be selectively configured as input or output. Bits
DDRA7 and DDRA3 located in PACTL register control data direction for PA7 and
PA3, respectively. All other port A pins are fixed as either input or output.
PA7 can function as general-purpose I/O or as timer output compare for OC1. PA7
is also the input to the pulse accumulator, even while functioning as a
general-purpose I/O or an OC1 output.
PA6–PA4 serve as either general-purpose outputs, timer input captures, or timer
output compare 2–4. In addition, PA6–PA4 can be controlled by OC1.
PA3 can be a general-purpose I/O pin or a timer IC/OC pin. Timer functions
associated with this pin include OC1 and IC4/OC5. IC4/OC5 is software selectable
as either a fourth input capture or a fifth output compare. PA3 can also be
configured to allow OC1 edges to trigger IC4 captures.
PA2–PA0 serve as general-purpose inputs or as IC1–IC3.
PORTA can be read at any time. Reads of pins configured as inputs return the logic
level present on the pin. Pins configured as outputs return the logic level present
at the pin driver input. If written, PORTA stores the data in an internal latch, bits 7
and 3. It drives the pins only if they are configured as outputs. Writes to PORTA do
not change the pin state when pins are configured for timer input captures or output
compares. Refer to Section 6. Parallel Input/Output (I/O) Ports.
Data Sheet
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M68HC11E Family — Rev. 5
General Description
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General Description
Pin Descriptions
Table 1-1. Port Signal Functions
Single-Chip and
Port/Bit
Expanded and
Test Modes
Bootstrap Modes
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PD0
PD1
PD2
PD3
PD4
PD5
—
PA0/IC3
PA1/IC2
PA2/IC1
PA3/OC5/IC4/OC1
PA4/OC4/OC1
PA5/OC3/OC1
PA6/OC2/OC1
PA7/PAI/OC1
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
ADDR8
ADDR9
ADDR10
ADDR11
ADDR12
ADDR13
ADDR14
ADDR15
ADDR0/DATA0
ADDR1/DATA1
ADDR2/DATA2
ADDR3/DATA3
ADDR4/DATA4
ADDR5/DATA5
ADDR6/DATA6
ADDR7/DATA7
PD0/RxD
PD1/TxD
PD2/MISO
PD3/MOSI
PD4/SCK
PD5/SS
STRA
STRB
AS
—
R/W
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
PE0/AN0
PE1/AN1
PE3/AN2
PE3/AN3
PE4/AN4
PE5/AN5
PE6/AN6
PE7/AN7
M68HC11E Family — Rev. 5
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General Description
1.4.10.2 Port B
During single-chip operating modes, all port B pins are general-purpose output
pins. During MCU reads of this port, the level sensed at the input side of the port B
output drivers is read. Port B can also be used in simple strobed output mode. In
this mode, an output pulse appears at the STRB signal each time data is written to
port B.
In expanded multiplexed operating modes, all of the port B pins act as high order
address output signals. During each MCU cycle, bits 15–8 of the address bus are
output on the PB7–PB0 pins. The PORTB register is treated as an external
address in expanded modes.
1.4.10.3 Port C
While in single-chip operating modes, all port C pins are general-purpose I/O pins.
Port C inputs can be latched into an alternate PORTCL register by providing an
input transition to the STRA signal. Port C can also be used in full handshake
modes of parallel I/O where the STRA input and STRB output act as handshake
control lines.
When in expanded multiplexed modes, all port C pins are configured as
multiplexed address/data signals. During the address portion of each MCU cycle,
bits 7–0 of the address are output on the PC7–PC0 pins. During the data portion
of each MCU cycle (E high), PC7–PC0 are bidirectional data signals,
DATA7–DATA0. The direction of data at the port C pins is indicated by the R/W
signal.
The CWOM control bit in the PIOC register disables the port C P-channel output
driver. CWOM simultaneously affects all eight bits of port C. Because the
N-channel driver is not affected by CWOM, setting CWOM causes port C to
become an open-drain type output port suitable for wired-OR operation.
In wired-OR mode:
•
•
When a port C bit is at logic level 0, it is driven low by the N-channel driver.
When a port C bit is at logic level 1, the associated pin has high-impedance,
as neither the N-channel nor the P-channel devices are active.
It is customary to have an external pullup resistor on lines that are driven by
open-drain devices. Port C can only be configured for wired-OR operation when
the MCU is in single-chip mode. Refer to Section 6. Parallel Input/Output (I/O)
Ports for additional information about port C functions.
Data Sheet
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M68HC11E Family — Rev. 5
General Description
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General Description
Pin Descriptions
1.4.10.4 Port D
Pins PD5–PD0 can be used for general-purpose I/O signals. These pins alternately
serve as the serial communication interface (SCI) and serial peripheral interface
(SPI) signals when those subsystems are enabled.
•
•
•
PD0 is the receive data input (RxD) signal for the SCI.
PD1 is the transmit data output (TxD) signal for the SCI.
PD5–PD2 are dedicated to the SPI:
–
–
–
–
PD2 is the master in/slave out (MISO) signal.
PD3 is the master out/slave in (MOSI) signal.
PD4 is the serial clock (SCK) signal.
PD5 is the slave select (SS) input.
1.4.10.5 Port E
Use port E for general-purpose or analog-to-digital (A/D) inputs.
CAUTION:
If high accuracy is required for A/D conversions, avoid reading port E during
sampling, as small disturbances can reduce the accuracy of that result.
M68HC11E Family — Rev. 5
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General Description
Data Sheet
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M68HC11E Family — Rev. 5
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Data Sheet — M68HC11E Family
Section 2. Operating Modes and On-Chip Memory
2.1 Introduction
This section contains information about the operating modes and the on-chip
memory for M68HC11 E-series MCUs. Except for a few minor differences,
operation is identical for all devices in the E series. Differences are noted where
necessary.
2.2 Operating Modes
The values of the mode select inputs MODB and MODA during reset determine the
operating mode. Single-chip and expanded multiplexed are the normal modes.
•
•
In single-chip mode only on-chip memory is available.
Expanded mode, however, allows access to external memory.
Each of the two normal modes is paired with a special mode:
•
Bootstrap, a variation of the single-chip mode, is a special mode that
executes a bootloader program in an internal bootstrap ROM.
•
Test is a special mode that allows privileged access to internal resources.
2.2.1 Single-Chip Mode
In single-chip mode, ports B and C and strobe pins A (STRA) and B (STRB) are
available for general-purpose parallel input/output (I/O). In this mode, all software
needed to control the MCU is contained in internal resources. If present, read-only
memory (ROM) and/or erasable, programmable read-only memory (EPROM) will
always be enabled out of reset, ensuring that the reset and interrupt vectors will be
available at locations $FFC0–$FFFF.
NOTE:
For the MC68HC811E2, the vector locations are the same; however, they are
contained in the 2048-byte EEPROM array.
2.2.2 Expanded Mode
In expanded operating mode, the MCU can access the full 64-Kbyte address
space. The space includes:
•
•
The same on-chip memory addresses used for single-chip mode
Addresses for external peripherals and memory devices
M68HC11E Family — Rev. 5
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Operating Modes and On-Chip Memory
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Operating Modes and On-Chip Memory
The expansion bus is made up of ports B and C, and control signals AS (address
strobe) and R/W (read/write). R/W and AS allow the low-order address and the
8-bit data bus to be multiplexed on the same pins. During the first half of each bus
cycle address information is present. During the second half of each bus cycle the
pins become the bidirectional data bus. AS is an active-high latch enable signal for
an external address latch. Address information is allowed through the transparent
latch while AS is high and is latched when AS drives low.
The address, R/W, and AS signals are active and valid for all bus cycles, including
accesses to internal memory locations. The E clock is used to enable external
devices to drive data onto the internal data bus during the second half of a read bus
cycle (E clock high). R/W controls the direction of data transfers. R/W drives low
when data is being written to the internal data bus. R/W will remain low during
consecutive data bus write cycles, such as when a double-byte store occurs.
Refer to Figure 2-1.
NOTE:
The write enable signal for an external memory is the NAND of the E clock and the
inverted R/W signal.
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
ADDR15
ADDR14
ADDR13
ADDR12
ADDR11
ADDR10
ADDR9
ADDR8
HC373
Q1
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
D1
D2
D3
D4
D5
D6
D7
D8
ADDR7
ADDR6
ADDR5
ADDR4
ADDR3
ADDR2
ADDR1
ADDR0
Q2
Q3
Q4
Q5
Q6
Q7
Q8
LE
OE
AS
R/W
E
WE
OE
DATA7
DATA6
DATA5
DATA4
DATA3
DATA2
DATA1
DATA0
MCU
Figure 2-1. Address/Data Demultiplexing
2.2.3 Test Mode
Test mode, a variation of the expanded mode, is primarily used during Motorola’s
internal production testing; however, it is accessible for programming the
Data Sheet
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M68HC11E Family — Rev. 5
Operating Modes and On-Chip Memory
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Operating Modes and On-Chip Memory
Memory Map
configuration (CONFIG) register, programming calibration data into electrically
erasable, programmable read-only memory (EEPROM), and supporting emulation
and debugging during development.
2.2.4 Bootstrap Mode
When the MCU is reset in special bootstrap mode, a small on-chip read-only
memory (ROM) is enabled at address $BF00–$BFFF. The ROM contains a
bootloader program and a special set of interrupt and reset vectors. The MCU
fetches the reset vector, then executes the bootloader.
Bootstrap mode is a special variation of the single-chip mode. Bootstrap mode
allows special-purpose programs to be entered into internal random-access
memory (RAM). When bootstrap mode is selected at reset, a small bootstrap ROM
becomes present in the memory map. Reset and interrupt vectors are located in
this ROM at $BFC0–$BFFF. The bootstrap ROM contains a small program which
initializes the serial communications interface (SCI) and allows the user to
download a program into on-chip RAM. The size of the downloaded program can
be as large as the size of the on-chip RAM. After a 4-character delay, or after
receiving the character for the highest address in RAM, control passes to the
loaded program at $0000. Refer to Figure 2-2, Figure 2-3, Figure 2-4, Figure 2-5,
and Figure 2-6.
Use of an external pullup resistor is required when using the SCI transmitter pin
because port D pins are configured for wired-OR operation by the bootloader. In
bootstrap mode, the interrupt vectors are directed to RAM. This allows the use of
interrupts through a jump table. Refer to the application note AN1060 entitled
M68HC11 Bootstrap Mode, that is included in this data book.
2.3 Memory Map
The operating mode determines memory mapping and whether external
addresses can be accessed. Refer to Figure 2-2, Figure 2-3, Figure 2-4,
Figure 2-5, and Figure 2-6, which illustrate the memory maps for each of the three
families comprising the M68HC11 E series of MCUs.
Memory locations for on-chip resources are the same for both expanded and
single-chip modes. Control bits in the configuration (CONFIG) register allow
EPROM and EEPROM (if present) to be disabled from the memory map. The RAM
is mapped to $0000 after reset. It can be placed at any 4-Kbyte boundary ($x000)
by writing an appropriate value to the RAM and I/O map register (INIT). The 64-byte
register block is mapped to $1000 after reset and also can be placed at any 4-Kbyte
boundary ($x000) by writing an appropriate value to the INIT register. If RAM and
registers are mapped to the same boundary, the first 64 bytes of RAM will be
inaccessible.
Refer to Figure 2-7, which details the MCU register and control bit assignments.
Reset states shown are for single-chip mode only.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
35
Operating Modes and On-Chip Memory
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Operating Modes and On-Chip Memory
$0000
$1000
0000
512 BYTES RAM
EXT
EXT
01FF
1000
64-BYTE REGISTER BLOCK
103F
$B600
$D000
$FFFF
EXT
EXT
BOOT
ROM
BFC0
BFFF
BF00
BFFF
SPECIAL MODES
INTERRUPT
VECTORS
NORMAL
MODES
INTERRUPT
VECTORS
FFC0
FFFF
EXPANDED
BOOTSTRAP
SPECIAL
TEST
Figure 2-2. Memory Map for MC68HC11E0
0000
$0000
$1000
512 BYTES RAM
EXT
EXT
EXT
01FF
1000
64-BYTE REGISTER BLOCK
103F
EXT
B600
512 BYTES EEPROM
$B600
$D000
$FFFF
B7FF
BF00
BOOT
ROM
BFC0
BFFF
SPECIAL MODES
INTERRUPT
VECTORS
EXT
EXT
BFFF
NORMAL
MODES
INTERRUPT
VECTORS
FFC0
FFFF
EXPANDED
BOOTSTRAP
SPECIAL
TEST
Figure 2-3. Memory Map for MC68HC11E1
Data Sheet
36
M68HC11E Family — Rev. 5
MOTOROLA
Operating Modes and On-Chip Memory
For More Information On This Product,
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Operating Modes and On-Chip Memory
Memory Map
0000
$0000
$1000
512 BYTES RAM
EXT
EXT
EXT
EXT
01FF
1000
64-BYTE REGISTER BLOCK
103F
B600
512 BYTES EEPROM
$B600
$D000
$FFFF
B7FF
BF00
BOOT
ROM
BFC0
BFFF
SPECIAL MODES
INTERRUPT
VECTORS
EXT
EXT
BFFF
D000
12 KBYTES ROM/EPROM
FFC0
NORMAL
MODES
INTERRUPT
VECTORS
FFFF
FFFF
SINGLE
CHIP
EXPANDED
BOOTSTRAP
SPECIAL
TEST
Figure 2-4. Memory Map for MC68HC(7)11E9
0000
$0000
$1000
768 BYTES RAM
EXT
EXT
EXT
EXT
02FF
1000
64-BYTE REGISTER BLOCK
103F
9000
8 KBYTES ROM/EPROM *
512 BYTES EEPROM
$9000
$B600
AFFF
B600
EXT
EXT
EXT
EXT
B7FF
BF00
BOOT
BFC0
ROM
SPECIAL MODES
INTERRUPT
VECTORS
BFFF
BFFF
D000
$D000
$FFFF
12 KBYTES ROM/EPROM *
FFC0
NORMAL
MODES
INTERRUPT
FFFF
FFFF VECTORS
SINGLE
CHIP
EXPANDED
BOOTSTRAP
SPECIAL
TEST
* 20 Kbytes ROM/EPROM are contained in two segments of 8 Kbytes and 12 Kbytes each.
Figure 2-5. Memory Map for MC68HC(7)11E20
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
37
Operating Modes and On-Chip Memory
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Operating Modes and On-Chip Memory
$0000
$1000
0000
00FF
256 BYTES RAM
EXT
EXT
1000
103F
64-BYTE REGISTER BLOCK
EXT
EXT
BOOT
ROM
BFC0
BFFF
SPECIAL MODES
INTERRUPT
VECTORS
BF00
BFFF
2048 BYTES EEPROM
$F800
$FFFF
F800
FFFF
NORMAL
MODES
INTERRUPT
FFC0
FFFF VECTORS
SINGLE
CHIP
EXPANDED
BOOTSTRAP
SPECIAL
TEST
Figure 2-6. Memory Map for MC68HC811E2
Addr.
$1000
$1001
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
(PORTA) Write:
Port A Data Register
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
See page 110.
Reset:
I
0
0
0
I
I
I
I
Reserved
R
R
R
R
R
R
R
R
Read:
Parallel I/O Control Register
STAF
0
STAI
0
CWOM
0
HNDS
0
OIN
0
PLS
U
EGA
1
INVB
1
$1002
$1003
$1004
(PIOC) Write:
See page 115.
Reset:
Read:
Port C Data Register
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
(PORTC) Write:
See page 111.
Reset:
Read:
Indeterminate after reset
Port B Data Register
PB7
0
PB6
0
PB5
0
PB4
PB3
PB2
0
PB1
0
PB0
0
(PORTB) Write:
See page 111.
Reset:
0
0
= Unimplemented
I = Indeterminate after reset
R
= Reserved
U = Unaffected
Figure 2-7. Register and Control Bit Assignments (Sheet 1 of 6)
Data Sheet
38
M68HC11E Family — Rev. 5
MOTOROLA
Operating Modes and On-Chip Memory
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Operating Modes and On-Chip Memory
Memory Map
Addr.
$1005
$1006
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Port C Latched Register
PCL7
PCL6
PCL5
PCL4
PCL3
PCL2
PCL1
PCL0
(PORTCL) Write:
See page 112.
Reset:
Indeterminate after reset
Reserved
R
R
R
R
R
R
R
R
Read:
Port C Data Direction Register
DDRC7 DDRC6
DDRC5
DDRC4
DDRC3
DDRC2
DDRC1 DDRC0
$1007
$1008
$1009
$100A
$100B
$100C
$100D
$100E
$100F
$1010
$1011
(DDRC) Write:
See page 112.
Reset:
Read:
0
0
0
0
0
PD5
I
0
PD4
I
0
PD3
I
0
PD2
I
0
PD1
I
0
PD0
I
Port D Data Register
(PORTD) Write:
See page 112.
Reset:
Read:
U
U
Port D Data Direction Register
DDRD5
0
DDRD4
0
DDRD3
0
DDRD2
0
DDRD1 DDRD0
(DDRD) Write:
See page 113.
Reset:
Read:
0
0
0
0
Port E Data Register
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
(PORTE) Write:
See page 113.
Reset:
Read:
Indeterminate after reset
Timer Compare Force Register
FOC1
0
FOC2
0
FOC3
0
FOC4
0
FOC5
0
(CFORC) Write:
See page 151.
Reset:
Read:
0
0
0
0
0
0
Output Compare 1 Mask Register
OC1M7 OC1M6
OC1M5
0
OC1M4
0
OC1M3
0
(OC1M) Write:
See page 152.
Reset:
Read:
0
0
Output Compare 1 Data Register
OC1D7 OC1D6
OC1D5
OC1D4
OC1D3
(OC1D) Write:
See page 152.
Reset:
Read: Bit 15
(TCNTH) Write:
0
0
0
0
0
0
0
0
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Timer Counter Register High
See page 153.
Reset:
0
0
0
0
0
0
0
0
Read: Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Timer Counter Register Low
(TCNTL) Write:
See page 153.
Reset:
Read:
0
0
0
0
0
0
0
0
Timer Input Capture 1 Register
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
High (TIC1H) Write:
See page 147.
Reset:
Indeterminate after reset
Bit 4 Bit 3
Read:
Timer Input Capture 1 Register
Bit 7
Bit 6
Bit 5
Bit 2
Bit 1
Bit 0
Low (TIC1L) Write:
See page 147.
Reset:
Indeterminate after reset
= Reserved
= Unimplemented
I = Indeterminate after reset
R
U = Unaffected
Figure 2-7. Register and Control Bit Assignments (Sheet 2 of 6)
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
39
Operating Modes and On-Chip Memory
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Operating Modes and On-Chip Memory
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Timer Input Capture 2 Register
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
$1012
High (TIC2H) Write:
See page 147.
Reset:
Indeterminate after reset
Bit 4 Bit 3
Indeterminate after reset
Bit 12 Bit 11
Indeterminate after reset
Bit 4 Bit 3
Indeterminate after reset
Read:
TImer Input Capture 2 Register
Bit 7
Bit 15
Bit 7
Bit 6
Bit 14
Bit 6
Bit 5
Bit 13
Bit 5
Bit 2
Bit 10
Bit 2
Bit 1
Bit 9
Bit 1
Bit 0
Bit 8
Bit 0
$1013
$1014
$1015
$1016
$1017
$1018
$1019
$101A
$101B
$101C
$101D
Low (TIC2L) Write:
See page 147.
Reset:
Read:
Timer Input Capture 3 Register
High (TIC3H) Write:
See page 147.
Reset:
Read:
Timer Input Capture 3 Register
Low (TIC3L) Write:
See page 147.
Reset:
Read:
Timer Output Compare 1 Register
Bit 15
1
Bit 14
1
Bit 13
1
Bit 12
1
Bit 11
1
Bit 10
1
Bit 9
1
Bit 8
1
High (TOC1H) Write:
See page 149.
Reset:
Read:
Timer Output Compare 1 Register
Bit 7
1
Bit 6
1
Bit 5
1
Bit 4
1
Bit 3
1
Bit 2
1
Bit 1
1
Bit 0
1
Low (TOC1L) Write:
See page 149.
Reset:
Read:
Timer Output Compare 2 Register
Bit 15
1
Bit 14
1
Bit 13
1
Bit 12
1
Bit 11
1
Bit 10
1
Bit 9
1
Bit 8
1
High (TOC2H) Write:
See page 150.
Reset:
Read:
Timer Output Compare 2 Register
Bit 7
1
Bit 6
1
Bit 5
1
Bit 4
1
Bit 3
1
Bit 2
1
Bit 1
1
Bit 0
1
Low (TOC2L) Write:
See page 150.
Reset:
Read:
Timer Output Compare 3 Register
Bit 15
1
Bit 14
1
Bit 13
1
Bit 12
1
Bit 11
1
Bit 10
1
Bit 9
1
Bit 8
1
High (TOC3H) Write:
See page 150.
Reset:
Read:
Timer Output Compare 3 Register
Bit 7
1
Bit 6
1
Bit 5
1
Bit 4
1
Bit 3
1
Bit 2
1
Bit 1
1
Bit 0
1
Low (TOC3L) Write:
See page 150.
Reset:
Read:
Timer Output Compare 4 Register
Bit 15
1
Bit 14
1
Bit 13
1
Bit 12
1
Bit 11
1
Bit 10
1
Bit 9
1
Bit 8
1
High (TOC4H) Write:
See page 150.
Reset:
Read:
Timer Output Compare 4 Register
Bit 7
1
Bit 6
1
Bit 5
1
Bit 4
Bit 3
Bit 2
1
Bit 1
1
Bit 0
1
Low (TOC4L) Write:
See page 150.
Reset:
1
1
= Unimplemented
I = Indeterminate after reset
R
= Reserved
U = Unaffected
Figure 2-7. Register and Control Bit Assignments (Sheet 3 of 6)
Data Sheet
40
M68HC11E Family — Rev. 5
MOTOROLA
Operating Modes and On-Chip Memory
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Operating Modes and On-Chip Memory
Memory Map
Addr.
Register Name
Bit 7
Bit 15
1
6
Bit 14
1
5
Bit 13
1
4
Bit 12
1
3
Bit 11
1
2
Bit 10
1
1
Bit 0
Bit 8
1
Read:
Timer Input Capture 4/Output
Compare 5 Register High Write:
Bit 9
1
$101E
(TI4/O5) See page 148.
Reset:
Read:
Timer Input Capture 4/Output
Compare 5 Register Low Write:
Bit 7
1
Bit 6
1
Bit 5
1
Bit 4
1
Bit 3
1
Bit 2
1
Bit 1
1
Bit 0
1
$101F
$1020
$1021
$1022
$1023
$1024
$1025
$1026
$1027
$1028
$1029
(TI4/O5) See page 148.
Reset:
Read:
Timer Control Register 1
OM2
0
OL2
0
OM3
0
OL3
0
OM4
0
OL4
0
OM5
0
OL5
0
(TCTL1) Write:
See page 153.
Reset:
Read:
Timer Control Register 2
EDG4B EDG4A
EDG1B
0
EDG1A
0
EDG2B
0
EDG2A
0
EDG3B EDG3A
(TCTL2) Write:
See page 146.
Reset:
0
OC1I
0
0
OC2I
0
0
IC2I
0
0
IC3I
0
Read:
Timer Interrupt Mask 1 Register
OC3I
0
OC4I
0
I4/O5I
0
IC1I
0
(TMSK1) Write:
See page 154.
Reset:
Read:
Timer Interrupt Flag 1
OC1F
0
OC2F
0
OC3F
0
OC4F
0
I4/O5F
0
IC1F
0
IC2F
0
IC3F
0
(TFLG1) Write:
See page 154.
Reset:
Read:
Timer Interrupt Mask 2 Register
TOI
0
RTII
0
PAOVI
0
PAII
0
PR1
0
PR0
0
(TMSK2) Write:
See page 155.
Reset:
0
0
Read:
Timer Interrupt Flag 2
TOF
0
RTIF
0
PAOVF
0
PAIF
0
(TFLG2) Write:
See page 158.
Reset:
0
DDRA3
0
0
0
0
Read:
Pulse Accumulator Control
DDRA7
0
PAEN
0
PAMOD
0
PEDGE
0
I4/O5
0
RTR1
0
RTR0
0
Register (PACTL) Write:
See page 159.
Reset:
Read:
Pulse Accumulator Count
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Register (PACNT) Write:
See page 162.
Reset:
Indeterminate after reset
Read:
Serial Peripheral Control Register
SPIE
0
SPE
DWOM
0
MSTR
0
CPOL
0
CPHA
1
SPR1
U
SPR0
U
(SPCR) Write:
See page 138.
Reset:
0
WCOL
0
Read:
Serial Peripheral Status Register
SPIF
0
MODF
(SPSR) Write:
See page 139.
Reset:
0
0
0
0
0
0
= Unimplemented
I = Indeterminate after reset
R
= Reserved
U = Unaffected
Figure 2-7. Register and Control Bit Assignments (Sheet 4 of 6)
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
41
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Operating Modes and On-Chip Memory
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Serial Peripheral Data I/O
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
$102A
Register (SPDR) Write:
See page 140.
Reset:
Indeterminate after reset
Read:
Baud Rate Register
TCLR
SCP2(1)
SCP1
0
SCP0
RCKB
SCR2
U
SCR1
U
SCR0
U
$102B
$102C
$102D
$102E
(BAUD) Write:
See page 126.
Reset:
0
R8
I
0
T8
I
0
M
0
WAKE
0
Read:
Serial Communications Control
Register 1 (SCCR1) Write:
See page 123.
Reset:
0
RIE
0
0
0
RE
0
0
RWU
0
0
SBK
0
Read:
Serial Communications Control
TIE
0
TCIE
0
ILIE
0
TE
0
Register 2 (SCCR2) Write:
See page 124.
Reset:
Read:
Serial Communications Status
TDRE
1
TC
1
RDRF
0
IDLE
0
OR
0
NF
0
FE
0
Register (SCSR) Write:
See page 125.
Reset:
0
1. SCP2 adds ÷39 to SCI prescaler and is present only in MC68HC(7)11E20.
Read:
Serial Communications Data
R7/T7
R6/T6
R5/T5
R4/T4
R3/T3
R2/T2
CC
R1/T1
R0/T0
$102F
$1030
$1031
$1032
$1033
$1034
$1035
Register (SCDR) Write:
See page 122.
Reset:
Indeterminate after reset
Read: CCF
Register (ADCTL) Write:
See page 69.
Analog-to-Digital Control Status
SCAN
MULT
CD
CB
CA
Reset:
0
0
Indeterminate after reset
Read: Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 2
Bit 2
Bit 2
Bit 1
Bit 0
Analog-to-Digital Results
Register 1 (ADR1) Write:
See page 71.
Reset:
Indeterminate after reset
Bit 4 Bit 3
Read: Bit 7
Bit 6
Bit 6
Bit 6
Bit 5
Bit 5
Bit 5
Bit 1
Bit 1
Bit 1
Bit 0
Bit 0
Bit 0
Analog-to-Digital Results
Register 2 (ADR2) Write:
See page 71.
Reset:
Indeterminate after reset
Bit 4 Bit 3
Read: Bit 7
Analog-to-Digital Results
Register 3 (ADR3) Write:
See page 71.
Reset:
Indeterminate after reset
Bit 4 Bit 3
Read: Bit 7
Analog-to-Digital Results
Register 4 (ADR4) Write:
See page 71.
Reset:
Read:
Indeterminate after reset
Block Protect Register
PTCON
BPRT3
BPRT2
1
BPRT1
1
BPRT0
1
(BPROT) Write:
See page 58.
Reset:
0
0
0
1
1
= Unimplemented
I = Indeterminate after reset
R
= Reserved
U = Unaffected
Figure 2-7. Register and Control Bit Assignments (Sheet 5 of 6)
Data Sheet
42
M68HC11E Family — Rev. 5
MOTOROLA
Operating Modes and On-Chip Memory
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Operating Modes and On-Chip Memory
Memory Map
Addr.
$1036
$1037
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
Read:
EPROM Programming Control
MBE
ELAT
EXCOL
EXROW
T1
T0
PGM
Register (EPROG)(1) Write:
See page 59.
Reset:
0
0
0
0
0
0
0
0
Reserved
R
R
R
R
R
R
R
R
1. MC68HC711E20 only
$1038
Reserved
R
R
R
R
R
R
R
R
Read:
System Configuration Options
ADPU
CSEL
0
IRQE(1)
DLY(1)
CME
0
CR1(1)
0
CR0(1)
0
$1039
$103A
$103B
Register (OPTION) Write:
See page 51.
Reset:
0
Bit 7
0
0
Bit 5
0
1
Bit 4
0
0
Bit 2
0
Read:
Arm/Reset COP Timer Circuitry
Bit 6
0
Bit 3
0
Bit 1
0
Bit 0
0
Register (COPRST) Write:
See page 91.
Reset:
Read:
EPROM and EEPROM
Programming Control Register Write:
ODD
0
EVEN
0
ELAT(2)
0
BYTE
0
ROW
0
ERASE
0
EELAT
0
EPGM
0
(PPROG) See page 54.
Reset:
Read:
Highest Priority I Bit Interrupt and
$103C Miscellaneous Register (HPRIO) Write:
RBOOT
0
SMOD
0
MDA
0
IRV(NE)
0
PSEL3
0
PSEL2
1
PSEL1
1
PSEL0
0
See page 46.
Reset:
Read:
RAM and I/O Mapping Register
RAM3
RAM2
RAM1
RAM0
REG3
REG2
REG1
REG0
$103D
$103E
(INIT) Write:
See page 50.
Reset:
0
0
0
0
0
0
0
1
Reserved
R
R
R
R
R
R
R
R
Read:
System Configuration Register
NOSEC
NOCOP ROMON
EEON
U
$103F
$103F
(CONFIG) Write:
See page 48.
Reset:
0
EE3
1
0
EE2
1
0
EE1
1
0
EE0
1
U
NOSEC
U
U
NOCOP
U
1
Read:
System Configuration Register
EEON
1
(CONFIG)(3) Write:
See page 48.
Reset:
1
1. Can be written only once in first 64 cycles out of reset in normal modes or at any time during special modes.
2. MC68HC711E9 only
3. MC68HC811E2 only
= Unimplemented
R
= Reserved
U = Unaffected
I = Indeterminate after reset
Figure 2-7. Register and Control Bit Assignments (Sheet 6 of 6)
M68HC11E Family — Rev. 5
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2.3.1 RAM and Input/Output Mapping
Hardware priority is built into RAM and I/O mapping. Registers have priority over
RAM and RAM has priority over ROM. When a lower priority resource is mapped
at the same location as a higher priority resource, a read/write of a location results
in a read/write of the higher priority resource only. For example, if both the register
block and the RAM are mapped to the same location, only the register block will be
accessed. If RAM and ROM are located at the same position, RAM has priority.
The fully static RAM can be used to store instructions, variables, and temporary
data. The direct addressing mode can access RAM locations using a 1-byte
address operand, saving program memory space and execution time, depending
on the application.
RAM contents can be preserved during periods of processor inactivity by two
methods, both of which reduce power consumption. They are:
1. In the software-based stop mode, the clocks are stopped while VDD powers
the MCU. Because power supply current is directly related to operating
frequency in CMOS integrated circuits, only a very small amount of leakage
exists when the clocks are stopped.
2. In the second method, the MODB/VSTBY pin can supply RAM power from a
battery backup or from a second power supply. Figure 2-8 shows a typical
standby voltage circuit for a standard 5-volt device. Adjustments to the
circuit must be made for devices that operate at lower voltages. Using the
MODB/VSTBY pin may require external hardware, but can be justified when
a significant amount of external circuitry is operating from VDD. If VSTBY is
used to maintain RAM contents, reset must be held low whenever VDD is
below normal operating level. Refer to Section 5. Resets and Interrupts.
VDD
MAX
690
VDD
4.7 k
TO MODB/VSTBY
VOUT
OF M68HC11
VBATT
4.8-V
NiCd
+
Figure 2-8. RAM Standby MODB/VSTBY Connections
The bootloader program is contained in the internal bootstrap ROM. This ROM,
which appears as internal memory space at locations $BF00–$BFFF, is enabled
only if the MCU is reset in special bootstrap mode.
Data Sheet
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Memory Map
In expanded modes, the ROM/EPROM/OTPROM (if present) is enabled out of
reset and located at the top of the memory map if the ROMON bit in the CONFIG
register is set. ROM or EPROM is enabled out of reset in single-chip and bootstrap
modes, regardless of the state of ROMON.
For devices with 512 bytes of EEPROM, the EEPROM is located at $B600–$B7FF
and has the same read cycle time as the internal ROM. The 512 bytes of EEPROM
cannot be remapped to other locations.
For the MC68HC811E2, EEPROM is located at $F800–$FFFF and can be
remapped to any 4-Kbyte boundary. EEPROM mapping control bits (EE[3:0] in
CONFIG) determine the location of the 2048 bytes of EEPROM and are present
only on the MC68HC811E2. Refer to 2.3.3.1 System Configuration Register for
a description of the MC68HC811E2 CONFIG register.
EEPROM can be programmed or erased by software and an on-chip charge pump,
allowing EEPROM changes using the single VDD supply.
2.3.2 Mode Selection
The four mode variations are selected by the logic states of the MODA and MODB
pins during reset. The MODA and MODB logic levels determine the logic state of
SMOD and the MDA control bits in the highest priority I-bit interrupt and
miscellaneous (HPRIO) register.
After reset is released, the mode select pins no longer influence the MCU operating
mode. In single-chip operating mode, the MODA pin is connected to a logic level 0.
In expanded mode, MODA is normally connected to VDD through a pullup resistor
of 4.7 kΩ. The MODA pin also functions as the load instruction register LIR pin
when the MCU is not in reset. The open-drain active low LIR output pin drives low
during the first E cycle of each instruction. The MODB pin also functions as standby
power input (VSTBY), which allows RAM contents to be maintained in absence of
VDD
.
Refer to Table 2-1, which is a summary of mode pin operation, the mode control
bits, and the four operating modes.
Table 2-1. Hardware Mode Select Summary
Input Levels
at Reset
Control Bits in HPRIO
(Latched at Reset)
Mode
MODB
MODA
RBOOT
SMOD
MDA
1
1
0
0
0
1
0
1
Single chip
Expanded
Bootstrap
0
0
1
0
0
0
1
1
0
1
0
1
Special test
M68HC11E Family — Rev. 5
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A normal mode is selected when MODB is logic 1 during reset. One of three reset
vectors is fetched from address $FFFA–$FFFF, and program execution begins
from the address indicated by this vector. If MODB is logic 0 during reset, the
special mode reset vector is fetched from addresses $BFFA–$BFFF, and software
has access to special test features. Refer to Section 5. Resets and Interrupts.
Address:
$103C
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
RBOOT(1) SMOD(1)
MDA(1)
IRV(NE)(1)
PSEL3
PSEL2
PSEL1
PSEL0
Resets:
Single chip:
Expanded:
Bootstrap:
Test:
0
0
1
0
0
0
1
1
0
1
0
1
0
0
0
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1. The reset values depend on the mode selected at the RESET pin rising edge.
Figure 2-9. Highest Priority I-Bit Interrupt and Miscellaneous
Register (HPRIO)
RBOOT — Read Bootstrap ROM Bit
Valid only when SMOD is set (bootstrap or special test mode); can be written
only in special modes
0 = Bootloader ROM disabled and not in map
1 = Bootloader ROM enabled and in map at $BE00–$BFFF
SMOD and MDA — Special Mode Select and Mode Select A Bits
The initial value of SMOD is the inverse of the logic level present on the MODB
pin at the rising edge of reset. The initial value of MDA equals the logic level
present on the MODA pin at the rising edge of reset. These two bits can be read
at any time. They can be written anytime in special modes. MDA can be written
only once in normal modes. SMOD cannot be set once it has been cleared.
Input
Latched at Reset
Mode
MODB
MODA
SMOD
MDA
1
1
0
0
0
1
0
1
Single chip
Expanded
Bootstrap
0
0
1
1
0
1
0
1
Special test
Data Sheet
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M68HC11E Family — Rev. 5
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Memory Map
IRV(NE) — Internal Read Visibility (Not E) Bit
IRVNE can be written once in any mode. In expanded modes, IRVNE
determines whether IRV is on or off. In special test mode, IRVNE is reset to 1.
In all other modes, IRVNE is reset to 0. For the MC68HC811E2, this bit is IRV
and only controls the internal read visibility function.
0 = No internal read visibility on external bus
1 = Data from internal reads is driven out the external data bus.
In single-chip modes this bit determines whether the E clock drives out from the
chip. For the MC68HC811E2, this bit has no meaning or effect in single-chip and
bootstrap modes.
0 = E is driven out from the chip.
1 = E pin is driven low. Refer to the following table.
IRVNE Out
of Reset
E Clock Out
of Reset
IRV Out
of Reset
IRVNE
Affects Only
IRVNE Can
Be Written
Mode
Single chip
Expanded
Bootstrap
0
0
0
1
On
On
On
On
Off
Off
Off
On
E
Once
Once
Once
Once
IRV
E
Special test
IRV
PSEL[3:0] — Priority Select Bits
Refer to Section 5. Resets and Interrupts.
2.3.3 System Initialization
Registers and bits that control initialization and the basic operation of the MCU are
protected against writes except under special circumstances. Table 2-2 lists
registers that can be written only once after reset or that must be written within the
first 64 cycles after reset.
Table 2-2. Write Access Limited Registers
Operating Register
Must be Written
in First 64 Cycles
Write
Anytime
Register Name
Mode
Address
SMOD = 0
$x024 Timer interrupt mask 2 (TMSK2)
$x035 Block protect register (BPROT)
$x039 System configuration options (OPTION)
Bits [1:0], once only
Clear bits, once only
Bits [5:4], bits [2:0], once only Bits [7:6], bit 3
Bits [7:2]
Set bits only
Highest priority I-bit interrupt
$x03C
See HPRIO description
See HPRIO description
and miscellaneous (HPRIO)
$x03D RAM and I/O map register (INIT)
$x024 Timer interrupt mask 2 (TMSK2)
$x035 Block protect register (BPROT)
$x039 System configuration options (OPTION)
Yes, once only
—
All, set or clear
All, set or clear
All, set or clear
SMOD = 1
—
—
—
Highest priority I-bit interrupt and
$x03C
See HPRIO description
—
See HPRIO description
All, set or clear
miscellaneous (HPRIO)
$x03D RAM and I/O map register (INIT)
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2.3.3.1 System Configuration Register
The system configuration register (CONFIG) consists of an EEPROM byte and
static latches that control the startup configuration of the MCU. The contents of the
EEPROM byte are transferred into static working latches during reset sequences.
The operation of the MCU is controlled directly by these latches and not by
CONFIG itself. In normal modes, changes to CONFIG do not affect operation of the
MCU until after the next reset sequence. When programming, the CONFIG register
itself is accessed. When the CONFIG register is read, the static latches are
accessed. See 2.5.1 EEPROM and CONFIG Programming and Erasure for
information on modifying CONFIG.
To take full advantage of the MCU’s functionality, customers can program the
CONFIG register in bootstrap mode. This can be accomplished by setting the
mode pins to logic 0 and downloading a small program to internal RAM. For more
information, Motorola application note AN1060 entitled M68HC11 Bootstrap
Mode has been included at the back of this document. The downloadable talker
will consist of:
•
•
•
Bulk erase
Byte programming
Communication server
All of this functionality is provided by PCbug11 which can be found on the Motorola
Web site at http://www.motorola.com/semiconductors/. For more information
on using PCbug11 to program an E-series device, Motorola engineering bulletin
EB296 entitled Programming MC68HC711E9 Devices with PCbug11 and the
M68HC11EVBU has been included at the back of this document.
NOTE:
The CONFIG register on the 68HC11 is an EEPROM cell and must be
programmed accordingly.
Operation of the CONFIG register in the MC68HC811E2 differs from other devices
in the M68HC11 E series. See Figure 2-10 and Figure 2-11.
Address: $103F
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
NOSEC
NOCOP
ROMON
EEON
Resets:
Single chip:
Bootstrap:
Expanded:
Test:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
U
U
1
U
1
U
U
U
U
U
U
U
U(L)
U
1
U(L)
= Unimplemented
U indicates a previously programmed bit. U(L) indicates that the bit resets to the logic level held in the latch prior to reset,
but the function of COP is controlled by the DISR bit in TEST1 register.
Figure 2-10. System Configuration Register (CONFIG)
Data Sheet
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Memory Map
Address:
$103F
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
EE3
EE2
EE1
EE0
NOSEC
NOCOP
EEON
Resets:
Single chip:
Bootstrap:
Expanded:
Test:
1
1
1
1
1
1
1
1
U
U
1
U
1
1
1
1
1
1
U(L)
U
U
U
U
U
U
U
U
U
U
0
1
U(L)
= Unimplemented
U indicates a previously programmed bit. U(L) indicates that the bit resets to the logic level held in the latch prior to reset,
but the function of COP is controlled by the DISR bit in TEST1 register.
Figure 2-11. MC68HC811E2 System Configuration Register (CONFIG)
EE[3:0] — EEPROM Mapping Bits
EE[3:0] apply only to MC68HC811E2 and allow the 2048 bytes of EEPROM to
be remapped to any 4-Kbyte boundary. See Table 2-3.
Table 2-3. EEPROM Mapping
EE[3:0]
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
EEPROM Location
$0800–$0FFF
$1800–$1FFF
$2800–$2FFF
$3800–$3FFF
$4800–$4FFF
$5800–$5FFF
$6800–$6FFF
$7800–$7FFF
$8800–$8FFF
$9800–$9FFF
$A800–$AFFF
$B800–$BFFF
$C800–$CFFF
$D800–$DFFF
$E800–$EFFF
$F800–$FFFF
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NOSEC — Security Disable Bit
NOSEC is invalid unless the security mask option is specified before the MCU
is manufactured. If the security mask option is omitted NOSEC always reads 1.
The enhanced security feature is available in the MC68S711E9 MCU. The
enhancement to the standard security feature protects the EPROM as well as
RAM and EEPROM.
0 = Security enabled
1 = Security disabled
NOCOP — COP System Disable Bit
Refer to Section 5. Resets and Interrupts.
1 = COP disabled
0 = COP enabled
ROMON — ROM/EPROM/OTPROM Enable Bit
When this bit is 0, the ROM or EPROM is disabled and that memory space
becomes externally addressed. In single-chip mode, ROMON is forced to 1 to
enable ROM/EPROM regardless of the state of the ROMON bit.
0 = ROM disabled from the memory map
1 = ROM present in the memory map
EEON — EEPROM Enable Bit
When this bit is 0, the EEPROM is disabled and that memory space becomes
externally addressed.
0 = EEPROM removed from the memory map
1 = EEPROM present in the memory map
2.3.3.2 RAM and I/O Mapping Register
The internal registers used to control the operation of the MCU can be relocated
on 4-Kbyte boundaries within the memory space with the use of the RAM and I/O
mapping register (INIT). This 8-bit special-purpose register can change the default
locations of the RAM and control registers within the MCU memory map. It can be
written only once within the first 64 E-clock cycles after a reset in normal modes,
and then it becomes a read-only register.
Address: $103D
Bit 7
RAM3
0
6
RAM2
0
5
RAM1
0
4
RAM0
0
3
REG3
0
2
REG2
0
1
REG1
0
Bit 0
REG0
1
Read:
Write:
Reset:
Figure 2-12. RAM and I/O Mapping Register (INIT)
RAM[3:0] — RAM Map Position Bits
These four bits, which specify the upper hexadecimal digit of the RAM address,
control position of RAM in the memory map. RAM can be positioned at the
beginning of any 4-Kbyte page in the memory map. It is initialized to address
$0000 out of reset. Refer to Table 2-4.
Data Sheet
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Memory Map
REG[3:0] — 64-Byte Register Block Position
These four bits specify the upper hexadecimal digit of the address for the
64-byte block of internal registers. The register block, positioned at the
beginning of any 4-Kbyte page in the memory map, is initialized to address
$1000 out of reset. Refer to Table 2-5.
Table 2-4. RAM Mapping
Table 2-5. Register Mapping
RAM[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Address
REG[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Address
$0000–$0xFF
$1000–$1xFF
$2000–$2xFF
$3000–$3xFF
$4000–$4xFF
$5000–$5xFF
$6000–$6xFF
$7000–$7xFF
$8000–$8xFF
$9000–$9xFF
$A000–$AxFF
$B000–$BxFF
$C000–$CxFF
$D000–$DxFF
$E000–$ExFF
$F000–$FxFF
$0000–$003F
$1000–$103F
$2000–$203F
$3000–$303F
$4000–$403F
$5000–$503F
$6000–$603F
$7000–$703F
$8000–$803F
$9000–$903F
$A000–$A03F
$B000–$B03F
$C000–$C03F
$D000–$D03F
$E000–$E03F
$F000–$F03F
2.3.3.3 System Configuration Options Register
The 8-bit, special-purpose system configuration options register (OPTION) sets
internal system configuration options during initialization. The time protected
control bits, IRQE, DLY, and CR[1:0], can be written only once after a reset and
then they become read-only. This minimizes the possibility of any accidental
changes to the system configuration.
Address: $1039
Bit 7
ADPU
0
6
CSEL
0
5
IRQE(1)
0
4
DLY(1)
1
3
CME
0
2
1
CR1(1)
0
Bit 0
CR0(1)
0
Read:
Write:
Reset:
0
1. Can be written only once in first 64 cycles out of reset in normal modes or at any time during
special modes.
= Unimplemented
Figure 2-13. System Configuration Options Register (OPTION)
M68HC11E Family — Rev. 5
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ADPU — Analog-to-Digital Converter Power-Up Bit
Refer to Section 3. Analog-to-Digital (A/D) Converter.
CSEL — Clock Select Bit
Selects alternate clock source for on-chip EEPROM charge pump. Refer to
2.5.1 EEPROM and CONFIG Programming and Erasure for more information
on EEPROM use.
CSEL also selects the clock source for the A/D converter, a function discussed
in Section 3. Analog-to-Digital (A/D) Converter.
IRQE — Configure IRQ for Edge-Sensitive Only Operation Bit
Refer to Section 5. Resets and Interrupts.
DLY — Enable Oscillator Startup Delay Bit
0 = The oscillator startup delay coming out of stop mode is bypassed and the
MCU resumes processing within about four bus cycles.
1 = A delay of approximately 4000 E-clock cycles is imposed as the MCU is
started up from the stop power-saving mode. This delay allows the
crystal oscillator to stabilize.
CME — Clock Monitor Enable Bit
Refer to Section 5. Resets and Interrupts.
Bit 2 — Not implemented
Always reads 0
CR[1:0] — COP Timer Rate Select Bits
The internal E clock is divided by 215 before it enters the COP watchdog system.
These control bits determine a scaling factor for the watchdog timer. Refer to
Section 5. Resets and Interrupts.
2.4 EPROM/OTPROM
Certain devices in the M68HC11 E series include on-chip EPROM/OTPROM. For
instance:
•
•
•
The MC68HC711E9 devices contain 12 Kbytes of on-chip EPROM
(OTPROM in non-windowed package).
The MC68HC711E20 has 20 Kbytes of EPROM (OTPROM in
non-windowed package).
The MC68HC711E32 has 32 Kbytes of EPROM (OTPROM in
non-windowed package).
Standard MC68HC71E9 and MC68HC711E20 devices are shipped with the
EPROM/OTPROM contents erased (all 1s). The programming operation programs
zeros. Windowed devices must be erased using a suitable ultraviolet light source
before reprogramming. Depending on the light source, erasing can take from 15 to
45 minutes.
Data Sheet
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EPROM/OTPROM
Using the on-chip EPROM/OTPROM programming feature requires an external
12-volt nominal power supply (VPPE). Normal programming is accomplished using
the EPROM/OTPROM programming register (PPROG).
PPROG is the combined EPROM/OTPROM and EEPROM programming register
on all devices with EPROM/OTPROM except the MC68HC711E20. For the
MC68HC711E20, there is a separate register for EPROM/OTPROM programming
called the EPROG register.
As described in the following subsections, these two methods of programming and
verifying EPROM are possible:
1. Programming an individual EPROM address
2. Programming the EPROM with downloaded data
2.4.1 Programming an Individual EPROM Address
In this method, the MCU programs its own EPROM by controlling the PPROG
register (EPROG in MC68HC711E20). Use these procedures to program the
EPROM through the MCU with:
•
•
•
The ROMON bit set in the CONFIG register
The 12-volt nominal programming voltage present on the XIRQ/VPPE pin
The IRQ pin must be pulled high.
NOTE:
Any operating mode can be used.
This example applies to all devices with EPROM/OTPROM except for the
MC68HC711E20.
EPROG
LDAB
STAB
#$20
$103B Set ELAT bit in (EPGM = 0) to enable
EPROM latches.
STAA
LDAB
STAB
$0,X
#$21
Store data to EPROM address
$103B Set EPGM bit with ELAT = 1 to enable
EPROM programming voltage
JSR
CLR
DLYEP Delay 2–4 ms
$103B Turn off programming voltage and set
to READ mode
This example applies only to MC68HC711E20.
EPROG
LDAB
STAB
#$20
$1036 Set ELAT bit (EPGM = 0) to enable
EPROM latches.
STAA
LDAB
STAB
$0,X
#$21
Store data to EPROM address
$1036 Set EPGM bit with ELAT = 1 to enable
EPROM programming voltage
JSR
CLR
DLYEP Delay 2–4 ms
$1036 Turn off programming voltage and set
to READ mode
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2.4.2 Programming the EPROM with Downloaded Data
When using this method, the EPROM is programmed by software while in the
special test or bootstrap modes. User-developed software can be uploaded
through the SCI or a ROM-resident EPROM programming utility can be used. The
12-volt nominal programming voltage must be present on the XIRQ/VPPE pin. To
use the resident utility, bootload a 3-byte program consisting of a single jump
instruction to $BF00. $BF00 is the starting address of a resident EPROM
programming utility. The utility program sets the X and Y index registers to default
values, then receives programming data from an external host, and puts it in
EPROM. The value in IX determines programming delay time. The value in IY is a
pointer to the first address in EPROM to be programmed (default = $D000).
When the utility program is ready to receive programming data, it sends the host
the $FF character. Then it waits. When the host sees the $FF character, the
EPROM programming data is sent, starting with the first location in the EPROM
array. After the last byte to be programmed is sent and the corresponding
verification data is returned, the programming operation is terminated by resetting
the MCU.
For more information, Motorola application note AN1060 entitled M68HC11
Bootstrap Mode has been included at the back of this document.
2.4.3 EPROM and EEPROM Programming Control Register
The EPROM and EEPROM programming control register (PPROG) enables the
EPROM programming voltage and controls the latching of data to be programmed.
•
For MC68HC711E9, PPROG is also the EEPROM programming control
register.
•
For the MC68HC711E20, EPROM programming is controlled by the
EPROG register and EEPROM programming is controlled by the PPROG
register.
Address: $103B
Bit 7
ODD
0
6
EVEN
0
5
ELAT(1)
0
4
BYTE
0
3
ROW
0
2
ERASE
0
1
EELAT
0
Bit 0
EPGM
0
Read:
Write:
Reset:
1. MC68HC711E9 only
Figure 2-14. EPROM and EEPROM Programming
Control Register (PPROG)
ODD — Program Odd Rows in Half of EEPROM (Test) Bit
Refer to 2.5 EEPROM.
EVEN — Program Even Rows in Half of EEPROM (Test) Bit
Refer to 2.5 EEPROM.
Data Sheet
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EPROM/OTPROM
ELAT — EPROM/OTPROM Latch Control Bit
When ELAT = 1, writes to EPROM cause address and data to be latched and
the EPROM/OTPROM cannot be read. ELAT can be read any time. ELAT can
be written any time except when EPGM = 1; then the write to ELAT is disabled.
0 = EPROM address and data bus configured for normal reads
1 = EPROM address and data bus configured for programming
For the MC68HC711E9:
a. EPGM enables the high voltage necessary for both EEPROM and
EPROM/OTPROM programming.
b. ELAT and EELAT are mutually exclusive and cannot both equal 1.
BYTE — Byte/Other EEPROM Erase Mode Bit
Refer to 2.5 EEPROM.
ROW — Row/All EEPROM Erase Mode Bit
Refer to 2.5 EEPROM.
ERASE — Erase Mode Select Bit
Refer to 2.5 EEPROM.
EELAT — EEPROM Latch Control Bit
Refer to 2.5 EEPROM.
EPGM —EPROM/OTPROM/EEPROM Programming Voltage Enable Bit
EPGM can be read any time and can be written only when ELAT = 1 (for
EPROM/OTPROM programming) or when EELAT = 1 (for EEPROM
programming).
0 = Programming voltage to EPROM/OTPROM/EEPROM array
disconnected
1 = Programming voltage to EPROM/OTPROM/EEPROM array connected
Address: $1036
Bit 7
MBE
0
6
5
ELAT
0
4
EXCOL
0
3
EXROW
0
2
T1
0
1
T0
0
Bit 0
PGM
0
Read:
Write:
Reset:
0
= Unimplemented
Figure 2-15. MC68HC711E20 EPROM Programming
Control Register (EPROG)
MBE — Multiple-Byte Programming Enable Bit
When multiple-byte programming is enabled, address bit 5 is considered a don’t
care so that bytes with address bit 5 = 0 and address bit 5 = 1 both get
programmed. MBE can be read in any mode and always reads 0 in normal
modes. MBE can be written only in special modes.
0 = EPROM array configured for normal programming
1 = Program two bytes with the same data
M68HC11E Family — Rev. 5
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Bit 6 — Unimplemented
Always reads 0
ELAT — EPROM/OTPROM Latch Control Bit
When ELAT = 1, writes to EPROM cause address and data to be latched and
the EPROM/OTPROM cannot be read. ELAT can be read any time. ELAT can
be written any time except when PGM = 1; then the write to ELAT is disabled.
0 = EPROM/OTPROM address and data bus configured for normal reads
1 = EPROM/OTPROM address and data bus configured for programming
EXCOL — Select Extra Columns Bit
0 = User array selected
1 = User array is disabled and extra columns are accessed at bits [7:0].
Addresses use bits [13:5] and bits [4:0] are don’t care. EXCOL can be
read and written only in special modes and always returns 0 in normal
modes.
EXROW — Select Extra Rows Bit
0 = User array selected
1 = User array is disabled and two extra rows are available. Addresses use
bits [7:0] and bits [13:8] are don’t care. EXROW can be read and written
only in special modes and always returns 0 in normal modes.
T[1:0] — EPROM Test Mode Select Bits
These bits allow selection of either gate stress or drain stress test modes. They
can be read and written only in special modes and always read 0 in normal
modes.
T1
0
T0
0
Function Selected
Normal mode
Reserved
0
1
1
0
Gate stress
1
1
Drain stress
PGM — EPROM Programming Voltage Enable Bit
PGM can be read any time and can be written only when ELAT = 1.
0 = Programming voltage to EPROM array disconnected
1 = Programming voltage to EPROM array connected
Data Sheet
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Operating Modes and On-Chip Memory
EEPROM
2.5 EEPROM
Some E-series devices contain 512 bytes of on-chip EEPROM. The
MC68HC811E2 contains 2048 bytes of EEPROM with selectable base address. All
E-series devices contain the EEPROM-based CONFIG register.
2.5.1 EEPROM and CONFIG Programming and Erasure
The erased state of an EEPROM bit is 1. During a read operation, bit lines are
precharged to 1. The floating gate devices of programmed bits conduct and pull the
bit lines to 0. Unprogrammed bits remain at the precharged level and are read as
ones. Programming a bit to 1 causes no change. Programming a bit to 0 changes
the bit so that subsequent reads return 0.
When appropriate bits in the BPROT register are cleared, the PPROG register
controls programming and erasing the EEPROM. The PPROG register can be read
or written at any time, but logic enforces defined programming and erasing
sequences to prevent unintentional changes to EEPROM data. When the EELAT
bit in the PPROG register is cleared, the EEPROM can be read as if it were a ROM.
The on-chip charge pump that generates the EEPROM programming voltage from
VDD uses MOS capacitors, which are relatively small in value. The efficiency of this
charge pump and its drive capability are affected by the level of VDD and the
frequency of the driving clock. The load depends on the number of bits being
programmed or erased and capacitances in the EEPROM array.
The clock source driving the charge pump is software selectable. When the clock
select (CSEL) bit in the OPTION register is 0, the E clock is used; when CSEL is 1,
an on-chip resistor-capacitor (RC) oscillator is used.
The EEPROM programming voltage power supply voltage to the EEPROM array
is not enabled until there has been a write to PPROG with EELAT set and PGM
cleared. This must be followed by a write to a valid EEPROM location or to the
CONFIG address, and then a write to PPROG with both the EELAT and EPGM bits
set. Any attempt to set both EELAT and EPGM during the same write operation
results in neither bit being set.
2.5.1.1 Block Protect Register
This register prevents inadvertent writes to both the CONFIG register and
EEPROM. The active bits in this register are initialized to 1 out of reset and can be
cleared only during the first 64 E-clock cycles after reset in the normal modes.
When these bits are cleared, the associated EEPROM section and the CONFIG
register can be programmed or erased. EEPROM is only visible if the EEON bit in
the CONFIG register is set. The bits in the BPROT register can be written to 1 at
any time to protect EEPROM and the CONFIG register. In test or bootstrap modes,
write protection is inhibited and BPROT can be written repeatedly. Address ranges
for protected areas of EEPROM differ significantly for the MC68HC811E2. Refer to
Figure 2-16.
M68HC11E Family — Rev. 5
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Address: $1035
Bit 7
6
5
0
4
PTCON
1
3
BPRT3
1
2
BPRT2
1
1
BPRT1
1
Bit 0
BPRT0
1
Read:
Write:
Reset:
0
0
= Unimplemented
Figure 2-16. Block Protect Register (BPROT)
Bits [7:5] — Unimplemented
Always read 0
PTCON — Protect CONFIG Register Bit
0 = CONFIG register can be programmed or erased normally.
1 = CONFIG register cannot be programmed or erased.
BPRT[3:0] — Block Protect Bits for EEPROM
When set, these bits protect a block of EEPROM from being programmed or
electronically erased. Ultraviolet light, however, can erase the entire
EEPROM contents regardless of BPRT[3:0] (windowed packages only). Refer
to Table 2-6 and Table 2-7.
When cleared, BPRT[3:0] allow programming and erasure of the associated
block.
Table 2-6. EEPROM Block Protect
Bit Name
BPRT0
BPRT1
BPRT2
BPRT3
Block Protected
$B600–$B61F
$B620–$B65F
$B660–$B6DF
$B6E0–$B7FF
Block Size
32 bytes
64 bytes
128 bytes
288 bytes
Table 2-7. EEPROM Block Protect in MC68HC811E2 MCUs
Bit Name
BPRT0
BPRT1
BPRT2
BPRT3
Block Protected
$x800–$x9FF(1)
$xA00–$xBFF(1)
$xC00–$xDFF(1)
$xE00–$xFFF(1)
Block Size
512 bytes
512 bytes
512 bytes
512 bytes
1. x is determined by the value of EE[3:0] in CONFIG register. Refer to Figure 2-13.
2.5.1.2 EPROM and EEPROM Programming Control Register
The EPROM and EEPROM programming control register (PPROG) selects and
controls the EEPROM programming function. Bits in PPROG enable the
programming voltage, control the latching of data to be programmed, and select
the method of erasure (for example, byte, row, etc.).
Data Sheet
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M68HC11E Family — Rev. 5
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EEPROM
Address: $103B
Bit 7
6
EVEN
0
5
ELAT(1)
0
4
BYTE
0
3
ROW
0
2
ERASE
0
1
EELAT
0
Bit 0
EPGM
0
Read:
Write:
ODD
Reset:
0
1. MC68HC711E9 only
Figure 2-17. EPROM and EEPROM Programming
Control Register (PPROG)
ODD — Program Odd Rows in Half of EEPROM (Test) Bit
EVEN — Program Even Rows in Half of EEPROM (Test) Bit
ELAT — EPROM/OTPROM Latch Control Bit
For the MC68HC711E9, EPGM enables the high voltage necessary for both
EPROM/OTPROM and EEPROM programming.
For MC68HC711E9, ELAT and EELAT are mutually exclusive and cannot both
equal 1.
0 = EPROM address and data bus configured for normal reads
1 = EPROM address and data bus configured for programming
BYTE — Byte/Other EEPROM Erase Mode Bit
This bit overrides the ROW bit.
0 = Row or bulk erase
1 = Erase only one byte
ROW — Row/All EEPROM Erase Mode Bit
If BYTE is 1, ROW has no meaning.
0 = Bulk erase
1 = Row erase
Table 2-8. EEPROM Erase
BYTE
ROW
Action
Bulk erase (entire array)
Row erase (16 bytes)
Byte erase
0
0
1
1
0
1
0
1
Byte erase
ERASE — Erase Mode Select Bit
0 = Normal read or program mode
1 = Erase mode
EELAT — EEPROM Latch Control Bit
0 = EEPROM address and data bus configured for normal reads and cannot
be programmed
1 = EEPROM address and data bus configured for programming or erasing
and cannot be read
M68HC11E Family — Rev. 5
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EPGM — EPROM/OTPROM/EEPROM Programming Voltage Enable Bit
0 = Programming voltage to EEPROM array switched off
1 = Programming voltage to EEPROM array switched on
During EEPROM programming, the ROW and BYTE bits of PPROG are not used.
If the frequency of the E clock is 1 MHz or less, set the CSEL bit in the OPTION
register. Recall that 0s must be erased by a separate erase operation before
programming. The following examples of how to program an EEPROM byte
assume that the appropriate bits in BPROT are cleared.
PROG
LDAB
STAB
STAA
#$02
EELAT = 1
$103B Set EELAT bit
$XXXX Store data to EEPROM address
(for valid EEPROM address see memory
map for each device)
LDAB
STAB
JSR
#$03
EELAT = 1, EPGM = 1
$103B Turn on programming voltage
DLY10 Delay 10 ms
CLR
$103B Turn off high voltage and set
to READ mode
2.5.1.3 EEPROM Bulk Erase
This is an example of how to bulk erase the entire EEPROM. The CONFIG register
is not affected in this example.
BULKE
LDAB
STAB
STAA
#$06
EELAT = 1, ERASE = 1
$103B Set to BULK erase mode
$XXXX Store data to any EEPROM address (for
valid EEPROM address see memory map
for each device)
LDAB
STAB
JSR
#$07
EELAT = 1, EPGM = 1, ERASE = 1
$103B Turn on high voltage
DLY10 Delay 10 ms
CLR
$103B Turn off high voltage and set
to READ mode
2.5.1.4 EEPROM Row Erase
This example shows how to perform a fast erase of large sections of EEPROM.
ROWE
LDAB
STAB
STAB
LDAB
STAB
JSR
#$0E
ROW = 1, ERASE = 1, EELAT = 1
$103B Set to ROW erase mode
0,X
#$0F
Write any data to any address in ROW
ROW = 1, ERASE = 1, EELAT = 1, EPGM = 1
$103B Turn on high voltage
DLY10 Delay 10 ms
CLR
$103B Turn off high voltage and set
to READ mode
Data Sheet
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EEPROM
2.5.1.5 EEPROM Byte Erase
This is an example of how to erase a single byte of EEPROM.
BYTEE
LDAB
STAB
STAB
LDAB
#$16
BYTE = 1, ERASE = 1, EELAT = 1
$103B Set to BYTE erase mode
0,X
#$17
Write any data to address to be erased
BYTE = 1, ERASE = 1, EELAT = 1,
EPGM = 1
STAB
JSR
CLR
$103B Turn on high voltage
DLY10 Delay 10 ms
$103B Turn off high voltage and set
to READ mode
2.5.1.6 CONFIG Register Programming
Because the CONFIG register is implemented with EEPROM cells, use EEPROM
procedures to erase and program this register. The procedure for programming is
the same as for programming a byte in the EEPROM array, except that the
CONFIG register address is used. CONFIG can be programmed or erased
(including byte erase) while the MCU is operating in any mode, provided that
PTCON in BPROT is clear.
To change the value in the CONFIG register, complete this procedure.
1. Erase the CONFIG register.
2. Program the new value to the CONFIG address.
3. Initiate reset.
NOTE:
Do not initiate a reset until the procedure is complete.
2.5.2 EEPROM Security
The optional security feature, available only on ROM-based MCUs, protects the
EEPROM and RAM contents from unauthorized access. A program, or a key
portion of a program, can be protected against unauthorized duplication. To
accomplish this, the protection mechanism restricts operation of protected devices
to the single-chip modes. This prevents the memory locations from being
monitored externally because single-chip modes do not allow visibility of the
internal address and data buses. Resident programs, however, have unlimited
access to the internal EEPROM and RAM and can read, write, or transfer the
contents of these memories.
An enhanced security feature which protects EPROM contents, RAM, and
EEPROM from unauthorized accesses is available in MC68S711E9. Refer to
Section 11. Ordering Information and Mechanical Specifications for the exact
part number.
M68HC11E Family — Rev. 5
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Data Sheet
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For further information, these engineering bulletins have been included at the back
of this data book:
•
EB183 — Enabling the Security Feature on the MC68HC711E9 Devices
with PCbug11 on the M68HC711E9PGMR
•
EB188 — Enabling the Security Feature on M68HC811E2 Devices with
PCbug11 on the M68HC711E9PGMR
Data Sheet
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M68HC11E Family — Rev. 5
Operating Modes and On-Chip Memory
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Data Sheet — M68HC11E Family
Section 3. Analog-to-Digital (A/D) Converter
3.1 Introduction
3.2 Overview
The analog-to-digital (A/D) system, a successive approximation converter, uses an
all-capacitive charge redistribution technique to convert analog signals to digital
values.
The A/D system is an 8-channel, 8-bit, multiplexed-input converter. The converter
does not require external sample and hold circuits because of the type of charge
redistribution technique used. A/D converter timing can be synchronized to the
system E clock or to an internal resistor capacitor (RC) oscillator.
The A/D converter system consists of four functional blocks: multiplexer, analog
converter, digital control, and result storage. Refer to Figure 3-1.
3.2.1 Multiplexer
The multiplexer selects one of 16 inputs for conversion. Input selection is controlled
by the value of bits CD:CA in the ADCTL register. The eight port E pins are
fixed-direction analog inputs to the multiplexer, and additional internal analog
signal lines are routed to it.
Port E pins also can be used as digital inputs. Digital reads of port E pins are not
recommended during the sample portion of an A/D conversion cycle, when the
gate signal to the N-channel input gate is on. Because no P-channel devices are
directly connected to either input pins or reference voltage pins, voltages above
VDD do not cause a latchup problem, although current should be limited according
to maximum ratings. Refer to Figure 3-2, which is a functional diagram of an
input pin.
M68HC11E Family — Rev. 5
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Analog-to-Digital (A/D) Converter
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Analog-to-Digital (A/D) Converter
PE0
AN0
VRH
8-BIT CAPACITIVE DAC
WITH SAMPLE AND HOLD
VRl
PE1
AN1
PE2
AN2
SUCCESSIVE APPROXIMATION
REGISTER AND CONTROL
PE3
AN3
RESULT
ANALOG
MUX
PE4
AN4
PE5
AN5
INTERNAL
DATA BUS
PE6
AN6
PE7
AN7
ADCTL A/D CONTROL
RESULT REGISTER INTERFACE
ADR1 A/D RESULT 1
ADR2 A/D RESULT 2
ADR3 A/D RESULT 3
ADR4 A/D RESULT 4
Figure 3-1. A/D Converter Block Diagram
DIFFUSION/POLY
COUPLER
ANALOG
INPUT
PIN
*
~ 20 pF
+ ~20 V
– ~0.7 V
+ ~12V
– ~0.7V
ð 4 kΩ
< 2 pF
400 nA
JUNCTION
LEAKAGE
DAC
CAPACITANCE
DUMMY N-CHANNEL
OUTPUT DEVICE
INPUT
PROTECTION
DEVICE
VRL
* THIS ANALOG SWITCH IS CLOSED ONLY DURING THE 12-CYCLE SAMPLE TIME.
Figure 3-2. Electrical Model of an A/D Input Pin (Sample Mode)
Data Sheet
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Analog-to-Digital (A/D) Converter
Overview
3.2.2 Analog Converter
Conversion of an analog input selected by the multiplexer occurs in this block. It
contains a digital-to-analog capacitor (DAC) array, a comparator, and a successive
approximation register (SAR). Each conversion is a sequence of eight comparison
operations, beginning with the most significant bit (MSB). Each comparison
determines the value of a bit in the successive approximation register.
The DAC array performs two functions. It acts as a sample and hold circuit during
the entire conversion sequence and provides comparison voltage to the
comparator during each successive comparison.
The result of each successive comparison is stored in the SAR. When a conversion
sequence is complete, the contents of the SAR are transferred to the appropriate
result register.
A charge pump provides switching voltage to the gates of analog switches in the
multiplexer. Charge pump output must stabilize between 7 and 8 volts within up to
100 µs before the converter can be used. The charge pump is enabled by the
ADPU bit in the OPTION register.
3.2.3 Digital Control
All A/D converter operations are controlled by bits in register ADCTL. In addition to
selecting the analog input to be converted, ADCTL bits indicate conversion status
and control whether single or continuous conversions are performed. Finally, the
ADCTL bits determine whether conversions are performed on single or multiple
channels.
3.2.4 Result Registers
Four 8-bit registers ADR[4:1] store conversion results. Each of these registers can
be accessed by the processor in the CPU. The conversion complete flag (CCF)
indicates when valid data is present in the result registers. The result registers are
written during a portion of the system clock cycle when reads do not occur, so there
is no conflict.
3.2.5 A/D Converter Clocks
The CSEL bit in the OPTION register selects whether the A/D converter uses the
system E clock or an internal RC oscillator for synchronization. When E-clock
frequency is below 750 kHz, charge leakage in the capacitor array can cause
errors, and the internal oscillator should be used. When the RC clock is used,
additional errors can occur because the comparator is sensitive to the additional
system clock noise.
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Analog-to-Digital (A/D) Converter
3.2.6 Conversion Sequence
A/D converter operations are performed in sequences of four conversions each. A
conversion sequence can repeat continuously or stop after one iteration. The
conversion complete flag (CCF) is set after the fourth conversion in a sequence to
show the availability of data in the result registers. Figure 3-3 shows the timing of
a typical sequence. Synchronization is referenced to the system E clock.
E CLOCK
MSB
4
CYCLES
BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB
2
CYC CYC CYC CYC CYC CYC CYC END
2
CYC
2
2
2
2
2
2
12 E CYCLES
SAMPLE ANALOG INPUT
SUCCESSIVE APPROXIMATION SEQUENCE
CONVERT FIRST
CHANNEL, UPDATE
ADR1
CONVERT SECOND
CHANNEL, UPDATE
ADR2
CONVERT THIRD
CHANNEL, UPDATE
ADR3
CONVERT FOURTH
CHANNEL, UPDATE
ADR4
0
32
64
96
128 — E CYCLES
Figure 3-3. A/D Conversion Sequence
3.3 A/D Converter Power-Up and Clock Select
Bit 7 of the OPTION register controls A/D converter power-up. Clearing ADPU
removes power from and disables the A/D converter system. Setting ADPU
enables the A/D converter system. Stabilization of the analog bias voltages
requires a delay of as much as 100 µs after turning on the A/D converter. When the
A/D converter system is operating with the MCU E clock, all switching and
comparator operations are inherently synchronized to the main MCU clocks. This
allows the comparator output to be sampled at relatively quiet times during MCU
clock cycles. Since the internal RC oscillator is asynchronous to the MCU clock,
there is more error attributable to internal system clock noise. A/D converter
accuracy is reduced slightly while the internal RC oscillator is being used
(CSEL = 1).
Address: $1039
Bit 7
ADPU
0
6
CSEL
0
5
IRQE(1)
0
4
DLY(1)
1
3
CME
0
2
0
1
CR1(1)
0
Bit 0
CR0(1)
0
Read:
Write:
Reset:
1. Can be written only once in first 64 cycles out of reset in normal modes or at any time in special modes
= Unimplemented
Figure 3-4. System Configuration Options Register (OPTION)
Data Sheet
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M68HC11E Family — Rev. 5
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Analog-to-Digital (A/D) Converter
Conversion Process
ADPU — A/D Power-Up Bit
0 = A/D powered down
1 = A/D powered up
CSEL — Clock Select Bit
0 = A/D and EEPROM use system E clock.
1 = A/D and EEPROM use internal RC clock.
IRQE — Configure IRQ for Edge-Sensitive Only Operation
Refer to Section 5. Resets and Interrupts.
DLY — Enable Oscillator Startup Delay Bit
0 = The oscillator startup delay coming out of stop is bypassed and the MCU
resumes processing within about four bus cycles.
1 = A delay of approximately 4000 E-clock cycles is imposed as the MCU is
started up from the stop power-saving mode. This delay allows the
crystal oscillator to stabilize.
CME — Clock Monitor Enable Bit
Refer to Section 5. Resets and Interrupts.
Bit 2 — Not implemented
Always reads 0
CR[1:0] — COP Timer Rate Select Bits
Refer to Section 5. Resets and Interrupts and Section 9. Timing System.
3.4 Conversion Process
The A/D conversion sequence begins one E-clock cycle after a write to the A/D
control/status register, ADCTL. The bits in ADCTL select the channel and the mode
of conversion.
An input voltage equal to VRL converts to $00 and an input voltage equal to VRH
converts to $FF (full scale), with no overflow indication. For ratiometric conversions
of this type, the source of each analog input should use VRH as the supply voltage
and be referenced to VRL.
3.5 Channel Assignments
The multiplexer allows the A/D converter to select one of 16 analog signals. Eight
of these channels correspond to port E input lines to the MCU, four of the channels
are internal reference points or test functions, and four channels are reserved.
Refer to Table 3-1.
M68HC11E Family — Rev. 5
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Analog-to-Digital (A/D) Converter
Table 3-1. Converter Channel Assignments
Channel
Number
Channel
Signal
Result in ADRx
if MULT = 1
1
AN0
AN1
ADR1
ADR2
ADR3
ADR4
ADR1
ADR2
ADR3
ADR4
—
2
3
AN2
4
AN3
5
AN4
6
AN5
7
8
AN6
AN7
9 – 12
Reserved
(1)
13
ADR1
ADR2
ADR3
ADR4
VRH
(1)
14
VRL
(VRH)/2(1)
15
Reserved(1)
16
1. Used for factory testing
3.6 Single-Channel Operation
The two types of single-channel operation are:
1. When SCAN = 0, the single selected channel is converted four consecutive
times. The first result is stored in A/D result register 1 (ADR1), and the fourth
result is stored in ADR4. After the fourth conversion is complete, all
conversion activity is halted until a new conversion command is written to
the ADCTL register.
2. When SCAN = 1, conversions continue to be performed on the selected
channel with the fifth conversion being stored in register ADR1 (overwriting
the first conversion result), the sixth conversion overwriting ADR2, and so
on.
3.7 Multiple-Channel Operation
The two types of multiple-channel operation are:
1. When SCAN = 0, a selected group of four channels is converted one time
each. The first result is stored in A/D result register 1 (ADR1), and the fourth
result is stored in ADR4. After the fourth conversion is complete, all
conversion activity is halted until a new conversion command is written to
the ADCTL register.
2. When SCAN = 1, conversions continue to be performed on the selected
group of channels with the fifth conversion being stored in register ADR1
(replacing the earlier conversion result for the first channel in the group), the
sixth conversion overwriting ADR2, and so on.
Data Sheet
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M68HC11E Family — Rev. 5
Analog-to-Digital (A/D) Converter
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Analog-to-Digital (A/D) Converter
Operation in Stop and Wait Modes
3.8 Operation in Stop and Wait Modes
If a conversion sequence is in progress when either the stop or wait mode is
entered, the conversion of the current channel is suspended. When the MCU
resumes normal operation, that channel is resampled and the conversion
sequence is resumed. As the MCU exits wait mode, the A/D circuits are stable and
valid results can be obtained on the first conversion. However, in stop mode, all
analog bias currents are disabled and it is necessary to allow a stabilization period
when leaving stop mode. If stop mode is exited with a delay (DLY = 1), there is
enough time for these circuits to stabilize before the first conversion. If stop mode
is exited with no delay (DLY bit in OPTION register = 0), allow 10 ms for the A/D
circuitry to stabilize to avoid invalid results.
3.9 A/D Control/Status Register
All bits in this register can be read or written, except bit 7, which is a read-only
status indicator, and bit 6, which always reads as 0. Write to ADCTL to initiate a
conversion. To quit a conversion in progress, write to this register and a new
conversion sequence begins immediately.
Address: $1030
Bit 7
CCF
6
5
4
3
2
1
Bit 0
CA
Read:
Write:
Reset:
SCAN
MULT
CD
CC
CB
0
0
Indeterminate after reset
= Unimplemented
Figure 3-5. A/D Control/Status Register (ADCTL)
CCF — Conversion Complete Flag
A read-only status indicator, this bit is set when all four A/D result registers
contain valid conversion results. Each time the ADCTL register is overwritten,
this bit is automatically cleared to 0 and a conversion sequence is started. In the
continuous mode, CCF is set at the end of the first conversion sequence.
Bit 6 — Unimplemented
Always reads 0
SCAN — Continuous Scan Control Bit
When this control bit is clear, the four requested conversions are performed
once to fill the four result registers. When this control bit is set, conversions are
performed continuously with the result registers updated as data becomes
available.
MULT — Multiple Channel/Single Channel Control Bit
When this bit is clear, the A/D converter system is configured to perform four
consecutive conversions on the single channel specified by the four channel
select bits CD:CA (bits [3:0] of the ADCTL register). When this bit is set, the A/D
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Analog-to-Digital (A/D) Converter
system is configured to perform a conversion on each of four channels where
each result register corresponds to one channel.
NOTE:
When the multiple-channel continuous scan mode is used, extra care is needed in
the design of circuitry driving the A/D inputs. The charge on the capacitive DAC
array before the sample time is related to the voltage on the previously converted
channel. A charge share situation exists between the internal DAC capacitance
and the external circuit capacitance. Although the amount of charge involved is
small, the rate at which it is repeated is every 64 µs for an E clock of 2 MHz. The
RC charging rate of the external circuit must be balanced against this charge
sharing effect to avoid errors in accuracy. Refer to M68HC11 Reference Manual,
Motorola document order number M68HC11RM/AD, for further information.
CD:CA — Channel Selects D:A Bits
Refer to Table 3-2. When a multiple channel mode is selected (MULT = 1), the
two least significant channel select bits (CB and CA) have no meaning and the
CD and CC bits specify which group of four channels is to be converted.
Table 3-2. A/D Converter Channel Selection
Channel Select
Result in ADRx
Control Bits
CD:CC:CB:CA
0000
Channel Signal
if MULT = 1
AN0
AN1
ADR1
ADR2
ADR3
ADR4
ADR1
ADR2
ADR3
ADR4
—
0001
0010
AN2
0011
AN3
0100
AN4
0101
AN5
0110
AN6
0111
AN7
10XX
Reserved
(1)
1100
1101
1110
1111
ADR1
ADR2
ADR3
ADR4
VRH
(1)
VRL
(VRH)/2(1)
Reserved(1)
1. Used for factory testing
Data Sheet
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M68HC11E Family — Rev. 5
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Analog-to-Digital (A/D) Converter
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A/D Converter Result Registers
3.10 A/D Converter Result Registers
These read-only registers hold an 8-bit conversion result. Writes to these registers
have no effect. Data in the A/D converter result registers is valid when the CCF flag
in the ADCTL register is set, indicating a conversion sequence is complete. If
conversion results are needed sooner, refer to Figure 3-3, which shows the A/D
conversion sequence diagram.
Register name: Analog-to-Digital Converter Result Register 1 Address: $1031
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Indeterminate after reset
Register name: Analog-to-Digital Converter Result Register 2 Address: $1032
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Indeterminate after reset
Register name: Analog-to-Digital Converter Result Register 3 Address: $1033
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Indeterminate after reset
Register name: Analog-to-Digital Converter Result Register 4 Address: $1034
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Indeterminate after reset
= Unimplemented
Figure 3-6. Analog-to-Digital Converter
Result Registers (ADR1–ADR4)
M68HC11E Family — Rev. 5
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Data Sheet
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Data Sheet — M68HC11E Family
Section 4. Central Processor Unit (CPU)
4.1 Introduction
Features of the M68HC11 Family include:
•
•
•
•
•
Central processor unit (CPU) architecture
Data types
Addressing modes
Instruction set
Special operations such as subroutine calls and interrupts
The CPU is designed to treat all peripheral, input/output (I/O), and memory
locations identically as addresses in the 64-Kbyte memory map. This is referred to
as memory-mapped I/O. There are no special instructions for I/O that are separate
from those used for memory. This architecture also allows accessing an operand
from an external memory location with no execution time penalty.
4.2 CPU Registers
M68HC11 CPU registers are an integral part of the CPU and are not addressed as
if they were memory locations. The seven registers, discussed in the following
paragraphs, are shown in Figure 4-1.
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Central Processor Unit (CPU)
8-BIT ACCUMULATORS A & B
7
A
0
7
B
0
0
15
D
OR 16-BIT DOUBLE ACCUMULATOR D
IX
INDEX REGISTER X
INDEX REGISTER Y
STACK POINTER
IY
SP
PC
PROGRAM COUNTER
CONDITION CODES
7
0
S
X
H
I
N
Z
V
C
CARRY/BORROW FROM MSB
OVERFLOW
ZERO
NEGATIVE
I-INTERRUPT MASK
HALF CARRY (FROM BIT 3)
X-INTERRUPT MASK
STOP DISABLE
Figure 4-1. Programming Model
4.2.1 Accumulators A, B, and D
Accumulators A and B are general-purpose 8-bit registers that hold operands and
results of arithmetic calculations or data manipulations. For some instructions,
these two accumulators are treated as a single double-byte (16-bit) accumulator
called accumulator D. Although most instructions can use accumulators A or B
interchangeably, these exceptions apply:
•
•
•
•
The ABX and ABY instructions add the contents of 8-bit accumulator B to
the contents of 16-bit register X or Y, but there are no equivalent instructions
that use A instead of B.
The TAP and TPA instructions transfer data from accumulator A to the
condition code register or from the condition code register to accumulator A.
However, there are no equivalent instructions that use B rather than A.
The decimal adjust accumulator A (DAA) instruction is used after
binary-coded decimal (BCD) arithmetic operations, but there is no
equivalent BCD instruction to adjust accumulator B.
The add, subtract, and compare instructions associated with both A and B
(ABA, SBA, and CBA) only operate in one direction, making it important to
plan ahead to ensure that the correct operand is in the correct accumulator.
Data Sheet
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M68HC11E Family — Rev. 5
Central Processor Unit (CPU)
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Central Processor Unit (CPU)
CPU Registers
4.2.2 Index Register X (IX)
The IX register provides a 16-bit indexing value that can be added to the 8-bit offset
provided in an instruction to create an effective address. The IX register can also
be used as a counter or as a temporary storage register.
4.2.3 Index Register Y (IY)
The 16-bit IY register performs an indexed mode function similar to that of the IX
register. However, most instructions using the IY register require an extra byte of
machine code and an extra cycle of execution time because of the way the opcode
map is implemented. Refer to 4.4 Opcodes and Operands for further information.
4.2.4 Stack Pointer (SP)
The M68HC11 CPU has an automatic program stack. This stack can be located
anywhere in the address space and can be any size up to the amount of memory
available in the system. Normally, the SP is initialized by one of the first instructions
in an application program. The stack is configured as a data structure that grows
downward from high memory to low memory. Each time a new byte is pushed onto
the stack, the SP is decremented. Each time a byte is pulled from the stack, the SP
is incremented. At any given time, the SP holds the 16-bit address of the next free
location in the stack. Figure 4-2 is a summary of SP operations.
When a subroutine is called by a jump-to-subroutine (JSR) or branch-to-
subroutine (BSR) instruction, the address of the instruction after the JSR or BSR
is automatically pushed onto the stack, least significant byte first. When the
subroutine is finished, a return-from-subroutine (RTS) instruction is executed. The
RTS pulls the previously stacked return address from the stack and loads it into the
program counter. Execution then continues at this recovered return address.
When an interrupt is recognized, the current instruction finishes normally, the
return address (the current value in the program counter) is pushed onto the stack,
all of the CPU registers are pushed onto the stack, and execution continues at the
address specified by the vector for the interrupt.
At the end of the interrupt service routine, an return-from interrupt (RTI) instruction
is executed. The RTI instruction causes the saved registers to be pulled off the
stack in reverse order. Program execution resumes at the return address.
Certain instructions push and pull the A and B accumulators and the X and Y index
registers and are often used to preserve program context. For example, pushing
accumulator A onto the stack when entering a subroutine that uses accumulator A
and then pulling accumulator A off the stack just before leaving the subroutine
ensures that the contents of a register will be the same after returning from the
subroutine as it was before starting the subroutine.
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Central Processor Unit (CPU)
JSR, JUMP TO SUBROUTINE
MAIN PROGRAM
RTI, RETURN FROM INTERRUPT
STACK
7
0
INTERRUPT ROUTINE
PC
PC
SP
SP+1
$9D = JSR
dd
$3B = RTI
DIRECT
INDEXED, X
INDEXED, Y
CCR
ACCB
ACCA
IXH
RTN
SP+2
NEXT MAIN INSTR.
SP+3
MAIN PROGRAM
SP+4
PC
$AD = JSR
SP+5
IXL
STACK
ff
7
0
SP+6
IYH
RTN
NEXT MAIN INSTR.
SP+7
➩ SP–2
SP–1
SP
IYL
SP+8
RTNH
RTNL
RTNH
RTNL
MAIN PROGRAM
➩ SP+9
PC
$18 = PRE
$AD = JSR
ff
SWI, SOFTWARE INTERRUPT
RTN
STACK
7
0
MAIN PROGRAM
NEXT MAIN INSTR.
PC
➩ SP–9
SP–8
SP–7
SP–6
SP–5
SP–4
SP–3
SP–2
SP–1
SP
$3F = SWI
CCR
ACCB
ACCA
IXH
MAIN PROGRAM
PC
$BD = PRE
hh
INDEXED, Y
RTN
ll
WAI, WAIT FOR INTERRUPT
IXL
NEXT MAIN INSTR.
MAIN PROGRAM
IYH
PC
IYL
$3E = WAI
RTNH
RTNL
BSR, BRANCH TO SUBROUTINE
STACK
7
0
MAIN PROGRAM
PC
➩ SP–2
SP–1
SP
$8D = BSR
LEGEND:
RTNH
RTNL
RTN = ADDRESS OF NEXT INSTRUCTION IN MAIN PROGRAM TO
BE EXECUTED UPON RETURN FROM SUBROUTINE
RTN = MOST SIGNIFICANT BYTE OF RETURN ADDRESS
H
RTN = LEAST SIGNIFICANT BYTE OF RETURN ADDRESS
L
RTS, RETURN FROM
SUBROUTINE
➩ = STACK POINTER POSITION AFTER OPERATION IS COMPLETE
dd = 8-BIT DIRECT ADDRESS ($0000–$00FF) (HIGH BYTE ASSUMED
TO BE $00)
ff = 8-BIT POSITIVE OFFSET $00 (0) TO $FF (255) IS ADDED TO INDEX
hh = HIGH-ORDER BYTE OF 16-BIT EXTENDED ADDRESS
ll = LOW-ORDER BYTE OF 16-BIT EXTENDED ADDRESS
rr= SIGNED RELATIVE OFFSET $80 (–128) TO $7F (+127) (OFFSET
RELATIVE TO THE ADDRESS FOLLOWING THE MACHINE CODE
OFFSET BYTE)
STACK
7
0
MAIN PROGRAM
PC
SP
SP+1
$39 = RTS
RTNH
RTNL
➩ SP+2
Figure 4-2. Stacking Operations
4.2.5 Program Counter (PC)
The program counter, a 16-bit register, contains the address of the next instruction
to be executed. After reset, the program counter is initialized from one of six
possible vectors, depending on operating mode and the cause of reset. See
Table 4-1.
Table 4-1. Reset Vector Comparison
Mode
Normal
POR or RESET Pin
$FFFE, F
Clock Monitor
$FFFC, D
COP Watchdog
$FFFA, B
Test or Boot
$BFFE, F
$BFFC, D
$BFFA, B
Data Sheet
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CPU Registers
4.2.6 Condition Code Register (CCR)
This 8-bit register contains:
•
•
•
Five condition code indicators (C, V, Z, N, and H),
Two interrupt masking bits (IRQ and XIRQ)
A stop disable bit (S)
In the M68HC11 CPU, condition codes are updated automatically by most
instructions. For example, load accumulator A (LDAA) and store accumulator A
(STAA) instructions automatically set or clear the N, Z, and V condition code flags.
Pushes, pulls, add B to X (ABX), add B to Y (ABY), and transfer/exchange
instructions do not affect the condition codes. Refer to Table 4-2, which shows
what condition codes are affected by a particular instruction.
4.2.6.1 Carry/Borrow (C)
The C bit is set if the arithmetic logic unit (ALU) performs a carry or borrow during
an arithmetic operation. The C bit also acts as an error flag for multiply and divide
operations. Shift and rotate instructions operate with and through the carry bit to
facilitate multiple-word shift operations.
4.2.6.2 Overflow (V)
4.2.6.3 Zero (Z)
The overflow bit is set if an operation causes an arithmetic overflow. Otherwise, the
V bit is cleared.
The Z bit is set if the result of an arithmetic, logic, or data manipulation operation
is 0. Otherwise, the Z bit is cleared. Compare instructions do an internal implied
subtraction and the condition codes, including Z, reflect the results of that
subtraction. A few operations (INX, DEX, INY, and DEY) affect the Z bit and no
other condition flags. For these operations, only = and ≠ conditions can be
determined.
4.2.6.4 Negative (N)
The N bit is set if the result of an arithmetic, logic, or data manipulation operation
is negative (MSB = 1). Otherwise, the N bit is cleared. A result is said to be negative
if its most significant bit (MSB) is a 1. A quick way to test whether the contents of a
memory location has the MSB set is to load it into an accumulator and then check
the status of the N bit.
4.2.6.5 Interrupt Mask (I)
The interrupt request (IRQ) mask (I bit) is a global mask that disables all maskable
interrupt sources. While the I bit is set, interrupts can become pending, but the
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operation of the CPU continues uninterrupted until the I bit is cleared. After any
reset, the I bit is set by default and can only be cleared by a software instruction.
When an interrupt is recognized, the I bit is set after the registers are stacked, but
before the interrupt vector is fetched. After the interrupt has been serviced, a
return-from-interrupt instruction is normally executed, restoring the registers to the
values that were present before the interrupt occurred. Normally, the I bit is 0 after
a return from interrupt is executed. Although the I bit can be cleared within an
interrupt service routine, "nesting" interrupts in this way should only be done when
there is a clear understanding of latency and of the arbitration mechanism. Refer
to Section 5. Resets and Interrupts.
4.2.6.6 Half Carry (H)
The H bit is set when a carry occurs between bits 3 and 4 of the arithmetic logic
unit during an ADD, ABA, or ADC instruction. Otherwise, the H bit is cleared. Half
carry is used during BCD operations.
4.2.6.7 X Interrupt Mask (X)
The XIRQ mask (X) bit disables interrupts from the XIRQ pin. After any reset, X is
set by default and must be cleared by a software instruction. When an XIRQ
interrupt is recognized, the X and I bits are set after the registers are stacked, but
before the interrupt vector is fetched. After the interrupt has been serviced, an RTI
instruction is normally executed, causing the registers to be restored to the values
that were present before the interrupt occurred. The X interrupt mask bit is set only
by hardware (RESET or XIRQ acknowledge). X is cleared only by program
instruction (TAP, where the associated bit of A is 0; or RTI, where bit 6 of the value
loaded into the CCR from the stack has been cleared). There is no hardware action
for clearing X.
4.2.6.8 STOP Disable (S)
Setting the STOP disable (S) bit prevents the STOP instruction from putting the
M68HC11 into a low-power stop condition. If the STOP instruction is encountered
by the CPU while the S bit is set, it is treated as a no-operation (NOP) instruction,
and processing continues to the next instruction. S is set by reset; STOP is
disabled by default.
4.3 Data Types
The M68HC11 CPU supports four data types:
1. Bit data
2. 8-bit and 16-bit signed and unsigned integers
3. 16-bit unsigned fractions
4. 16-bit addresses
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Opcodes and Operands
A byte is eight bits wide and can be accessed at any byte location. A word is
composed of two consecutive bytes with the most significant byte at the lower
value address. Because the M68HC11 is an 8-bit CPU, there are no special
requirements for alignment of instructions or operands.
4.4 Opcodes and Operands
The M68HC11 Family of microcontrollers uses 8-bit opcodes. Each opcode
identifies a particular instruction and associated addressing mode to the CPU.
Several opcodes are required to provide each instruction with a range of
addressing capabilities. Only 256 opcodes would be available if the range of values
were restricted to the number able to be expressed in 8-bit binary numbers.
A 4-page opcode map has been implemented to expand the number of
instructions. An additional byte, called a prebyte, directs the processor from page
0 of the opcode map to one of the other three pages. As its name implies, the
additional byte precedes the opcode.
A complete instruction consists of a prebyte, if any, an opcode, and zero, one, two,
or three operands. The operands contain information the CPU needs for executing
the instruction. Complete instructions can be from one to five bytes long.
4.5 Addressing Modes
Six addressing modes can be used to access memory:
•
•
•
•
•
•
Immediate
Direct
Extended
Indexed
Inherent
Relative
These modes are detailed in the following paragraphs. All modes except inherent
mode use an effective address. The effective address is the memory address from
which the argument is fetched or stored or the address from which execution is to
proceed. The effective address can be specified within an instruction, or it can be
calculated.
4.5.1 Immediate
In the immediate addressing mode, an argument is contained in the byte(s)
immediately following the opcode. The number of bytes following the opcode
matches the size of the register or memory location being operated on. There are
2-, 3-, and 4- (if prebyte is required) byte immediate instructions. The effective
address is the address of the byte following the instruction.
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4.5.2 Direct
In the direct addressing mode, the low-order byte of the operand address is
contained in a single byte following the opcode, and the high-order byte of the
address is assumed to be $00. Addresses $00–$FF are thus accessed directly,
using 2-byte instructions. Execution time is reduced by eliminating the additional
memory access required for the high-order address byte. In most applications, this
256-byte area is reserved for frequently referenced data. In M68HC11 MCUs, the
memory map can be configured for combinations of internal registers, RAM, or
external memory to occupy these addresses.
4.5.3 Extended
4.5.4 Indexed
In the extended addressing mode, the effective address of the argument is
contained in two bytes following the opcode byte. These are 3-byte instructions (or
4-byte instructions if a prebyte is required). One or two bytes are needed for the
opcode and two for the effective address.
In the indexed addressing mode, an 8-bit unsigned offset contained in the
instruction is added to the value contained in an index register (IX or IY). The sum
is the effective address. This addressing mode allows referencing any memory
location in the 64-Kbyte address space. These are 2- to 5-byte instructions,
depending on whether or not a prebyte is required.
4.5.5 Inherent
In the inherent addressing mode, all the information necessary to execute the
instruction is contained in the opcode. Operations that use only the index registers
or accumulators, as well as control instructions with no arguments, are included in
this addressing mode. These are
1- or 2-byte instructions.
4.5.6 Relative
The relative addressing mode is used only for branch instructions. If the branch
condition is true, an 8-bit signed offset included in the instruction is added to the
contents of the program counter to form the effective branch address. Otherwise,
control proceeds to the next instruction. These are usually 2-byte instructions.
4.6 Instruction Set
Refer to Table 4-2, which shows all the M68HC11 instructions in all possible
addressing modes. For each instruction, the table shows the operand construction,
the number of machine code bytes, and execution time in CPU E-clock cycles.
Data Sheet
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Instruction Set
Table 4-2. Instruction Set (Sheet 1 of 7)
Addressing
Mode
Instruction
Operand Cycles
Condition Codes
Mnemonic
Operation
Description
Opcode
S
X
H
I
N
Z
V
C
ABA
Add
A + B ⇒ A
INH
1B
—
2
—
—
∆
—
∆
∆
∆
∆
Accumulators
ABX
ABY
ADCA (opr)
Add B to X
Add B to Y
Add with Carry
to A
IX + (00 : B) ⇒ IX
IY + (00 : B) ⇒ IY
A + M + C ⇒ A
INH
INH
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
3A
3A
89
99
—
—
3
4
2
3
4
4
5
2
3
4
4
5
—
—
—
—
—
—
—
—
∆
—
—
—
—
—
∆
—
—
∆
—
—
∆
—
—
∆
18
18
18
18
18
18
18
A
A
A
A
A
B
B
B
B
B
ii
dd
B9 hh ll
A9
A9
C9 ii
D9 dd
F9 hh ll
E9
E9
ff
ff
ADCB (opr)
ADDA (opr)
ADDB (opr)
ADDD (opr)
ANDA (opr)
ANDB (opr)
Add with Carry
to B
B + M + C ⇒ B
A + M ⇒ A
—
—
—
—
—
—
—
—
—
—
—
—
∆
∆
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
0
0
∆
∆
IND,X
IND,Y
ff
ff
ii
dd
Add Memory to
A
A
A
A
A
A
B
B
B
B
B
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
8B
9B
2
3
4
4
5
2
3
4
4
5
4
5
6
6
7
BB hh ll
AB ff
AB ff
CB ii
DB dd
FB hh ll
EB ff
EB ff
C3 jj kk
D3 dd
F3 hh ll
Add Memory to
B
B + M ⇒ B
∆
∆
Add 16-Bit to D D + (M : M + 1) ⇒ D
—
—
—
∆
E3
E3
ff
ff
ii
dd
AND A with
Memory
A • M ⇒ A
B • M ⇒ B
A
A
A
A
A
B
B
B
B
B
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
84
94
2
3
4
4
5
2
3
4
4
5
—
—
B4 hh ll
A4
A4
C4 ii
D4 dd
F4 hh ll
E4
E4
ff
ff
AND B with
Memory
ff
ff
18
18
ASL (opr)
ASLA
Arithmetic Shift
Left
EXT
IND,X
IND,Y
78
68
68
hh ll
ff
6
6
7
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
0
ff
b7
b0
C
Arithmetic Shift
Left A
A
B
INH
INH
INH
48
58
05
—
—
—
2
2
3
0
0
b7
b7
b0
b0
C
C
ASLB
ASLD
Arithmetic Shift
Left B
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
Arithmetic Shift
Left D
0
b7 A b0 b7 B b0
C
ASR
Arithmetic Shift
Right
EXT
IND,X
IND,Y
77
67
67
hh ll
ff
6
6
7
18
ff
b7
b7
b7
b0
b0
b0
C
ASRA
ASRB
BCC (rel)
Arithmetic Shift
Right A
A
B
INH
INH
REL
47
—
—
2
2
3
C
C
Arithmetic Shift
Right B
57
Branch if Carry
Clear
Clear Bit(s)
? C = 0
24
15
rr
—
—
—
—
—
—
—
—
—
—
—
0
—
—
BCLR (opr)
(msk)
M • (mm) ⇒ M
DIR
IND,X
IND,Y
dd mm
6
7
8
∆
∆
1D ff mm
1D ff mm
18
BCS (rel)
Branch if Carry
Set
? C = 1
REL
25
rr
3
—
—
—
—
—
—
—
—
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
81
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
Table 4-2. Instruction Set (Sheet 2 of 7)
Addressing
Mode
REL
Instruction
Operand Cycles
Condition Codes
Mnemonic
Operation
Description
Opcode
S
X
H
I
N
Z
V
C
BEQ (rel)
BGE (rel)
BGT (rel)
BHI (rel)
Branch if = Zero
Branch if ∆ Zero
Branch if > Zero
? Z = 1
? N ⊕ V = 0
? Z + (N ⊕ V) = 0
? C + Z = 0
27
rr
3
3
3
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
REL
REL
2C rr
2E
22
rr
rr
Branch if
Higher
REL
BHS (rel)
Branch if
Higher or Same
Bit(s) Test A
with Memory
? C = 0
A • M
REL
24
rr
3
—
—
—
—
—
—
—
—
—
—
—
0
—
—
BITA (opr)
A
A
A
A
A
IMM
DIR
EXT
IND,X
IND,Y
85
95
ii
dd
2
3
4
4
5
∆
∆
B5 hh ll
A5
A5
ff
ff
18
18
BITB (opr)
Bit(s) Test B
with Memory
B • M
B
B
B
B
B
IMM
DIR
EXT
IND,X
IND,Y
C5 ii
D5 dd
F5 hh ll
E5
E5
2
3
4
4
5
—
—
—
—
∆
∆
0
—
ff
ff
BLE (rel)
BLO (rel)
BLS (rel)
Branch if ∆ Zero
? Z + (N ⊕ V) = 1
? C = 1
? C + Z = 1
REL
REL
REL
2F
25
23
rr
rr
rr
3
3
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Branch if Lower
Branch if Lower
or Same
BLT (rel)
BMI (rel)
BNE (rel)
Branch if < Zero
Branch if Minus
Branch if not =
Zero
? N ⊕ V = 1
? N = 1
? Z = 0
REL
REL
REL
2D rr
3
3
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2B
26
rr
rr
BPL (rel)
BRA (rel)
Branch if Plus
Branch Always
? N = 0
? 1 = 1
REL
REL
2A
20
rr
rr
dd mm
rr
ff mm
rr
3
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
BRCLR(opr)
(msk)
Branch if
Bit(s) Clear
? M • mm = 0
DIR
IND,X
IND,Y
13
1F
1F
6
7
8
(rel)
18
ff mm
rr
BRN (rel)
BRSET(opr)
(msk)
Branch Never
Branch if Bit(s)
Set
? 1 = 0
? (M) • mm = 0
REL
DIR
IND,X
IND,Y
21
rr
dd mm
rr
ff mm
rr
ff mm
rr
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
12
1E
1E
6
7
8
(rel)
18
18
BSET (opr)
(msk)
Set Bit(s)
M + mm ⇒ M
DIR
IND,X
IND,Y
14
dd mm
6
7
8
—
—
—
—
∆
∆
0
—
1C ff mm
1C ff mm
BSR (rel)
BVC (rel)
BVS (rel)
Branch to
Subroutine
Branch if
Overflow Clear
See Figure 3–2
? V = 0
REL
REL
REL
8D rr
6
3
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
28
29
rr
rr
Branch if
? V = 1
Overflow Set
CBA
CLC
CLI
Compare A to B
Clear Carry Bit
Clear Interrupt
Mask
A – B
0 ⇒ C
0 ⇒ I
INH
INH
INH
11
0C
0E
—
—
—
2
2
2
—
—
—
—
—
—
—
—
—
—
—
0
∆
∆
∆
∆
0
—
—
—
—
—
—
—
CLR (opr)
Clear Memory
Byte
0 ⇒ M
EXT
IND,X
IND,Y
7F
6F
6F
hh ll
ff
ff
6
6
7
—
—
—
—
0
1
0
0
18
CLRA
CLRB
CLV
Clear
Accumulator A
Clear
Accumulator B
Clear Overflow
Flag
0 ⇒ A
0 ⇒ B
0 ⇒ V
A
B
INH
INH
INH
4F
5F
0A
—
—
—
2
2
2
—
—
—
—
—
—
—
—
—
—
—
—
0
0
1
1
0
0
0
0
0
—
—
—
Data Sheet
82
M68HC11E Family — Rev. 5
MOTOROLA
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
Instruction Set
Table 4-2. Instruction Set (Sheet 3 of 7)
Addressing
Mode
Instruction
Operand Cycles
Condition Codes
Mnemonic
Operation
Description
Opcode
S
X
H
I
N
Z
V
C
CMPA (opr)
Compare A to
Memory
A – M
A
A
A
A
A
IMM
DIR
EXT
IND,X
IND,Y
81
91
ii
dd
2
3
4
4
5
—
—
—
—
∆
∆
∆
∆
B1 hh ll
A1
A1
ff
ff
18
CMPB (opr)
Compare B to
Memory
B – M
B
B
B
B
B
IMM
DIR
EXT
IND,X
IND,Y
EXT
IND,X
IND,Y
C1 ii
D1 dd
F1 hh ll
2
3
4
4
5
6
6
7
—
—
—
—
∆
∆
∆
∆
E1
E1
ff
ff
18
18
COM (opr)
COMA
Ones
Complement
Memory Byte
Ones
Complement
A
Ones
Complement
B
$FF – M ⇒ M
$FF – A ⇒ A
$FF – B ⇒ B
D – M : M + 1
73
63
63
hh ll
ff
ff
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
0
0
0
∆
1
1
1
∆
A
B
INH
43
—
—
2
COMB
INH
53
2
CPD (opr)
Compare D to
Memory 16-Bit
IMM
DIR
EXT
IND,X
IND,Y
1A
1A
1A
1A
CD
83
93
B3
A3
A3
jj kk
dd
hh ll
ff
5
6
7
7
7
ff
CPX (opr)
CPY (opr)
Compare X to
Memory 16-Bit
IX – M : M + 1
IY – M : M + 1
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
8C jj kk
9C dd
BC hh ll
AC ff
AC ff
8C jj kk
9C dd
BC hh ll
AC ff
AC ff
4
5
6
6
7
5
6
7
7
7
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
CD
Compare Y to
Memory 16-Bit
18
18
18
1A
18
DAA
Decimal Adjust Adjust Sum to BCD
A
INH
19
—
2
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
DEC (opr)
Decrement
M – 1 ⇒ M
A – 1 ⇒ A
B – 1 ⇒ B
EXT
IND,X
IND,Y
7A
6A
6A
hh ll
ff
6
6
7
—
Memory Byte
18
ff
DECA
DECB
Decrement
Accumulator
A
A
B
INH
4A
—
—
2
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
—
—
Decrement
Accumulator
B
INH
5A
2
DES
DEX
Decrement
Stack Pointer
SP – 1 ⇒ SP
IX – 1 ⇒ IX
INH
INH
34
09
—
—
3
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Decrement
Index Register
X
∆
DEY
Decrement
Index Register
Y
IY – 1 ⇒ IY
A ⊕ M ⇒ A
INH
18
09
—
4
—
—
—
—
—
—
—
—
—
∆
∆
—
0
—
—
EORA (opr)
Exclusive OR A
with Memory
A
A
A
A
A
B
B
B
B
B
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
88
98
ii
dd
2
3
4
4
5
2
3
4
4
5
∆
B8 hh ll
A8
A8
C8 ii
D8 dd
F8 hh ll
E8
E8
ff
ff
18
18
EORB (opr)
Exclusive OR B
with Memory
B ⊕ M ⇒ B
—
—
—
—
∆
∆
0
—
ff
ff
FDIV
IDIV
Fractional
Divide 16 by 16
D / IX ⇒ IX; r ⇒ D
D / IX ⇒ IX; r ⇒ D
INH
03
02
—
—
41
—
—
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
Integer Divide
16 by 16
INH
41
0
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
83
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
Table 4-2. Instruction Set (Sheet 4 of 7)
Addressing
Mode
Instruction
Operand Cycles
Condition Codes
Mnemonic
Operation
Description
Opcode
S
X
H
I
N
Z
V
C
INC (opr)
Increment
Memory Byte
M + 1 ⇒ M
EXT
IND,X
IND,Y
7C hh ll
6C ff
6C ff
6
6
7
—
—
—
—
∆
∆
∆
—
18
INCA
INCB
Increment
Accumulator
A
A + 1 ⇒ A
B + 1 ⇒ B
A
B
INH
4C
—
—
2
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
—
—
Increment
Accumulator
B
INH
5C
2
INS
INX
Increment
Stack Pointer
Increment
Index Register
X
SP + 1 ⇒ SP
IX + 1 ⇒ IX
INH
INH
31
08
—
—
3
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
∆
INY
Increment
Index Register
Y
IY + 1 ⇒ IY
See Figure 3–2
See Figure 3–2
INH
18
08
—
4
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
∆
—
—
—
—
—
—
JMP (opr)
JSR (opr)
Jump
EXT
IND,X
IND,Y
DIR
EXT
7E
6E
6E
hh ll
ff
3
3
4
5
6
6
7
—
—
18
18
ff
Jump to
Subroutine
9D dd
BD hh ll
AD ff
IND,X
IND,Y
AD ff
LDAA (opr)
LDAB (opr)
LDD (opr)
LDS (opr)
LDX (opr)
LDY (opr)
Load
Accumulator
A
M ⇒ A
A
A
A
A
A
B
B
B
B
B
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
86
96
ii
dd
2
3
4
4
5
2
3
4
4
5
3
4
5
5
6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
0
0
0
0
0
0
—
—
—
—
—
—
B6 hh ll
A6
A6
C6 ii
D6 dd
F6 hh ll
E6
E6
CC jj kk
DC dd
FC hh ll
EC ff
EC ff
8E
9E
BE hh ll
AE ff
AE ff
CE jj kk
DE dd
FE hh ll
EE ff
ff
ff
18
18
18
18
CD
Load
Accumulator
B
M ⇒ B
ff
ff
Load Double
Accumulator
D
M ⇒ A,M + 1 ⇒ B
M : M + 1 ⇒ SP
M : M + 1 ⇒ IX
M : M + 1 ⇒ IY
Load Stack
Pointer
IMM
DIR
EXT
IND,X
IND,Y
jj kk
dd
3
4
5
5
6
Load Index
Register
X
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
3
4
5
5
6
4
5
6
6
6
EE ff
CE jj kk
DE dd
FE hh ll
EE ff
EE ff
Load Index
Register
Y
18
18
18
1A
18
LSL (opr)
LSLA
Logical Shift
Left
EXT
IND,X
IND,Y
78
68
68
hh ll
ff
ff
6
6
7
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
0
18
b7
b7
b7
b0
b0
b0
C
C
C
Logical Shift
Left A
A
B
INH
INH
INH
48
58
05
—
—
—
2
2
3
0
0
LSLB
Logical Shift
Left B
LSLD
Logical Shift
Left Double
0
b7 A b0 b7 B b0
C
Data Sheet
84
M68HC11E Family — Rev. 5
MOTOROLA
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
Instruction Set
Table 4-2. Instruction Set (Sheet 5 of 7)
Addressing
Mode
Instruction
Operand Cycles
Condition Codes
Mnemonic
Operation
Description
Opcode
S
X
H
I
N
Z
V
C
LSR (opr)
Logical Shift
Right
EXT
IND,X
IND,Y
74
64
64
hh ll
ff
ff
6
6
7
—
—
—
—
0
∆
∆
∆
0
0
0
18
b7
b7
b7
b0
b0
b0
C
C
C
LSRA
LSRB
LSRD
Logical Shift
Right A
A
B
INH
INH
INH
INH
44
54
04
3D
—
—
—
—
2
—
—
—
—
—
—
—
—
—
—
—
—
0
0
0
∆
∆
∆
∆
∆
∆
∆
∆
∆
Logical Shift
Right B
2
Logical Shift
Right Double
3
0
b7 A b0 b7 B b0
A ∗ B ⇒ D
C
MUL
NEG (opr)
Multiply 8 by 8
10
—
—
—
—
—
—
—
—
—
∆
—
∆
—
∆
∆
∆
Two’s
Complement
Memory Byte
0 – M ⇒ M
EXT
IND,X
IND,Y
70
60
60
hh ll
ff
ff
6
6
7
18
NEGA
NEGB
Two’s
Complement
A
Two’s
Complement
B
0 – A ⇒ A
0 – B ⇒ B
A
B
INH
INH
INH
40
50
01
—
—
—
2
2
2
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
NOP
No operation
No Operation
—
—
—
—
—
—
—
—
—
—
—
0
—
—
ORAA (opr)
OR
Accumulator
A (Inclusive)
A + M ⇒ A
A
A
A
A
A
B
B
B
B
B
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
8A
9A
ii
dd
2
3
4
4
5
2
3
4
4
5
∆
∆
BA hh ll
AA ff
AA ff
CA ii
DA dd
FA hh ll
EA ff
EA ff
18
18
ORAB (opr)
OR
Accumulator
B (Inclusive)
B + M ⇒ B
—
—
—
—
∆
∆
0
—
PSHA
PSHB
PSHX
Push A onto
Stack
A ⇒ Stk,SP = SP – 1
B ⇒ Stk,SP = SP – 1
A
INH
INH
INH
36
37
3C
—
—
—
3
3
4
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Push B onto
Stack
Push X onto IX ⇒ Stk,SP = SP – 2
B
Stack (Lo
First)
PSHY
Push Y onto IY ⇒ Stk,SP = SP – 2
INH
18
3C
—
5
—
—
—
—
—
—
—
—
Stack (Lo
First)
PULA
PULB
PULX
Pull A from
Stack
Pull B from
Stack
SP = SP + 1, A ⇐ Stk A
SP = SP + 1, B ⇐ Stk B
INH
INH
INH
32
33
38
—
—
—
4
4
5
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Pull X From SP = SP + 2, IX ⇐ Stk
Stack (Hi
First)
PULY
ROL (opr)
ROLA
Pull Y from
Stack (Hi
First)
SP = SP + 2, IY ⇐ Stk
INH
18
18
38
—
6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
∆
—
∆
—
∆
—
∆
Rotate Left
Rotate Left A
Rotate Left B
Rotate Right
EXT
IND,X
IND,Y
79
69
69
hh ll
ff
6
6
7
ff
b7
b7
b7
b0
b0
b0
C
A
B
INH
49
—
—
2
∆
∆
∆
∆
C
ROLB
INH
59
2
∆
∆
∆
∆
C
ROR (opr)
EXT
IND,X
IND,Y
76
66
66
hh ll
ff
6
6
7
∆
∆
∆
∆
b7
b0
C
18
ff
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
85
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
Table 4-2. Instruction Set (Sheet 6 of 7)
Addressing
Mode
Instruction
Operand Cycles
Condition Codes
Mnemonic
Operation
Description
Opcode
S
X
H
I
N
Z
V
C
RORA
Rotate Right A
A
B
INH
46
—
—
2
2
—
—
—
—
∆
∆
∆
∆
b7
b7
b0
b0
C
C
RORB
Rotate Right B
INH
56
—
—
—
—
∆
∆
∆
∆
RTI
RTS
Return from
Interrupt
See Figure 3–2
See Figure 3–2
A – B ⇒ A
INH
INH
INH
3B
39
10
—
—
—
12
5
∆
↓
∆
∆
∆
—
∆
∆
—
∆
∆
—
∆
∆
—
∆
Return from
Subroutine
Subtract B from
A
Subtract with
Carry from A
—
—
—
—
—
—
—
—
—
—
—
—
SBA
2
SBCA (opr)
A – M – C ⇒ A
A
A
A
A
A
IMM
DIR
EXT
IND,X
IND,Y
82
92
ii
dd
2
3
4
4
5
∆
∆
∆
∆
B2 hh ll
A2
A2
ff
ff
18
18
SBCB (opr)
Subtract with
Carry from B
B – M – C ⇒ B
B
B
B
B
B
IMM
DIR
EXT
IND,X
IND,Y
C2 ii
D2 dd
F2 hh ll
E2
E2
2
3
4
4
5
—
—
—
—
∆
∆
∆
∆
ff
ff
SEC
SEI
Set Carry
1 ⇒ C
1 ⇒ I
INH
INH
0D
0F
—
—
2
2
—
—
—
—
—
—
—
1
—
—
—
—
—
—
1
Set Interrupt
Mask
—
SEV
Set Overflow
Flag
Store
Accumulator
A
1 ⇒ V
INH
0B
—
2
—
—
—
—
—
—
—
—
—
—
1
0
—
—
STAA (opr)
A ⇒ M
A
A
A
A
B
B
B
B
DIR
EXT
IND,X
IND,Y
DIR
EXT
IND,X
IND,Y
97
B7
A7 ff
A7 ff
D7 dd
F7
E7 ff
E7 ff
DD dd
FD hh ll
ED ff
dd
3
4
4
5
3
4
4
5
∆
∆
hh ll
18
18
18
STAB (opr)
STD (opr)
Store
Accumulator
B
B ⇒ M
—
—
—
—
—
—
—
—
∆
∆
∆
∆
0
0
—
—
hh ll
Store
Accumulator
D
A ⇒ M, B ⇒ M + 1
DIR
EXT
IND,X
IND,Y
4
5
5
6
ED ff
STOP
Stop Internal
Clocks
—
INH
CF
—
2
—
—
—
—
—
—
—
—
—
—
—
0
—
—
STS (opr)
Store Stack
Pointer
SP ⇒ M : M + 1
DIR
EXT
IND,X
IND,Y
9F
dd
4
5
5
6
∆
∆
BF hh ll
AF ff
AF ff
18
STX (opr)
STY (opr)
SUBA (opr)
Store Index
Register X
IX ⇒ M : M + 1
IY ⇒ M : M + 1
A – M ⇒ A
DIR
EXT
IND,X
IND,Y
DIR
EXT
IND,X
IND,Y
DF dd
4
5
5
6
5
6
6
6
—
—
—
—
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
0
0
∆
—
—
∆
FF
hh ll
EF ff
EF ff
DF dd
CD
Store Index
Register Y
18
18
1A
18
FF
hh ll
EF ff
EF ff
Subtract
Memory from
A
A
A
A
A
A
A
A
A
A
A
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
IMM
DIR
EXT
IND,X
IND,Y
80
90
ii
dd
2
3
4
4
5
2
3
4
4
5
4
5
6
6
7
B0 hh ll
A0
A0
ff
ff
18
18
18
SUBB (opr)
SUBD (opr)
Subtract
Memory from
B
B – M ⇒ B
C0 ii
D0 dd
F0 hh ll
—
—
—
—
—
—
—
—
∆
∆
∆
∆
∆
∆
∆
∆
E0
E0
ff
ff
Subtract
Memory from
D
D – M : M + 1 ⇒ D
83
93
jj kk
dd
B3 hh ll
A3
A3
ff
ff
Data Sheet
86
M68HC11E Family — Rev. 5
MOTOROLA
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
Instruction Set
Table 4-2. Instruction Set (Sheet 7 of 7)
Addressing
Mode
Instruction
Operand Cycles
Condition Codes
Mnemonic
Operation
Description
Opcode
S
X
H
I
N
Z
V
C
SWI
Software
Interrupt
See Figure 3–2
INH
3F
—
14
—
—
—
1
—
—
—
—
TAB
TAP
Transfer A to B
A ⇒ B
INH
INH
16
06
—
—
2
2
—
—
—
—
∆
∆
∆
∆
0
—
Transfer A to
CC Register
A ⇒ CCR
∆
↓
∆
∆
∆
∆
TBA
Transfer B to A
B ⇒ A
INH
INH
17
00
—
—
2
*
—
—
—
—
—
—
—
—
∆
∆
0
—
—
TEST
TEST (Only in Address Bus Counts
Test Modes)
—
—
—
TPA
Transfer CC
Register to A
Test for Zero or
Minus
CCR ⇒ A
INH
07
—
2
—
—
—
—
—
—
—
—
—
—
—
0
—
0
TST (opr)
M – 0
EXT
IND,X
IND,Y
7D hh ll
6D ff
6D ff
6
6
7
∆
∆
18
TSTA
TSTB
TSX
Test A for Zero
or Minus
A – 0
B – 0
A
B
INH
INH
INH
INH
INH
INH
INH
INH
INH
4D
5D
30
30
35
35
3E
8F
8F
—
—
—
—
—
—
—
—
—
2
2
3
4
3
4
**
3
4
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
∆
∆
0
0
Test B for Zero
or Minus
Transfer Stack
Pointer to X
Transfer Stack
Pointer to Y
∆
∆
0
0
SP + 1 ⇒ IX
SP + 1 ⇒ IY
IX – 1 ⇒ SP
IY – 1 ⇒ SP
Stack Regs & WAIT
IX ⇒ D, D ⇒ IX
IY ⇒ D, D ⇒ IY
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
TSY
18
18
TXS
Transfer X to
Stack Pointer
Transfer Y to
Stack Pointer
Wait for
Interrupt
TYS
WAI
XGDX
XGDY
Exchange D
with X
Exchange D
with Y
18
Cycle
*
Infinity or until reset occurs
**
12 cycles are used beginning with the opcode fetch. A wait state is entered which remains in effect for an integer number of MPU E-clock
cycles (n) until an interrupt is recognized. Finally, two additional cycles are used to fetch the appropriate interrupt vector (14 + n total).
Operands
dd
ff
hh
ii
jj
kk
ll
mm
rr
= 8-bit direct address ($0000–$00FF) (high byte assumed to be $00)
= 8-bit positive offset $00 (0) to $FF (255) (is added to index)
= High-order byte of 16-bit extended address
= One byte of immediate data
= High-order byte of 16-bit immediate data
= Low-order byte of 16-bit immediate data
= Low-order byte of 16-bit extended address
= 8-bit mask (set bits to be affected)
= Signed relative offset $80 (–128) to $7F (+127)
(offset relative to address following machine code offset byte))
Operators
Condition Codes
( )
⇐
⇑
Contents of register shown inside parentheses
—
0
Bit not changed
Is transferred to
Bit always cleared
Is pulled from stack
Is pushed onto stack
Boolean AND
1
Bit always set
⇓
∆
↓
Bit cleared or set, depending on operation
Bit can be cleared, cannot become set
•
+
Arithmetic addition symbol except where used as inclusive-OR symbol
in Boolean formula
⊕
∗
:
Exclusive-OR
Multiply
Concatenation
–
Arithmetic subtraction symbol or negation symbol (two’s complement)
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
87
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
Data Sheet
88
M68HC11E Family — Rev. 5
MOTOROLA
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Data Sheet — M68HC11E Family
Section 5. Resets and Interrupts
5.1 Introduction
Resets and interrupt operations load the program counter with a vector that points
to a new location from which instructions are to be fetched. A reset immediately
stops execution of the current instruction and forces the program counter to a
known starting address. Internal registers and control bits are initialized so the
MCU can resume executing instructions. An interrupt temporarily suspends normal
program execution while an interrupt service routine is being executed. After an
interrupt has been serviced, the main program resumes as if there had been no
interruption.
5.2 Resets
The four possible sources of reset are:
•
•
•
•
Power-on reset (POR)
External reset (RESET)
Computer operating properly (COP) reset
Clock monitor reset
POR and RESET share the normal reset vector. COP reset and the clock monitor
reset each has its own vector.
5.2.1 Power-On Reset (POR)
A positive transition on VDD generates a power-on reset (POR), which is used only
for power-up conditions. POR cannot be used to detect drops in power supply
voltages. A 4064 tCYC (internal clock cycle) delay after the oscillator becomes
active allows the clock generator to stabilize. If RESET is at logical 0 at the end of
4064 tCYC, the CPU remains in the reset condition until RESET goes to logical 1.
The POR circuit only initializes internal circuitry during cold starts. Refer to
Figure 1-7. External Reset Circuit.
NOTE:
It is important to protect the MCU during power transitions. Most M68HC11
systems need an external circuit that holds the RESET pin low whenever VDD is
below the minimum operating level. This external voltage level detector, or other
external reset circuits, are the usual source of reset in a system.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
89
Resets and Interrupts
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Resets and Interrupts
5.2.2 External Reset (RESET)
The CPU distinguishes between internal and external reset conditions by sensing
whether the reset pin rises to a logic 1 in less than two E-clock cycles after an
internal device releases reset. When a reset condition is sensed, the RESET pin is
driven low by an internal device for four E-clock cycles, then released. Two E-clock
cycles later it is sampled. If the pin is still held low, the CPU assumes that an
external reset has occurred. If the pin is high, it indicates that the reset was initiated
internally by either the COP system or the clock monitor.
CAUTION:
Do not connect an external resistor capacitor (RC) power-up delay circuit to the
reset pin of M68HC11 devices because the circuit charge time constant can cause
the device to misinterpret the type of reset that occurred.
5.2.3 Computer Operating Properly (COP) Reset
The MCU includes a COP system to help protect against software failures. When
the COP is enabled, the software is responsible for keeping a free-running
watchdog timer from timing out. When the software is no longer being executed in
the intended sequence, a system reset is initiated.
The state of the NOCOP bit in the CONFIG register determines whether the COP
system is enabled or disabled. To change the enable status of the COP system,
change the contents of the CONFIG register and then perform a system reset. In
the special test and bootstrap operating modes, the COP system is initially
inhibited by the disable resets (DISR) control bit in the TEST1 register. The DISR
bit can subsequently be written to 0 to enable COP resets.
The COP timer rate control bits CR[1:0] in the OPTION register determine the COP
timeout period. The system E clock is divided by 215 and then further scaled by a
factor shown in Table 5-1. After reset, these bits are 0, which selects the fastest
timeout period. In normal operating modes, these bits can be written only once
within 64 bus cycles after reset.
Table 5-1. COP Timer Rate Select
XTAL = 4.0 MHz
Timeout
XTAL = 8.0 MHz XTAL = 12.0 MHz XTAL = 16.0 MHz
Timeout Timeout Timeout
Divide
E/215 By
CR[1:0]
– 0 ms, + 32.8 ms – 0 ms, + 16.4 ms – 0 ms, + 10.9 ms – 0 ms, + 8.2 ms
0 0
0 1
1 0
1 1
1
4
32.768 ms
131.072 ms
524.28 ms
2.098 s
16.384 ms
65.536 ms
262.14 ms
1.049 s
10.923 ms
43.691 ms
174.76 ms
699.05 ms
3.0 MHz
8.19 ms
32.8 ms
131 ms
524 ms
4.0 MHz
16
64
E =
1.0 MHz
2.0 MHz
Data Sheet
90
M68HC11E Family — Rev. 5
MOTOROLA
Resets and Interrupts
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Resets and Interrupts
Resets
Address
$103A
Bit 7
6
BIT 6
0
5
BIT 5
0
4
BIT 4
0
3
BIT 3
0
2
BIT 2
0
1
BIT 1
0
Bit 0
BIT 0
0
Read:
Write:
Reset:
BIT 7
0
Figure 5-1. Arm/Reset COP Timer Circuitry Register (COPRST)
Complete this 2-step reset sequence to service the COP timer:
1. Write $55 to COPRST to arm the COP timer clearing mechanism.
2. Write $AA to COPRST to clear the COP timer.
Performing instructions between these two steps is possible as long
as both steps are completed in the correct sequence before the timer times out.
5.2.4 Clock Monitor Reset
The clock monitor circuit is based on an internal resistor capacitor (RC) time delay.
If no MCU clock edges are detected within this RC time delay, the clock monitor
can optionally generate a system reset. The clock monitor function is enabled or
disabled by the CME control bit in the OPTION register. The presence of a timeout
is determined by the RC delay, which allows the clock monitor to operate without
any MCU clocks.
Clock monitor is used as a backup for the COP system. Because the COP needs
a clock to function, it is disabled when the clock stops. Therefore, the clock monitor
system can detect clock failures not detected by the COP system.
Semiconductor wafer processing causes variations of the RC timeout values
between individual devices. An E-clock frequency below 10 kHz is detected as a
clock monitor error. An E-clock frequency of 200 kHz or more prevents clock
monitor errors. Using the clock monitor function when the E-clock is below 200 kHz
is not recommended.
Special considerations are needed when a STOP instruction is executed and the
clock monitor is enabled. Because the STOP function causes the clocks to be
halted, the clock monitor function generates a reset sequence if it is enabled at the
time the stop mode was initiated. Before executing a STOP instruction, clear the
CME bit in the OPTION register to 0 to disable the clock monitor. After recovery
from STOP, set the CME bit to logic 1 to enable the clock monitor. Alternatively,
executing a STOP instruction with the CME bit set to logic 1 can be used as a
software initiated reset.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
91
Resets and Interrupts
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Resets and Interrupts
5.2.5 System Configuration Options Register
Address:
$1039
Bit 7
6
CSEL
0
5
IRQE(1)
0
4
DLY(1)
1
3
CME
0
2
1
CR1(1)
0
Bit 0
CR0(1)
0
Read:
Write:
Reset:
ADPU
0
0
1. Can be written only once in first 64 cycles out of reset in normal mode or at any time in special modes
= Unimplemented
Figure 5-2. System Configuration Options Register (OPTION)
ADPU — Analog-to-Digital Converter Power-Up Bit
Refer to Section 3. Analog-to-Digital (A/D) Converter.
CSEL — Clock Select Bit
Refer to Section 3. Analog-to-Digital (A/D) Converter.
IRQE — Configure IRQ for Edge-Sensitive-Only Operation Bit
0 = IRQ is configured for level-sensitive operation.
1 = IRQ is configured for edge-sensitive-only operation.
DLY — Enable Oscillator Startup Delay Bit
Refer to Section 2. Operating Modes and On-Chip Memory and Section 3.
Analog-to-Digital (A/D) Converter.
CME — Clock Monitor Enable Bit
This control bit can be read or written at any time and controls whether or not
the internal clock monitor circuit triggers a reset sequence when the system
clock is slow or absent. When it is clear, the clock monitor circuit is disabled, and
when it is set, the clock monitor circuit is enabled. Reset clears the CME bit.
0 = Clock monitor circuit disabled
1 = Slow or stopped clocks cause reset
Bit 2 — Unimplemented
Always reads 0
CR[1:0] — COP Timer Rate Select Bit
The internal E clock is first divided by 215 before it enters the COP watchdog
system. These control bits determine a scaling factor for the watchdog timer.
See Table 5-1 for specific timeout settings.
Data Sheet
92
M68HC11E Family — Rev. 5
Resets and Interrupts
MOTOROLA
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Resets and Interrupts
Effects of Reset
5.2.6 Configuration Control Register
Address:
$103F
Bit 7
6
EE2
0
5
EE1
0
4
EE0
0
3
NOSEC
1
2
NOCOP
1
1
ROMON
1
Bit 0
EEON
1
Read:
Write:
Reset:
EE3
0
Figure 5-3. Configuration Control Register (CONFIG)
EE[3:0] — EEPROM Mapping Bits
EE[3:0] apply only to MC68HC811E2. Refer to Section 2. Operating Modes
and On-Chip Memory.
NOSEC — Security Mode Disable Bit
Refer to Section 2. Operating Modes and On-Chip Memory.
NOCOP — COP System Disable Bit
0 = COP enabled (forces reset on timeout)
1 = COP disabled (does not force reset on timeout)
ROMON — ROM (EPROM) Enable Bit
Refer to Section 2. Operating Modes and On-Chip Memory.
EEON — EEPROM Enable Bit
Refer to Section 2. Operating Modes and On-Chip Memory.
5.3 Effects of Reset
When a reset condition is recognized, the internal registers and control bits are
forced to an initial state. Depending on the cause of the reset and the operating
mode, the reset vector can be fetched from any of six possible locations. Refer to
Table 5-2.
Table 5-2. Reset Cause, Reset Vector, and Operating Mode
Normal Mode
Vector
Special Test
or Bootstrap
Cause of Reset
POR or RESET pin
Clock monitor failure
COP Watchdog Timeout
$FFFE, FFFF
$FFFC, FFFD
$FFFA, FFFB
$BFFE, $BFFF
$BFFC, $BFFD
$BFFA, $BFFB
These initial states then control on-chip peripheral systems to force them to known
startup states, as described in the following subsections.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
93
Resets and Interrupts
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Resets and Interrupts
5.3.1 Central Processor Unit (CPU)
After reset, the central processor unit (CPU) fetches the restart vector from the
appropriate address during the first three cycles and begins executing instructions.
The stack pointer and other CPU registers are indeterminate immediately after
reset; however, the X and I interrupt mask bits in the condition code register (CCR)
are set to mask any interrupt requests. Also, the S bit in the CCR is set to inhibit
stop mode.
5.3.2 Memory Map
After reset, the INIT register is initialized to $01, mapping the RAM at $00 and the
control registers at $1000.
For the MC68HC811E2, the CONFIG register resets to $FF. EEPROM mapping
bits (EE[3:0]) place the EEPROM at $F800. Refer to the memory map diagram for
MC68HC811E2 in Section 2. Operating Modes and On-Chip Memory.
5.3.3 Timer
During reset, the timer system is initialized to a count of $0000. The prescaler bits
are cleared, and all output compare registers are initialized to $FFFF. All input
capture registers are indeterminate after reset. The output compare 1 mask
(OC1M) register is cleared so that successful OC1 compares do not affect any I/O
pins. The other four output compares are configured so that they do not affect any
I/O pins on successful compares. All input capture edge-detector circuits are
configured for capture disabled operation. The timer overflow interrupt flag and all
eight timer function interrupt flags are cleared. All nine timer interrupts are disabled
because their mask bits have been cleared.
The I4/O5 bit in the PACTL register is cleared to configure the I4/O5 function as
OC5; however, the OM5:OL5 control bits in the TCTL1 register are clear so OC5
does not control the PA3 pin.
5.3.4 Real-Time Interrupt (RTI)
The real-time interrupt flag (RTIF) is cleared and automatic hardware interrupts are
masked. The rate control bits are cleared after reset and can be initialized by
software before the real-time interrupt (RTI) system is used.
5.3.5 Pulse Accumulator
The pulse accumulator system is disabled at reset so that the pulse accumulator
input (PAI) pin defaults to being a general-purpose input pin.
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Effects of Reset
5.3.6 Computer Operating Properly (COP)
The COP watchdog system is enabled if the NOCOP control bit in the CONFIG
register is cleared and disabled if NOCOP is set. The COP rate is set for the
shortest duration timeout.
5.3.7 Serial Communications Interface (SCI)
The reset condition of the SCI system is independent of the operating mode. At
reset, the SCI baud rate control register (BAUD) is initialized to $04. All transmit
and receive interrupts are masked and both the transmitter and receiver are
disabled so the port pins default to being general-purpose I/O lines. The SCI frame
format is initialized to an 8-bit character size. The send break and receiver wakeup
functions are disabled. The TDRE and TC status bits in the SCI status register
(SCSR) are both 1s, indicating that there is no transmit data in either the transmit
data register or the transmit serial shift register. The RDRF, IDLE, OR, NF, FE, PF,
and RAF receive-related status bits in the SCI control register 2 (SCCR2) are
cleared.
5.3.8 Serial Peripheral Interface (SPI)
The SPI system is disabled by reset. The port pins associated with this function
default to being general-purpose I/O lines.
5.3.9 Analog-to-Digital (A/D) Converter
The analog-to-digital (A/D) converter configuration is indeterminate after reset. The
ADPU bit is cleared by reset, which disables the A/D system. The conversion
complete flag is indeterminate.
5.3.10 System
The EEPROM programming controls are disabled, so the memory system is
configured for normal read operation. PSEL[3:0] are initialized with the value
%0110, causing the external IRQ pin to have the highest I-bit interrupt priority. The
IRQ pin is configured for level-sensitive operation (for wired-OR systems). The
RBOOT, SMOD, and MDA bits in the HPRIO register reflect the status of the
MODB and MODA inputs at the rising edge of reset. MODA and MODB inputs
select one of the four operating modes. After reset, writing SMOD and MDA in
special modes causes the MCU to change operating modes. Refer to the
description of HPRIO register in Section 2. Operating Modes and On-Chip
Memory for a detailed description of SMOD and MDA. The DLY control bit is set
to specify that an oscillator startup delay is imposed upon recovery from stop
mode. The clock monitor system is disabled because CME is cleared.
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5.4 Reset and Interrupt Priority
Resets and interrupts have a hardware priority that determines which reset or
interrupt is serviced first when simultaneous requests occur. Any maskable
interrupt can be given priority over other maskable interrupts.
The first six interrupt sources are not maskable. The priority arrangement for these
sources is:
1. POR or RESET pin
2. Clock monitor reset
3. COP watchdog reset
4. XIRQ interrupt
5. Illegal opcode interrupt
6. Software interrupt (SWI)
The maskable interrupt sources have this priority arrangement:
1. IRQ
2. Real-time interrupt
3. Timer input capture 1
4. Timer input capture 2
5. Timer input capture 3
6. Timer output compare 1
7. Timer output compare 2
8. Timer output compare 3
9. Timer output compare 4
10. Timer input capture 4/output compare 5
11. Timer overflow
12. Pulse accumulator overflow
13. Pulse accumulator input edge
14. SPI transfer complete
15. SCI system (refer to Figure 5-7)
Any one of these interrupts can be assigned the highest maskable interrupt priority
by writing the appropriate value to the PSEL bits in the HPRIO register. Otherwise,
the priority arrangement remains the same. An interrupt that is assigned highest
priority is still subject to global masking by the I bit in the CCR, or by any associated
local bits. Interrupt vectors are not affected by priority assignment. To avoid race
conditions, HPRIO can be written only while I-bit interrupts are inhibited.
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Resets and Interrupts
Reset and Interrupt Priority
5.4.1 Highest Priority Interrupt and Miscellaneous Register
Address:
$103C
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
RBOOT(1) SMOD(1)
MDA(1)
IRVNE
PSEL2
PSEL2
PSEL1
PSEL0
Reset:
Single chip:
Expanded:
Bootstrap:
0
0
1
0
0
0
1
1
0
1
0
1
0
0
0
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
Special test:
1. The values of the RBOOT, SMOD, and MDA reset bits depend on the mode selected at the
RESET pin rising edge. Refer to Table 2-1. Hardware Mode Select Summary.
Figure 5-4. Highest Priority I-Bit Interrupt
and Miscellaneous Register (HPRIO)
RBOOT — Read Bootstrap ROM Bit
Has meaning only when the SMOD bit is a 1 (bootstrap mode or special test
mode). At all other times this bit is clear and cannot be written. Refer to Section
2. Operating Modes and On-Chip Memory for more information.
SMOD — Special Mode Select Bit
This bit reflects the inverse of the MODB input pin at the rising edge of reset.
Refer to Section 2. Operating Modes and On-Chip Memory for more
information.
MDA — Mode Select A Bit
The mode select A bit reflects the status of the MODA input pin at the rising
edge of reset. Refer to Section 2. Operating Modes and On-Chip Memory for
more information.
IRVNE — Internal Read Visibility/Not E Bit
The IRVNE control bit allows internal read accesses to be available on the
external data bus during operation in expanded modes. In single-chip and
bootstrap modes, IRVNE determines whether the E clock is driven out an
external pin. For the MC68HC811E2, this bit is IRV and only controls internal
read visibility. Refer to Section 2. Operating Modes and On-Chip Memory for
more information.
PSEL[3:0] — Priority Select Bits
These bits select one interrupt source to be elevated above all other I-bit-related
sources and can be written only while the I bit in the CCR is set (interrupts
disabled).
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Table 5-3. Highest Priority Interrupt Selection
PSEL[3:0]
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
Interrupt Source Promoted
Timer overflow
Pulse accumulator overflow
Pulse accumulator input edge
SPI serial transfer complete
SCI serial system
Reserved (default to IRQ)
IRQ (external pin or parallel I/O)
Real-time interrupt
Timer input capture 1
Timer input capture 2
Timer input capture 3
Timer output compare 1
Timer output compare 2
Timer output compare 3
Timer output compare 4
Timer input capture 4/output compare 5
5.5 Interrupts
The MCU has 18 interrupt vectors that support 22 interrupt sources. The 15
maskable interrupts are generated by on-chip peripheral systems. These interrupts
are recognized when the global interrupt mask bit (I) in the condition code register
(CCR) is clear. The three non-maskable interrupt sources are illegal opcode trap,
software interrupt, and XIRQ pin. Refer to Table 5-4, which shows the interrupt
sources and vector assignments for each source.
For some interrupt sources, such as the SCI interrupts, the flags are automatically
cleared during the normal course of responding to the interrupt requests. For
example, the RDRF flag in the SCI system is cleared by the automatic clearing
mechanism consisting of a read of the SCI status register while RDRF is set,
followed by a read of the SCI data register. The normal response to an RDRF
interrupt request would be to read the SCI status register to check for receive
errors, then to read the received data from the SCI data register. These steps
satisfy the automatic clearing mechanism without requiring special instructions.
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Interrupts
Table 5-4. Interrupt and Reset Vector Assignments
CCR
Mask Bit
Local
Mask
Vector Address
Interrupt Source
FFC0, C1 – FFD4, D5 Reserved
SCI serial system
—
—
• SCI receive data register full
• SCI receiver overrun
• SCI transmit data register empty
• SCI transmit complete
RIE
RIE
TIE
TCIE
ILIE
FFD6, D7
I
• SCI idle line detect
FFD8, D9
FFDA, DB
FFDC, DD
FFDE, DF
FFE0, E1
FFE2, E3
FFE4, E5
FFE6, E7
FFE8, E9
FFEA, EB
FFEC, ED
FFEE, EF
FFF0, F1
FFF2, F3
FFF4, F5
FFF6, F7
FFF8, F9
FFFA, FB
FFFC, FD
FFFE, FF
SPI serial transfer complete
Pulse accumulator input edge
Pulse accumulator overflow
Timer overflow
I
SPIE
PAII
I
I
PAOVI
TOI
I
Timer input capture 4/output compare 5
Timer output compare 4
Timer output compare 3
Timer output compare 2
Timer output compare 1
Timer input capture 3
Timer input capture 2
Timer input capture 1
Real-time interrupt
I
I4/O5I
OC4I
OC3I
OC2I
OC1I
IC3I
I
I
I
I
I
I
IC2I
I
IC1I
I
RTII
IRQ (external pin)
I
None
None
None
None
NOCOP
CME
None
XIRQ pin
X
Software interrupt
None
None
None
None
None
Illegal opcode trap
COP failure
Clock monitor fail
RESET
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5.5.1 Interrupt Recognition and Register Stacking
An interrupt can be recognized at any time after it is enabled by its local mask, if
any, and by the global mask bit in the CCR. Once an interrupt source is recognized,
the CPU responds at the completion of the instruction being executed. Interrupt
latency varies according to the number of cycles required to complete the current
instruction. When the CPU begins to service an interrupt, the contents of the CPU
registers are pushed onto the stack in the order shown in Table 5-5. After the CCR
value is stacked, the I bit and the X bit, if XIRQ is pending, are set to inhibit further
interrupts. The interrupt vector for the highest priority pending source is fetched
and execution continues at the address specified by the vector. At the end of the
interrupt service routine, the return-from-interrupt instruction is executed and the
saved registers are pulled from the stack in reverse order so that normal program
execution can resume. Refer to Section 4. Central Processor Unit (CPU).
Table 5-5. Stacking Order on Entry to Interrupts
Memory Location
SP
CPU Registers
PCL
SP–1
PCH
SP–2
IYL
SP–3
IYH
SP–4
IXL
SP–5
IXH
SP–6
ACCA
ACCB
CCR
SP–7
SP–8
5.5.2 Non-Maskable Interrupt Request (XIRQ)
Non-maskable interrupts are useful because they can always interrupt CPU
operations. The most common use for such an interrupt is for serious system
problems, such as program runaway or power failure. The XIRQ input is an
updated version of the NMI (non-maskable interrupt) input of earlier MCUs.
Upon reset, both the X bit and I bit of the CCR are set to inhibit all maskable
interrupts and XIRQ. After minimum system initialization, software can clear the X
bit by a TAP instruction, enabling XIRQ interrupts. Thereafter, software cannot set
the X bit. Thus, an XIRQ interrupt is a non-maskable interrupt. Because the
operation of the I-bit-related interrupt structure has no effect on the X bit, the
internal XIRQ pin remains unmasked. In the interrupt priority logic, the XIRQ
interrupt has a higher priority than any source that is maskable by the I bit. All
I-bit-related interrupts operate normally with their own priority relationship.
When an I-bit-related interrupt occurs, the I bit is automatically set by hardware
after stacking the CCR byte. The X bit is not affected. When an X-bit-related
interrupt occurs, both the X and I bits are automatically set by hardware after
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Interrupts
stacking the CCR. A return-from-interrupt instruction restores the X and I bits to
their pre-interrupt request state.
5.5.3 Illegal Opcode Trap
Because not all possible opcodes or opcode sequences are defined, the MCU
includes an illegal opcode detection circuit, which generates an interrupt request.
When an illegal opcode is detected and the interrupt is recognized, the current
value of the program counter is stacked. After interrupt service is complete,
reinitialize the stack pointer so repeated execution of illegal opcodes does not
cause stack underflow. Left uninitialized, the illegal opcode vector can point to a
memory location that contains an illegal opcode. This condition causes an infinite
loop that causes stack underflow. The stack grows until the system crashes.
The illegal opcode trap mechanism works for all unimplemented opcodes on all
four opcode map pages. The address stacked as the return address for the illegal
opcode interrupt is the address of the first byte of the illegal opcode. Otherwise, it
would be almost impossible to determine whether the illegal opcode had been one
or two bytes. The stacked return address can be used as a pointer to the illegal
opcode so the illegal opcode service routine can evaluate the offending opcode.
5.5.4 Software Interrupt (SWI)
SWI is an instruction, and thus cannot be interrupted until complete. SWI is not
inhibited by the global mask bits in the CCR. Because execution of SWI sets the I
mask bit, once an SWI interrupt begins, other interrupts are inhibited until SWI is
complete, or until user software clears the I bit in the CCR.
5.5.5 Maskable Interrupts
The maskable interrupt structure of the MCU can be extended to include additional
external interrupt sources through the IRQ pin. The default configuration of this pin
is a low-level sensitive wired-OR network. When an event triggers an interrupt, a
software accessible interrupt flag is set. When enabled, this flag causes a constant
request for interrupt service. After the flag is cleared, the service request is
released.
5.5.6 Reset and Interrupt Processing
Figure 5-5 and Figure 5-6 illustrate the reset and interrupt process. Figure 5-5
illustrates how the CPU begins from a reset and how interrupt detection relates to
normal opcode fetches. Figure 5-6 is an expansion of a block in Figure 5-5 and
illustrates interrupt priorities. Figure 5-7 shows the resolution of interrupt sources
within the SCI subsystem.
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HIGHEST
PRIORITY
POWER-ON RESET
(POR)
DELAY 4064 E CYCLES
EXTERNAL RESET
CLOCK MONITOR FAIL
(WITH CME = 1)
LOWEST
PRIORITY
COP WATCHDOG
TIMEOUT
(WITH NOCOP = 0)
LOAD PROGRAM COUNTER
WITH CONTENTS OF
$FFFE, $FFFF
(VECTOR FETCH)
LOAD PROGRAM COUNTER
WITH CONTENTS OF
$FFFC, $FFFD
LOAD PROGRAM COUNTER
WITH CONTENTS OF
$FFFA, $FFFB
(VECTOR FETCH)
(VECTOR FETCH)
SET BITS S, I, AND X
RESET MCU
HARDWARE
BEGIN INSTRUCTION
SEQUENCE
1A
BIT X IN
CCR = 1?
Y
N
XIRQ
PIN LOW?
Y
STACK CPU
REGISTERS
N
SET BITS I AND X
FETCH VECTOR
$FFF4, $FFF5
2A
Figure 5-5. Processing Flow Out of Reset (Sheet 1 of 2)
Data Sheet
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Resets and Interrupts
Interrupts
2A
Y
BIT I IN
CCR = 1?
N
ANY I-BIT
INTERRUPT
PENDING?
Y
STACK CPU
REGISTERS
N
FETCH OPCODE
Y
ILLEGAL
OPCODE?
STACK CPU
REGISTERS
N
SET BIT I IN CCR
WAI
INSTRUCTION?
FETCH VECTOR
$FFF8, $FFF9
Y
STACK CPU
REGISTERS
N
SWI
INSTRUCTION?
Y
Y
ANY
INTERRUPT
PENDING?
STACK CPU
REGISTERS
N
N
SET BIT I IN CCR
Y
FETCH VECTOR
$FFF6, $FFF7
SET BIT I IN CCR
RTI
INSTRUCTION?
RESOLVE INTERRUPT
PRIORITY AND FETCH
VECTOR FOR HIGHEST
PENDING SOURCE
SEE FIGURE 5–2
N
RESTORE CPU
REGISTERS
FROM STACK
EXECUTE THIS
INSTRUCTION
1A
Figure 5-5. Processing Flow Out of Reset (Sheet 2 of 2)
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BEGIN
X BIT
IN CCR
SET ?
YES
YES
YES
YES
XIRQ PIN
LOW ?
SET X BIT IN CCR
FETCH VECTOR
$FFF4, FFF5
NO
NO
HIGHEST
PRIORITY
INTERRUPT
?
FETCH VECTOR
NO
FETCH VECTOR
$FFF2, FFF3
IRQ ?
NO
YES
YES
YES
YES
YES
YES
YES
YES
REAL-TIME
INTERRUPT
?
FETCH VECTOR
$FFF0, FFF1
RTII = 1 ?
NO
NO
FETCH VECTOR
$FFEE, FFEF
TIMER
IC1F ?
IC1I = 1 ?
NO
NO
FETCH VECTOR
$FFEC, FFED
TIMER
IC2F ?
IC2I = 1 ?
NO
NO
YES
YES
FETCH VECTOR
$FFEA, FFEB
TIMER
IC3F ?
IC3I = 1 ?
NO
NO
FETCH VECTOR
$FFE8, FFE9
TIMER
OC1F ?
OC1I = 1 ?
NO
NO
2A
2B
Figure 5-6. Interrupt Priority Resolution (Sheet 1 of 2)
Data Sheet
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Resets and Interrupts
Interrupts
2A
2B
Y
Y
FLAG
OC2F = 1?
FETCH VECTOR
$FFE6, $FFE7
OC2I = 1?
N
N
Y
Y
Y
Y
FLAG
OC3F = 1
FETCH VECTOR
$FFE4, $FFE5
OC3I = 1?
N
N
FLAG
OC4F = 1?
FETCH VECTOR
$FFE2, $FFE3
OC4I = 1?
N
N
Y
Y
Y
Y
FLAG
I4/O5IF = 1?
FETCH VECTOR
$FFE0, $FFE1
I4/O5I = 1?
N
N
FLAG
TOF = 1?
FETCH VECTOR
$FFDE, $FFDF
TOI = 1?
N
N
Y
Y
Y
Y
FLAG
PAOVF = 1
FETCH VECTOR
$FFDC, $FFDD
PAOVI = 1?
N
N
FLAG
PAIF = 1?
FETCH VECTOR
$FFDA, $FFDB
PAII = 1?
N
N
FLAGS
SPIF = 1? OR
MODF = 1?
Y
Y
Y
FETCH VECTOR
$FFD8, $FFD9
SPIE = 1?
N
N
SCI
FETCH VECTOR
$FFD6, $FFD7
INTERRUPT?
SEE FIGURE
5–3
FETCH VECTOR
$FFF2, $FFF3
N
END
Figure 5-6. Interrupt Priority Resolution (Sheet 2 of 2)
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Resets and Interrupts
BEGIN
Y
Y
FLAG
RDRF = 1?
N
Y
Y
Y
Y
OR = 1?
N
RIE = 1?
N
RE = 1?
N
Y
Y
Y
Y
TDRE = 1?
N
TE = 1?
N
TIE = 1?
N
TC = 1?
N
TCIE = 1?
N
Y
Y
IDLE = 1?
RE = 1?
N
ILIE = 1?
N
N
NO
VALID SCI REQUEST
VALID SCI REQUEST
Figure 5-7. Interrupt Source Resolution Within SCI
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Low-Power Operation
5.6 Low-Power Operation
Both stop mode and wait mode suspend CPU operation until a reset or interrupt
occurs. Wait mode suspends processing and reduces power consumption to an
intermediate level. Stop mode turns off all on-chip clocks and reduces power
consumption to an absolute minimum while retaining the contents of the entire
RAM array.
5.6.1 Wait Mode
The WAI opcode places the MCU in wait mode, during which the CPU registers are
stacked and CPU processing is suspended until a qualified interrupt is detected.
The interrupt can be an external IRQ, an XIRQ, or any of the internally generated
interrupts, such as the timer or serial interrupts. The on-chip crystal oscillator
remains active throughout the wait standby period.
The reduction of power in the wait condition depends on how many internal clock
signals driving on-chip peripheral functions can be shut down. The CPU is always
shut down during wait. While in the wait state, the address/data bus repeatedly
runs read cycles to the address where the CCR contents were stacked. The MCU
leaves the wait state when it senses any interrupt that has not been masked.
The free-running timer system is shut down only if the I bit is set to 1 and the COP
system is disabled by NOCOP being set to 1. Several other systems also can be
in a reduced power-consumption state depending on the state of
software-controlled configuration control bits. Power consumption by the
analog-to-digital (A/D) converter is not affected significantly by the wait condition.
However, the A/D converter current can be eliminated by writing the ADPU bit to 0.
The SPI system is enabled or disabled by the SPE control bit. The SCI transmitter
is enabled or disabled by the TE bit, and the SCI receiver is enabled or disabled by
the RE bit. Therefore, the power consumption in wait is dependent on the particular
application.
5.6.2 Stop Mode
Executing the STOP instruction while the S bit in the CCR is equal to 0 places the
MCU in stop mode. If the S bit is not 0, the stop opcode is treated as a no-op (NOP).
Stop mode offers minimum power consumption because all clocks, including the
crystal oscillator, are stopped while in this mode. To exit stop and resume normal
processing, a logic low level must be applied to one of the external interrupts (IRQ
or XIRQ) or to the RESET pin. A pending edge-triggered IRQ can also bring the
CPU out of stop.
Because all clocks are stopped in this mode, all internal peripheral functions also
stop. The data in the internal RAM is retained as long as VDD power is maintained.
The CPU state and I/O pin levels are static and are unchanged by stop. Therefore,
when an interrupt comes to restart the system, the MCU resumes processing as if
there were no interruption. If reset is used to restart the system, a normal reset
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sequence results in which all I/O pins and functions are also restored to their initial
states.
To use the IRQ pin as a means of recovering from stop, the I bit in the CCR must
be clear (IRQ not masked). The XIRQ pin can be used to wake up the MCU from
stop regardless of the state of the X bit in the CCR, although the recovery sequence
depends on the state of the X bit. If X is set to 0 (XIRQ not masked), the MCU starts
up, beginning with the stacking sequence leading to normal service of the XIRQ
request. If X is set to 1 (XIRQ masked or inhibited), then processing continues with
the instruction that immediately follows the STOP instruction, and no XIRQ
interrupt service is requested or pending.
Because the oscillator is stopped in stop mode, a restart delay may be imposed to
allow oscillator stabilization upon leaving stop. If the internal oscillator is being
used, this delay is required; however, if a stable external oscillator is being used,
the DLY control bit can be used to bypass this startup delay. The DLY control bit is
set by reset and can be optionally cleared during initialization. If the DLY equal to
0 option is used to avoid startup delay on recovery from stop, then reset should not
be used as the means of recovering from stop, as this causes DLY to be set again
by reset, imposing the restart delay. This same delay also applies to power-on
reset, regardless of the state of the DLY control bit, but does not apply to a reset
while the clocks are running.
Data Sheet
108
M68HC11E Family — Rev. 5
Resets and Interrupts
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Data Sheet — M68HC11E Family
Section 6. Parallel Input/Output (I/O) Ports
6.1 Introduction
All M68HC11 E-series MCUs have five input/output (I/O) ports and up to 38 I/O
lines, depending on the operating mode. Refer to Table 6-1 for a summary of the
ports and their shared functions.
Table 6-1. Input/Output Ports
Input
Pins
Output
Pins
Bidirectional
Pins
Port
Shared Functions
Port A
Port B
Port C
3
3
8
2
—
8
Timer
—
—
High-order address
—
Low-order address and data bus
Serial communications interface (SCI)
and serial peripheral interface (SPI)
Port D
Port E
—
8
—
—
6
—
Analog-to-digital (A/D) converter
Port pin function is mode dependent. Do not confuse pin function with the electrical
state of the pin at reset. Port pins are either driven to a specified logic level or are
configured as high-impedance inputs. I/O pins configured as high-impedance
inputs have port data that is indeterminate.
In port descriptions, an I indicates this condition. Port pins that are driven to a
known logic level during reset are shown with a value of either 1 or 0. Some control
bits are unaffected by reset. Reset states for these bits are indicated with a U.
6.2 Port A
Port A shares functions with the timer system and has:
•
•
•
Three input-only pins
Three output-only pins
Two bidirectional I/O pins
M68HC11E Family — Rev. 5
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Data Sheet
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Parallel Input/Output (I/O) Ports
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Parallel Input/Output (I/O) Ports
Address:
$1000
Bit 7
6
5
4
3
2
1
Bit 0
PA0
Read:
Write:
PA7
PA6
PA5
PA4
PA3
PA2
PA1
Reset:
I
0
0
0
I
I
I
I
Alternate function:
And/or:
PAI
OC1
OC2
OC1
OC3
OC1
OC4
OC1
IC4/OC5
OC1
IC1
—
IC2
—
IC3
—
I = Indeterminate after reset
Figure 6-1. Port A Data Register (PORTA)
Address:
$1026
Bit 7
DDRA7
0
6
PAEWN
0
5
PAMOD
0
4
PEDGE
0
3
DDRA3
0
2
I4/O5
0
1
RTR1
0
Bit 0
RTR0
0
Read:
Write:
Reset:
Figure 6-2. Pulse Accumulator Control Register (PACTL)
DDRA7 — Data Direction for Port A Bit 7
Overridden if an output compare function is configured to control the PA7 pin
0 = Input
1 = Output
The pulse accumulator uses port A bit 7 as the PAI input, but the pin can also
be used as general-purpose I/O or as an output compare.
NOTE:
Even when port A bit 7 is configured as an output, the pin still drives the input to
the pulse accumulator.
PAEN — Pulse Accumulator System Enable Bit
Refer to Section 9. Timing System.
PAMOD — Pulse Accumulator Mode Bit
Refer to Section 9. Timing System.
PEDGE — Pulse Accumulator Edge Control Bit
Refer to Section 9. Timing System.
DDRA3 — Data Direction for Port A Bit 3
This bit is overridden if an output compare function is configured to control the
PA3 pin.
0 = Input
1 = Output
I4/O5 — Input Capture 4/Output Compare 5 Bit
Refer to Section 9. Timing System.
RTR[1:0] — RTI Interrupt Rate Select Bits
Refer to Section 9. Timing System.
Data Sheet
110
M68HC11E Family — Rev. 5
Parallel Input/Output (I/O) Ports
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Parallel Input/Output (I/O) Ports
Port B
6.3 Port B
In single-chip or bootstrap modes, port B pins are general-purpose outputs. In
expanded or special test modes, port B pins are high-order address outputs.
Address:
$1004
Bit 7
6
5
4
3
2
1
Bit 0
Single-chip or bootstrap modes:
Read:
PB7
0
PB6
PB5
0
PB4
0
PB3
0
PB2
0
PB1
0
PB0
0
Write:
Reset:
0
Expanded or special test modes:
Read:
ADDR15
0
ADDR14
ADDR13
0
ADDR12
0
ADDR11
0
ADDR10
0
ADDR9
0
ADDR8
0
Write:
Reset:
0
Figure 6-3. Port B Data Register (PORTB)
6.4 Port C
In single-chip and bootstrap modes, port C pins reset to high-impedance inputs.
(DDRC bits are set to 0.) In expanded and special test modes, port C pins are
multiplexed address/data bus and the port C register address is treated as an
external memory location.
Address:
$1003
Bit 7
6
5
4
3
2
1
Bit 0
PC0
Single-chip or bootstrap modes:
Read:
PC7
PC6
PC5
PC4
PC3
PC2
PC1
Write:
Reset:
Indeterminate after reset
Expanded or special test modes:
Read:
ADDR7
DATA7
ADDR6
DATA6
ADDR5
DATA5
ADDR4
DATA4
ADDR3
DATA3
ADDR2
DATA2
ADDR1
DATA1
ADDR0
DATA0
Write:
Reset:
Indeterminate after reset
Figure 6-4. Port C Data Register (PORTC)
M68HC11E Family — Rev. 5
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Data Sheet
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Parallel Input/Output (I/O) Ports
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Parallel Input/Output (I/O) Ports
Address:
$1005
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
PCL7
PCL6
PCL5
PCL4
PCL3
PCL2
PCL1
PCL0
Indeterminate after reset
Figure 6-5. Port C Latched Register (PORTCL)
PORTCL is used in the handshake clearing mechanism. When an active edge
occurs on the STRA pin, port C data is latched into the PORTCL register. Reads
of this register return the last value latched into PORTCL and clear STAF flag
(following a read of PIOC with STAF set).
Address:
$1007
Bit 7
6
DDRC6
0
5
DDRC5
0
4
DDRC4
0
3
DDRC3
0
2
DDRC2
0
1
DDRC1
0
Bit 0
DDRC0
0
Read:
Write:
Reset:
DDRC7
0
Figure 6-6. Port C Data Direction Register (DDRC)
DDRC[7:0] — Port C Data Direction Bits
In handshake output mode, DDRC bits select the 3-stated output option
(DDCx = 1).
0 = Input
1 = Output
6.5 Port D
In all modes, port D bits [5:0] can be used either for general-purpose I/O or with the
serial communications interface (SCI) and serial peripheral interface (SPI)
subsystems. During reset, port D pins PD[5:0] are configured as high-impedance
inputs (DDRD bits cleared).
Address:
$1008
Bit 7
6
0
5
PD5
I
4
PD4
I
3
PD3
I
2
PD2
I
1
PD1
I
Bit 0
PD0
I
Read:
Write:
Reset:
0
—
—
—
—
PD5
SS
PD4
SCK
PD3
MOSI
PD2
MISO
PD1
Tx
PD0
RxD
Alternate Function:
I = Indeterminate after reset
Figure 6-7. Port D Data Register (PORTD)
Data Sheet
112
M68HC11E Family — Rev. 5
MOTOROLA
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Parallel Input/Output (I/O) Ports
Port E
Address:
$1009
Bit 7
6
0
5
DDRD5
0
4
DDRD4
0
3
DDRD3
0
2
DDRD2
0
1
DDRD1
0
Bit 0
Read:
Write:
Reset:
DDRD0
0
0
= Unimplemented
Figure 6-8. Port D Data Direction Register (DDRD)
Bits [7:6] — Unimplemented
Always read 0
DDRD[5:0] — Port D Data Direction Bits
When DDRD bit 5 is 1 and MSTR = 1 in SPCR, PD5/SS is a general-purpose
output and mode fault logic is disabled.
0 = Input
1 = Output
6.6 Port E
Port E is used for general-purpose static inputs or pins that share functions with the
analog-to-digital (A/D) converter system. When some port E pins are being used
for general-purpose input and others are being used as A/D inputs, PORTE should
not be read during the sample portion of an A/D conversion.
Address:
$100A
Bit 7
6
5
4
3
2
1
Bit 0
PE0
Read:
Write:
PE7
PE6
PE5
PE4
PE3
PE2
PE1
Reset:
Indeterminate after reset
AN4 AN3
Alternate Function:
AN7
AN6
AN5
AN2
AN1
AN0
Figure 6-9. Port E Data Register (PORTE)
6.7 Handshake Protocol
Simple and full handshake input and output functions are available on ports B and
C pins in single-chip mode. In simple strobed mode, port B is a strobed output port
and port C is a latching input port. The two activities are available simultaneously.
The STRB output is pulsed for two E-clock periods each time there is a write to the
PORTB register. The INVB bit in the PIOC register controls the polarity of STRB
pulses. Port C levels are latched into the alternate port C latch (PORTCL) register
on each assertion of the STRA input. STRA edge select, flag, and interrupt enable
bits are located in the PIOC register. Any or all of the port C lines can still be used
as general-purpose I/O while in strobed input mode.
M68HC11E Family — Rev. 5
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Data Sheet
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Parallel Input/Output (I/O) Ports
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Parallel Input/Output (I/O) Ports
Full handshake modes use port C pins and the STRA and STRB lines. Input and
output handshake modes are supported, and output handshake mode has a
3-stated variation. STRA is an edge-detecting input and STRB is a handshake
output. Control and enable bits are located in the PIOC register.
In full input handshake mode, the MCU asserts STRB to signal an external system
that it is ready to latch data. Port C logic levels are latched into PORTCL when the
STRA line is asserted by the external system. The MCU then negates STRB. The
MCU reasserts STRB after the PORTCL register is read. In this mode, a mix of
latched inputs, static inputs, and static outputs is allowed on port C, differentiated
by the data direction bits and use of the PORTC and PORTCL registers.
In full output handshake mode, the MCU writes data to PORTCL which, in turn,
asserts the STRB output to indicate that data is ready. The external system reads
port C data and asserts the STRA input to acknowledge that data has been
received.
In the 3-state variation of output handshake mode, lines intended as 3-state
handshake outputs are configured as inputs by clearing the corresponding DDRC
bits. The MCU writes data to PORTCL and asserts STRB. The external system
responds by activating the STRA input, which forces the MCU to drive the data in
PORTC out on all of the port C lines. After the trailing edge of the active signal on
STRA, the MCU negates the STRB signal. The 3-state mode variation does not
allow part of port C to be used for static inputs while other port C pins are being
used for handshake outputs. Refer to the 6.8 Parallel I/O Control Register for
further information.
6.8 Parallel I/O Control Register
The parallel handshake functions are available only in the single-chip operating
mode. PIOC is a read/write register except for bit 7, which is read only. Table 6-2
shows a summary of handshake operations.
Table 6-2. Parallel I/O Control
STAF
Clearing
Sequence
HNDS OIN
PLS
EGA
Port B
Port C
Read
Inputs latched into
PORTCL on any
active edge on
STRA
Simple
strobed
mode
PIOC with
STAF = 1
then read
PORTCL
STRB pulses
on writes
to PORTB
0
1
0
1
X
0
X
Read
Full-input
hand-
shake
0 = STRB
active level
1 = STRB
active pulse
Inputs latched into Normal output
PIOC with
STAF = 1
then read
PORTCL
1
0
PORTCL on any
active edge on
STRA
port, unaffected
in handshake
modes
mode
Data Sheet
114
M68HC11E Family — Rev. 5
MOTOROLA
Parallel Input/Output (I/O) Ports
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Parallel Input/Output (I/O) Ports
Parallel I/O Control Register
Table 6-2. Parallel I/O Control (Continued)
STAF
Clearing
Sequence
HNDS OIN
PLS
EGA
Port B
Port C
Driven as outputs if
STRA at active
level; follows
DDRC
if STRA not at
active level
Full-
Read
0 = STRB
active level
1 = STRB
active pulse
0
1
Normal output
port, unaffected
in handshake
modes
output
hand-
shake
mode
PIOC with
STAF = 1
then write
PORTCL
Port C
Driven
1
1
STRA
Active Edge
Follow
DDRC
Follow
DDRC
Address:
$1002
Bit 7
STAF
0
6
STAI
0
5
CWOM
0
4
HNDS
0
3
2
PLS
U
1
EGA
1
Bit 0
INVB
1
Read:
Write:
Reset:
OIN
0
U = Unaffected
Figure 6-10. Parallel I/O Control Register (PIOC)
STAF — Strobe A Interrupt Status Flag
STAF is set when the selected edge occurs on strobe A. This bit can be cleared
by a read of PIOC with STAF set followed by a read of PORTCL (simple strobed
or full input handshake mode) or a write to PORTCL (output handshake mode).
0 = No edge on strobe A
1 = Selected edge on strobe A
STAI — Strobe A Interrupt Enable Mask Bit
0 = STAF does not request interrupt
1 = STAF requests interrupt
CWOM — Port C Wired-OR Mode Bit (affects all eight port C pins)
It is customary to have an external pullup resistor on lines that are driven by
open-drain devices.
0 = Port C outputs are normal CMOS outputs.
1 = Port C outputs are open-drain outputs.
HNDS — Handshake Mode Bit
0 = Simple strobe mode
1 = Full input or output handshake mode
OIN — Output or Input Handshake Select Bit
HNDS must be set to 1 for this bit to have meaning.
0 = Input handshake
1 = Output handshake
M68HC11E Family — Rev. 5
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Data Sheet
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Parallel Input/Output (I/O) Ports
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Parallel Input/Output (I/O) Ports
PLS — Pulsed/Interlocked Handshake Operation Bit
HNDS must be set to 1 for this bit to have meaning. When interlocked
handshake is selected, strobe B is active until the selected edge of strobe A is
detected.
0 = Interlocked handshake
1 = Pulsed handshake (Strobe B pulses high for two E-clock cycles.)
EGA — Active Edge for Strobe A Bit
0 = STRA falling edge selected, high level activates port C outputs (output
handshake)
1 = STRA rising edge selected, low level activates port C outputs (output
handshake)
INVB — Invert Strobe B Bit
0 = Active level is logic 0.
1 = Active level is logic 1.
Data Sheet
116
M68HC11E Family — Rev. 5
Parallel Input/Output (I/O) Ports
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Data Sheet — M68HC11E Family
Section 7. Serial Communications Interface (SCI)
7.1 Introduction
The serial communications interface (SCI) is a universal asynchronous receiver
transmitter (UART), one of two independent serial input/output (I/O) subsystems in
the M68HC11 E series of microcontrollers. It has a standard non-return-to-zero
(NRZ) format (one start bit , eight or nine data bits, and one stop bit). Several baud
rates are available. The SCI transmitter and receiver are independent, but use the
same data format and bit rate.
All members of the E series contain the same SCI, with one exception. The SCI
system in the MC68HC11E20 and MC68HC711E20 MCUs have an enhanced SCI
baud rate generator. A divide-by-39 stage has been added that is enabled by an
extra bit in the BAUD register. This increases the available SCI baud rate
selections. Refer to Figure 7-8 and 7.7.5 Baud Rate Register.
7.2 Data Format
The serial data format requires these conditions:
1. An idle line in the high state before transmission or reception of a message
2. A start bit, logic 0, transmitted or received, that indicates the start of each
character
3. Data that is transmitted and received least significant bit (LSB) first
4. A stop bit, logic 1, used to indicate the end of a frame. A frame consists of a
start bit, a character of eight or nine data bits, and a stop bit.
5. A break, defined as the transmission or reception of a logic 0 for some
multiple number of frames
Selection of the word length is controlled by the M bit of SCI control register
(SCCR1).
7.3 Transmit Operation
The SCI transmitter includes a parallel transmit data register (SCDR) and a serial
shift register. The contents of the serial shift register can be written only through
the SCDR. This double buffered operation allows a character to be shifted out
serially while another character is waiting in the SCDR to be transferred into the
M68HC11E Family — Rev. 5
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Data Sheet
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Serial Communications Interface (SCI)
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Serial Communications Interface (SCI)
serial shift register. The output of the serial shift register is applied to TxD as long
as transmission is in progress or the transmit enable (TE) bit of serial
communication control register 2 (SCCR2) is set. The block diagram, Figure 7-1,
shows the transmit serial shift register and the buffer logic at the top of the figure.
WRITE ONLY
TRANSMITTER
BAUD RATE
CLOCK
SCDR Tx BUFFER
DDD1
10 (11) - BIT Tx SHIFT REGISTER
(8) 7 L
SEE NOTE
PD1
TxD
PIN BUFFER
AND CONTROL
H
6
5
4
3
2
1
0
8
FORCE PIN
DIRECTION (OUT)
TRANSMITTER
CONTROL LOGIC
8
SCSR
INTERRUPT STATUS
SCCR1 SCI CONTROL 1
8
TDRE
TIE
TC
TCIE
SCCR2 SCI CONTROL 2
SCI Rx
REQUESTS
SCI INTERRUPT
REQUEST
INTERNAL
DATA BUS
Note: Refer to Figure B-1. EVBU Schematic Diagram for an example of connecting TxD to a PC.
Figure 7-1. SCI Transmitter Block Diagram
Data Sheet
118
M68HC11E Family — Rev. 5
MOTOROLA
Serial Communications Interface (SCI)
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Serial Communications Interface (SCI)
Receive Operation
7.4 Receive Operation
During receive operations, the transmit sequence is reversed. The serial shift
register receives data and transfers it to a parallel receive data register (SCDR) as
a complete word. This double buffered operation allows a character to be shifted
in serially while another character is already in the SCDR. An advanced data
recovery scheme distinguishes valid data from noise in the serial data stream. The
data input is selectively sampled to detect receive data, and a majority voting circuit
determines the value and integrity of each bit. See Figure 7-2.
7.5 Wakeup Feature
The wakeup feature reduces SCI service overhead in multiple receiver systems.
Software for each receiver evaluates the first character of each message. The
receiver is placed in wakeup mode by writing a 1 to the RWU bit in the SCCR2
register. While RWU is 1, all of the receiver-related status flags (RDRF, IDLE, OR,
NF, and FE) are inhibited (cannot become set). Although RWU can be cleared by
a software write to SCCR2, to do so would be unusual. Normally, RWU is set by
software and is cleared automatically with hardware. Whenever a new message
begins, logic alerts the sleeping receivers to wake up and evaluate the initial
character of the new message.
Two methods of wakeup are available:
•
•
Idle-line wakeup
Address-mark wakeup
During idle-line wakeup, a sleeping receiver awakens as soon as the RxD line
becomes idle. In the address-mark wakeup, logic 1 in the most significant bit (MSB)
of a character wakes up all sleeping receivers.
7.5.1 Idle-Line Wakeup
To use the receiver wakeup method, establish a software addressing scheme to
allow the transmitting devices to direct a message to individual receivers or to
groups of receivers. This addressing scheme can take any form as long as all
transmitting and receiving devices are programmed to understand the same
scheme. Because the addressing information is usually the first frame(s) in a
message, receivers that are not part of the current task do not become burdened
with the entire set of addressing frames. All receivers are awake (RWU = 0) when
each message begins. As soon as a receiver determines that the message is not
intended for it, software sets the RWU bit (RWU = 1), which inhibits further flag
setting until the RxD line goes idle at the end of the message. As soon as an idle
line is detected by receiver logic, hardware automatically clears the RWU bit so that
the first frame of the next message can be received. This type of receiver wakeup
requires a minimum of one idle-line frame time between messages and no idle time
between frames in a message.
M68HC11E Family — Rev. 5
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Data Sheet
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Serial Communications Interface (SCI)
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Serial Communications Interface (SCI)
RECEIVER
BAUD RATE
CLOCK
DDD0
÷16
10 (11) - BIT
Rx SHIFT REGISTER
SEE NOTE
PIN BUFFER
AND CONTROL
DATA
RECOVERY
PD0
RxD
(8)
7
6
5
4
3
2
1
0
MSB
ALL 1s
DISABLE
DRIVER
RE
M
WAKEUP
LOGIC
RWU
8
SCCR1 SCI CONTROL 1
SCSR SCI STATUS 1
SCDR Rx BUFFER
READ ONLY
8
RDRF
RIE
IDLE
ILIE
OR
RIE
8
SCCR2 SCI CONTROL 2
SCI Tx
REQUESTS
SCI INTERRUPT
REQUEST
INTERNAL
DATA BUS
Note: Refer to Figure B-1. EVBU Schematic Diagram for an example of connecting RxD to a PC.
Figure 7-2. SCI Receiver Block Diagram
Data Sheet
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M68HC11E Family — Rev. 5
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Serial Communications Interface (SCI)
SCI Error Detection
7.5.2 Address-Mark Wakeup
The serial characters in this type of wakeup consist of seven (eight if M = 1)
information bits and an MSB, which indicates an address character (when set to 1,
or mark). The first character of each message is an addressing character (MSB =
1). All receivers in the system evaluate this character to determine if the remainder
of the message is directed toward this particular receiver. As soon as a receiver
determines that a message is not intended for it, the receiver activates the RWU
function by using a software write to set the RWU bit. Because setting RWU inhibits
receiver-related flags, there is no further software overhead for the rest of this
message.
When the next message begins, its first character has its MSB set, which
automatically clears the RWU bit and enables normal character reception. The first
character whose MSB is set is also the first character to be received after wakeup
because RWU gets cleared before the stop bit for that frame is serially received.
This type of wakeup allows messages to include gaps of idle time, unlike the
idle-line method, but there is a loss of efficiency because of the extra bit time for
each character (address bit) required for all characters.
7.6 SCI Error Detection
Three error conditions – SCDR overrun, received bit noise, and framing – can
occur during generation of SCI system interrupts. Three bits (OR, NF, and FE) in
the serial communications status register (SCSR) indicate if one of these error
conditions exists.
The overrun error (OR) bit is set when the next byte is ready to be transferred from
the receive shift register to the SCDR and the SCDR is already full (RDRF bit is
set). When an overrun error occurs, the data that caused the overrun is lost and
the data that was already in SCDR is not disturbed. The OR is cleared when the
SCSR is read (with OR set), followed by a read of the SCDR.
The noise flag (NF) bit is set if there is noise on any of the received bits, including
the start and stop bits. The NF bit is not set until the RDRF flag is set. The NF bit
is cleared when the SCSR is read (with FE equal to 1) followed by a read of the
SCDR.
When no stop bit is detected in the received data character, the framing error (FE)
bit is set. FE is set at the same time as the RDRF. If the byte received causes both
framing and overrun errors, the processor only recognizes the overrun error. The
framing error flag inhibits further transfer of data into the SCDR until it is cleared.
The FE bit is cleared when the SCSR is read (with FE equal to 1) followed by a read
of the SCDR.
M68HC11E Family — Rev. 5
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Data Sheet
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Serial Communications Interface (SCI)
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Serial Communications Interface (SCI)
7.7 SCI Registers
Five addressable registers are associated with the SCI:
•
Four control and status registers:
–
–
–
–
Serial communications control register 1 (SCCR1)
Serial communications control register 2 (SCCR2)
Baud rate register (BAUD)
Serial communications status register (SCSR)
•
One data register:
Serial communications data register (SCDR)
–
The SCI registers are the same for all M68HC11 E-series devices with one
exception. The SCI system for MC68HC(7)11E20 contains an extra bit in the
BAUD register that provides a greater selection of baud prescaler rates. Refer to
7.7.5 Baud Rate Register, Figure 7-8, and Figure 7-9.
7.7.1 Serial Communications Data Register
SCDR is a parallel register that performs two functions:
•
•
The receive data register when it is read
The transmit data register when it is written
Reads access the receive data buffer and writes access the transmit data buffer.
Receive and transmit are double buffered.
Address:
$102F
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
R7/T7
R6/T6
R5/T5
R4/T4
R3/T3
R2/T2
R1/T1
R0/T0
Indeterminate after reset
Figure 7-3. Serial Communications Data Register (SCDR)
Data Sheet
122
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Serial Communications Interface (SCI)
SCI Registers
7.7.2 Serial Communications Control Register 1
The SCCR1 register provides the control bits that determine word length and select
the method used for the wakeup feature.
Address:
$102C
Bit 7
6
T8
I
5
0
4
M
0
3
WAKE
0
2
0
1
0
Bit 0
Read:
Write:
Reset:
R8
I
0
I = Indeterminate after reset
= Unimplemented
Figure 7-4. Serial Communications Control Register 1 (SCCR1)
R8 — Receive Data Bit 8
If M bit is set, R8 stores the ninth bit in the receive data character.
T8 — Transmit Data Bit 8
If M bit is set, T8 stores the ninth bit in the transmit data character.
Bit 5 — Unimplemented
Always reads 0
M — Mode Bit (select character format)
0 = Start bit, 8 data bits, 1 stop bit
1 = Start bit, 9 data bits, 1 stop bit
WAKE — Wakeup by Address Mark/Idle Bit
0 = Wakeup by IDLE line recognition
1 = Wakeup by address mark (most significant data bit set)
Bits [2:0] — Unimplemented
Always read 0
M68HC11E Family — Rev. 5
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Data Sheet
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Serial Communications Interface (SCI)
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Serial Communications Interface (SCI)
7.7.3 Serial Communications Control Register 2
The SCCR2 register provides the control bits that enable or disable individual SCI
functions.
Address:
$102D
Bit 7
6
TCIE
0
5
RIE
0
4
ILIE
0
3
TE
0
2
RE
0
1
RWU
0
Bit 0
SBK
0
Read:
Write:
Reset:
TIE
0
Figure 7-5. Serial Communications Control Register 2 (SCCR2)
TIE — Transmit Interrupt Enable Bit
0 = TDRE interrupts disabled
1 = SCI interrupt requested when TDRE status flag is set
TCIE — Transmit Complete Interrupt Enable Bit
0 = TC interrupts disabled
1 = SCI interrupt requested when TC status flag is set
RIE — Receiver Interrupt Enable Bit
0 = RDRF and OR interrupts disabled
1 = SCI interrupt requested when RDRF flag or the OR status flag is set
ILIE — Idle-Line Interrupt Enable Bit
0 = IDLE interrupts disabled
1 = SCI interrupt requested when IDLE status flag is set
TE — Transmitter Enable Bit
When TE goes from 0 to 1, one unit of idle character time (logic 1) is queued as
a preamble.
0 = Transmitter disabled
1 = Transmitter enabled
RE — Receiver Enable Bit
0 = Receiver disabled
1 = Receiver enabled
RWU — Receiver Wakeup Control Bit
0 = Normal SCI receiver
1 = Wakeup enabled and receiver interrupts inhibited
SBK — Send Break
At least one character time of break is queued and sent each time SBK is written
to 1. As long as the SBK bit is set, break characters are queued and sent. More
than one break may be sent if the transmitter is idle at the time the SBK bit is
toggled on and off, as the baud rate clock edge could occur between writing
the 1 and writing the 0 to SBK.
0 = Break generator off
1 = Break codes generated
Data Sheet
124
M68HC11E Family — Rev. 5
Serial Communications Interface (SCI)
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Serial Communications Interface (SCI)
SCI Registers
7.7.4 Serial Communication Status Register
The SCSR provides inputs to the interrupt logic circuits for generation of the SCI
system interrupt.
Address:
$102E
Bit 7
6
TC
1
5
RDRF
0
4
IDLE
0
3
OR
0
2
NF
0
1
FE
0
Bit 0
Read:
Write:
Reset:
TDRE
1
0
= Unimplemented
Figure 7-6. Serial Communications Status Register (SCSR)
TDRE — Transmit Data Register Empty Flag
This flag is set when SCDR is empty. Clear the TDRE flag by reading SCSR with
TDRE set and then writing to SCDR.
0 = SCDR busy
0 = SCDR empty
TC — Transmit Complete Flag
This flag is set when the transmitter is idle (no data, preamble, or break
transmission in progress). Clear the TC flag by reading SCSR with TC set and
then writing to SCDR.
0 = Transmitter busy
1 = Transmitter idle
RDRF — Receive Data Register Full Flag
This flag is set if a received character is ready to be read from SCDR. Clear the
RDRF flag by reading SCSR with RDRF set and then reading SCDR.
0 = SCDR empty
1 = SCDR full
IDLE — Idle Line Detected Flag
This flag is set if the RxD line is idle. Once cleared, IDLE is not set again until
the RxD line has been active and becomes idle again. The IDLE flag is inhibited
when RWU = 1. Clear IDLE by reading SCSR with IDLE set and then reading
SCDR.
0 = RxD line active
1 = RxD line idle
OR — Overrun Error Flag
OR is set if a new character is received before a previously received character
is read from SCDR. Clear the OR flag by reading SCSR with OR set and then
reading SCDR.
0 = No overrun
1 = Overrun detected
M68HC11E Family — Rev. 5
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Serial Communications Interface (SCI)
NF — Noise Error Flag
NF is set if majority sample logic detects anything other than a unanimous
decision. Clear NF by reading SCSR with NF set and then reading SCDR.
0 = Unanimous decision
1 = Noise detected
FE — Framing Error Flag
FE is set when a 0 is detected where a stop bit was expected. Clear the FE flag
by reading SCSR with FE set and then reading SCDR.
0 = Stop bit detected
1 = Zero detected
Bit 0 — Unimplemented
Always reads 0
7.7.5 Baud Rate Register
Use this register to select different baud rates for the SCI system. The SCP[1:0]
(SCP[2:0] in MC68HC(7)11E20) bits function as a prescaler for the SCR[2:0] bits.
Together, these five bits provide multiple baud rate combinations for a given crystal
frequency. Normally, this register is written once during initialization. The prescaler
is set to its fastest rate by default out of reset and can be changed at any time.
Refer to Table 7-1 for normal baud rate selections.
Address:
$102B
Bit 7
6
SCP2
0
5
SCP1
0
4
SCP0
0
3
RCKB
0
2
SCR2
U
1
SCR1
U
Bit 0
SCR0
U
Read:
Write:
Reset:
TCLR
0
U = Unaffected
Figure 7-7. Baud Rate Register (BAUD)
TCLR — Clear Baud Rate Counter Bit (Test)
SCP[2:0] — SCI Baud Rate Prescaler Select Bits
NOTE:
SCP2 applies to MC68HC(7)11E20 only. When SCP2 = 1, SCP[1:0] must equal 0s.
Any other values for SCP[1:0] are not decoded in the prescaler and the results are
unpredictable. Refer to Figure 7-8 and Figure 7-9.
RCKB — SCI Baud Rate Clock Check Bit (Test)
Data Sheet
126
M68HC11E Family — Rev. 5
Serial Communications Interface (SCI)
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Serial Communications Interface (SCI)
SCI Registers
Table 7-1. Baud Rate Values
Crystal Frequency (MHz)
Baud
4.00 4.9152
Prescale
8.00
Bus Frequency (MHz)
2.00 2.50 3.00
10.00
12.00
16.00
4.00
Set
Divide
Prescaler Selects
Divide
SCP2 SCP1 SCP0 SCR2 SCR1 SCR0
1.00
1.23
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
1
2
4
62500 76800 125000 156250 187500 250000
31250 38400 62500
15625 19200 31250
78125
39063
19531
9766
93750
46875
23438
11719
5859
125000
62500
31250
15625
7813
8
7813
3906
1953
977
9600
4800
2400
1200
600
15625
7813
3906
1953
977
16
32
64
128
4883
2441
2930
3906
488
1221
1465
1953
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
3
3
3
3
3
3
3
3
1
2
4
20833 25600 41667
10417 12800 20833
52083
26042
13021
6510
3255
1628
814
62500
31250
15625
7813
3906
1953
977
83333
41667
20833
10417
5208
2604
1302
651
5208
2604
1302
651
6400
3200
1600
800
10417
5208
2604
1302
651
8
16
32
64
128
326
400
163
200
326
407
488
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
4
4
4
4
4
4
4
4
1
2
4
15625 19200 31250
39063
19531
9766
4883
2441
1221
610
46875
23438
11719
5859
2930
1465
732
62500
31250
15625
7813
3906
1953
977
7813
3906
1953
977
9600
4800
2400
1200
600
15625
7813
3906
1953
977
8
16
32
64
128
488
244
300
488
122
150
244
305
366
488
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
13
13
13
13
13
13
13
13
1
2
4
4808
2404
1202
601
300
150
75
5908
2954
1477
738
369
185
92
9615
4808
2404
1202
601
300
150
75
12019
6010
3005
1502
751
376
188
94
14423
7212
3606
1803
901
451
225
113
19231
9615
4808
2404
1202
601
8
16
32
64
128
300
150
38
46
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
39
39
39
39
39
39
39
39
1
2
4
1603
801
401
200
100
50
1969
985
492
246
123
62
3205
1603
801
401
200
100
50
4006
2003
1002
501
250
125
63
4808
2404
1202
601
300
150
75
6410
3205
1603
801
401
200
100
50
8
16
32
64
128
25
13
31
15
25
31
38
Shaded areas reflect standard baud rates.
On MC68HC(7)11E20 do not set SCP1 or SCP0 when SCP2 is 1.
M68HC11E Family — Rev. 5
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Data Sheet
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Serial Communications Interface (SCI)
SCR[2:0] — SCI Baud Rate Select Bits
Selects receiver and transmitter bit rate based on output from baud rate
prescaler stage. Refer to Figure 7-8 and Figure 7-9.
The prescaler bits, SCP[2:0], determine the highest baud rate, and the SCR[2:0]
bits select an additional binary submultiple (÷1, ÷2, ÷4, through ÷128) of this
highest baud rate. The result of these two dividers in series is the 16X receiver
baud rate clock. The SCR[2:0] bits are not affected by reset and can be changed
at any time, although they should not be changed when any SCI transfer is in
progress.
Figure 7-8 and Figure 7-9 illustrate the SCI baud rate timing chain. The
prescaler select bits determine the highest baud rate. The rate select bits
determine additional divide by two stages to arrive at the receiver timing (RT)
clock rate. The baud rate clock is the result of dividing the RT clock by 16.
EXTAL
OSCILLATOR
INTERNAL BUS CLOCK (PH2)
AND
CLOCK GENERATOR
(÷4)
XTAL
÷ 3
÷ 4
÷ 13
SCP[1:0]
1:1
E
0:0
0:1
1:0
AS
SCR[2:0]
0:0:0
0:0:1
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
÷ 16
SCI
TRANSMIT
BAUD RATE
(1X)
SCI
RECEIVE
BAUD RATE
(16X)
Figure 7-8. SCI Baud Rate Generator Block Diagram
Data Sheet
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Serial Communications Interface (SCI)
Status Flags and Interrupts
EXTAL
XTAL
OSCILLATOR
AND
CLOCK GENERATOR
(÷4)
INTERNAL BUS CLOCK (PH2)
÷ 3
÷ 4
÷ 13
÷ 39
SCP[2:0]*
1:0:0
E
0:0:0
0:0:1
0:1:0
0:1:1
AS
SCR[2:0]
0:0:0
0:0:1
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
÷ 16
SCI
TRANSMIT
BAUD RATE
(1X)
SCI
RECEIVE
BAUD RATE
(16X)
*SCP2 is present only on MC68HC(7)11E20.
Figure 7-9. MC68HC(7)11E20 SCI Baud Rate
Generator Block Diagram
7.8 Status Flags and Interrupts
The SCI transmitter has two status flags. These status flags can be read by
software (polled) to tell when the corresponding condition exists. Alternatively, a
local interrupt enable bit can be set to enable each of these status conditions to
generate interrupt requests when the corresponding condition is present. Status
flags are automatically set by hardware logic conditions, but must be cleared by
software, which provides an interlock mechanism that enables logic to know when
software has noticed the status indication. The software clearing sequence for
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Serial Communications Interface (SCI)
these flags is automatic. Functions that are normally performed in response to the
status flags also satisfy the conditions of the clearing sequence.
TDRE and TC flags are normally set when the transmitter is first enabled (TE set
to 1). The TDRE flag indicates there is room in the transmit queue to store another
data character in the TDR. The TIE bit is the local interrupt mask for TDRE. When
TIE is 0, TDRE must be polled. When TIE and TDRE are 1, an interrupt is
requested.
The TC flag indicates the transmitter has completed the queue. The TCIE bit is the
local interrupt mask for TC. When TCIE is 0, TC must be polled. When TCIE is 1
and TC is 1, an interrupt is requested.
Writing a 0 to TE requests that the transmitter stop when it can. The transmitter
completes any transmission in progress before actually shutting down. Only an
MCU reset can cause the transmitter to stop and shut down immediately. If TE is
written to 0 when the transmitter is already idle, the pin reverts to its
general-purpose I/O function (synchronized to the bit-rate clock). If anything is
being transmitted when TE is written to 0, that character is completed before the
pin reverts to general-purpose I/O, but any other characters waiting in the transmit
queue are lost. The TC and TDRE flags are set at the completion of this last
character, even though TE has been disabled.
7.9 Receiver Flags
The SCI receiver has five status flags, three of which can generate interrupt
requests. The status flags are set by the SCI logic in response to specific conditions
in the receiver. These flags can be read (polled) at any time by software. Refer to
Figure 7-10, which shows SCI interrupt arbitration.
When an overrun takes place, the new character is lost, and the character that was
in its way in the parallel RDR is undisturbed. RDRF is set when a character has
been received and transferred into the parallel RDR. The OR flag is set instead of
RDRF if overrun occurs. A new character is ready to be transferred into RDR
before a previous character is read from RDR.
The NF and FE flags provide additional information about the character in the RDR,
but do not generate interrupt requests.
The last receiver status flag and interrupt source come from the IDLE flag. The RxD
line is idle if it has constantly been at logic 1 for a full character time. The IDLE flag
is set only after the RxD line has been busy and becomes idle, which prevents
repeated interrupts for the whole time RxD remains idle.
Data Sheet
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Serial Communications Interface (SCI)
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Serial Communications Interface (SCI)
Receiver Flags
BEGIN
Y
Y
FLAG
RDRF = 1?
N
Y
Y
Y
Y
Y
OR = 1?
N
RIE = 1?
N
RE = 1?
N
Y
Y
Y
Y
TDRE = 1?
N
TE = 1?
N
TIE = 1?
N
TC = 1?
N
TCIE = 1?
N
Y
IDLE = 1?
RE = 1?
N
ILIE = 1?
N
N
NO
VALID SCI REQUEST
VALID SCI REQUEST
Figure 7-10. Interrupt Source Resolution Within SCI
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Data Sheet
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Data Sheet — M68HC11E Family
Section 8. Serial Peripheral Interface (SPI)
8.1 Introduction
The serial peripheral interface (SPI), an independent serial communications
subsystem, allows the MCU to communicate synchronously with peripheral
devices, such as:
•
•
•
•
Frequency synthesizers
Liquid crystal display (LCD) drivers
Analog-to-digital (A/D) converter subsystems
Other microprocessors
The SPI is also capable of inter-processor communication in a multiple master
system. The SPI system can be configured as either a master or a slave device.
When configured as a master, data transfer rates can be as high as one-half the
E-clock rate (1.5 Mbits per second for a 3-MHz bus frequency). When configured
as a slave, data transfers can be as fast as the E-clock rate (3 Mbits per second for
a 3-MHz bus frequency).
8.2 Functional Description
The central element in the SPI system is the block containing the shift register and
the read data buffer. The system is single buffered in the transmit direction and
double buffered in the receive direction. This means that new data for transmission
cannot be written to the shifter until the previous transfer is complete; however,
received data is transferred into a parallel read data buffer so the shifter is free to
accept a second serial character. As long as the first character is read out of the
read data buffer before the next serial character is ready to be transferred, no
overrun condition occurs. A single MCU register address is used for reading data
from the read data buffer and for writing data to the shifter.
The SPI status block represents the SPI status functions (transfer complete, write
collision, and mode fault) performed by the serial peripheral status register (SPSR).
The SPI control block represents those functions that control the SPI system
through the serial peripheral control register (SPCR).
Refer to Figure 8-1, which shows the SPI block diagram.
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Serial Peripheral Interface (SPI)
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Serial Peripheral Interface (SPI)
S
MISO
PD2
INTERNAL
MCU CLOCK
M
MSB
LSB
M
S
MOSI
PD3
8--BIT SHIFT REGISTER
DIVIDER
READ DATA BUFFER
÷2 ÷4 ÷16 ÷32
CLOCK
CLOCK
LOGIC
SELECT
S
SCK
PD4
M
SS
PD5
MSTR
SPE
SPI CONTROL
SPI STATUS REGISTER
SPI CONTROL REGISTER
SPI INTERRUPT
REQUEST
INTERNAL
DATA BUS
Figure 8-1. SPI Block Diagram
8.3 SPI Transfer Formats
During an SPI transfer, data is simultaneously transmitted and received. A serial
clock line synchronizes shifting and sampling of the information on the two serial
data lines. A slave select line allows individual selection of a slave SPI device;
slave devices that are not selected do not interfere with SPI bus activities. On a
master SPI device, the select line can optionally be used to indicate a multiple
master bus contention. Refer to Figure 8-2.
Data Sheet
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Serial Peripheral Interface (SPI)
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Serial Peripheral Interface (SPI)
Clock Phase and Polarity Controls
SCK CYCLE #
1
2
3
4
5
6
7
8
SCK (CPOL = 0)
SCK (CPOL = 1)
SAMPLE INPUT
MSB
6
5
4
3
2
1
LSB
(CPHA = 0)
DATA OUT
SAMPLE INPUT
(CPHA = 1) DATA OUT
SS (TO SLAVE)
MSB
6
5
4
3
2
1
LSB
SLAVE CPHA = 1 TRANSFER IN PROGRESS
MASTER TRANSFER IN PROGRESS
3
2
4
SLAVE CPHA = 0 TRANSFER IN PROGRESS
1
5
1. SS ASSERTED
2. MASTER WRITES TO SPDR
3. FIRST SCK EDGE
4. SPIF SET
5. SS NEGATED
Figure 8-2. SPI Transfer Format
8.4 Clock Phase and Polarity Controls
Software can select one of four combinations of serial clock phase and polarity
using two bits in the SPI control register (SPCR). The clock polarity is specified by
the CPOL control bit, which selects an active high or active low clock, and has no
significant effect on the transfer format. The clock phase (CPHA) control bit selects
one of two different transfer formats. The clock phase and polarity should be
identical for the master SPI device and the communicating slave device. In some
cases, the phase and polarity are changed between transfers to allow a master
device to communicate with peripheral slaves having different requirements.
When CPHA equals 0, the SS line must be negated and reasserted between each
successive serial byte. Also, if the slave writes data to the SPI data register (SPDR)
while SS is low, a write collision error results.
When CPHA equals 1, the SS line can remain low between successive transfers.
8.5 SPI Signals
This subsection contains descriptions of the four SPI signals:
•
•
•
•
Master in/slave out (MISO)
Master out/slave in (MOSI)
Serial clock (SCK)
Slave select (SS)
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Data Sheet
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Serial Peripheral Interface (SPI)
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Serial Peripheral Interface (SPI)
Any SPI output line must have its corresponding data direction bit in DDRD register
set. If the DDR bit is clear, that line is disconnected from the SPI logic and becomes
a general-purpose input. All SPI input lines are forced to act as inputs regardless
of the state of the corresponding DDR bits in DDRD register.
8.5.1 Master In/Slave Out
MISO is one of two unidirectional serial data signals. It is an input to a master
device and an output from a slave device. The MISO line of a slave device is placed
in the high-impedance state if the slave device is not selected.
8.5.2 Master Out/Slave In
The MOSI line is the second of the two unidirectional serial data signals. It is an
output from a master device and an input to a slave device. The master device
places data on the MOSI line a half-cycle before the clock edge that the slave
device uses to latch the data.
8.5.3 Serial Clock
SCK, an input to a slave device, is generated by the master device and
synchronizes data movement in and out of the device through the MOSI and MISO
lines. Master and slave devices are capable of exchanging a byte of information
during a sequence of eight clock cycles.
Four possible timing relationships can be chosen by using control bits CPOL and
CPHA in the serial peripheral control register (SPCR). Both master and slave
devices must operate with the same timing. The SPI clock rate select bits,
SPR[1:0], in the SPCR of the master device, select the clock rate. In a slave device,
SPR[1:0] have no effect on the operation of the SPI.
8.5.4 Slave Select
The slave select (SS) input of a slave device must be externally asserted before a
master device can exchange data with the slave device. SS must be low before
data transactions and must stay low for the duration of the transaction.
The SS line of the master must be held high. If it goes low, a mode fault error flag
(MODF) is set in the serial peripheral status register (SPSR). To disable the mode
fault circuit, write a 1 in bit 5 of the port D data direction register. This sets the SS
pin to act as a general-purpose output rather than the dedicated input to the slave
select circuit, thus inhibiting the mode fault flag. The other three lines are dedicated
to the SPI whenever the serial peripheral interface is on.
The state of the master and slave CPHA bits affects the operation of SS. CPHA
settings should be identical for master and slave. When CPHA = 0, the shift clock
is the OR of SS with SCK. In this clock phase mode, SS must go high between
successive characters in an SPI message. When CPHA = 1, SS can be left low
Data Sheet
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M68HC11E Family — Rev. 5
Serial Peripheral Interface (SPI)
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Serial Peripheral Interface (SPI)
SPI System Errors
between successive SPI characters. In cases where there is only one SPI slave
MCU, its SS line can be tied to VSS as long as only CPHA = 1 clock mode is used.
8.6 SPI System Errors
Two system errors can be detected by the SPI system. The first type of error arises
in a multiple-master system when more than one SPI device simultaneously tries
to be a master. This error is called a mode fault. The second type of error, write
collision, indicates that an attempt was made to write data to the SPDR while a
transfer was in progress.
When the SPI system is configured as a master and the SS input line goes to active
low, a mode fault error has occurred — usually because two devices have
attempted to act as master at the same time. In cases where more than one device
is concurrently configured as a master, there is a chance of contention between
two pin drivers. For push-pull CMOS drivers, this contention can cause permanent
damage. The mode fault mechanism attempts to protect the device by disabling the
drivers. The MSTR control bit in the SPCR and all four DDRD control bits
associated with the SPI are cleared and an interrupt is generated subject to
masking by the SPIE control bit and the I bit in the CCR.
Other precautions may need to be taken to prevent driver damage. If two devices
are made masters at the same time, mode fault does not help protect either one
unless one of them selects the other as slave. The amount of damage possible
depends on the length of time both devices attempt to act as master.
A write collision error occurs if the SPDR is written while a transfer is in progress.
Because the SPDR is not double buffered in the transmit direction, writes to SPDR
cause data to be written directly into the SPI shift register. Because this write
corrupts any transfer in progress, a write collision error is generated. The transfer
continues undisturbed, and the write data that caused the error is not written to the
shifter.
A write collision is normally a slave error because a slave has no control over when
a master initiates a transfer. A master knows when a transfer is in progress, so
there is no reason for a master to generate a write-collision error, although the SPI
logic can detect write collisions in both master and slave devices.
The SPI configuration determines the characteristics of a transfer in progress. For
a master, a transfer begins when data is written to SPDR and ends when SPIF is
set. For a slave with CPHA equal to 0, a transfer starts when SS goes low and ends
when SS returns high. In this case, SPIF is set at the middle of the eighth SCK
cycle when data is transferred from the shifter to the parallel data register, but the
transfer is still in progress until SS goes high. For a slave with CPHA equal to 1,
transfer begins when the SCK line goes to its active level, which is the edge at the
beginning of the first SCK cycle. The transfer ends in a slave in which CPHA
equals 1 when SPIF is set.
M68HC11E Family — Rev. 5
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Serial Peripheral Interface (SPI)
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Serial Peripheral Interface (SPI)
8.7 SPI Registers
The three SPI registers are:
•
•
•
Serial peripheral control register (SPCR)
Serial peripheral status register (SPSR)
Serial peripheral data register (SPDR)
These registers provide control, status, and data storage functions.
8.7.1 Serial Peripheral Control Register
Address:
$1028
Bit 7
6
SPE
0
5
DWOM
0
4
MSTR
0
3
CPOL
0
2
CPHA
1
1
SPR1
U
Bit 0
SPR0
U
Read:
Write:
Reset:
SPIE
0
U = Unaffected
Figure 8-3. Serial Peripheral Control Register (SPCR)
SPIE — Serial Peripheral Interrupt Enable Bit
Set the SPE bit to 1 to request a hardware interrupt sequence each time the
SPIF or MODF status flag is set. SPI interrupts are inhibited if this bit is clear or
if the I bit in the condition code register is 1.
0 = SPI system interrupts disabled
1 = SPI system interrupts enabled
SPE — Serial Peripheral System Enable Bit
When the SPE bit is set, the port D bit 2, 3, 4, and 5 pins are dedicated to the
SPI function. If the SPI is in the master mode and DDRD bit 5 is set, then the
port D bit 5 pin becomes a general-purpose output instead of the SS input.
0 = SPI system disabled
1 = SPI system enabled
DWOM — Port D Wired-OR Mode Bit
DWOM affects all port D pins.
0 = Normal CMOS outputs
1 = Open-drain outputs
MSTR — Master Mode Select Bit
It is customary to have an external pullup resistor on lines that are driven by
open-drain devices.
0 = Slave mode
1 = Master mode
Data Sheet
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Serial Peripheral Interface (SPI)
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Serial Peripheral Interface (SPI)
SPI Registers
CPOL — Clock Polarity Bit
When the clock polarity bit is cleared and data is not being transferred, the SCK
pin of the master device has a steady state low value. When CPOL is set, SCK
idles high. Refer to Figure 8-2 and 8.4 Clock Phase and Polarity Controls.
CPHA — Clock Phase Bit
The clock phase bit, in conjunction with the CPOL bit, controls the clock-data
relationship between master and slave. The CPHA bit selects one of two
different clocking protocols. Refer to Figure 8-2 and 8.4 Clock Phase and
Polarity Controls.
SPR[1:0] — SPI Clock Rate Select Bits
These two bits select the SPI clock (SCK) rate when the device is configured as
master. When the device is configured as slave, these bits have no effect. Refer
to Table 8-1.
Table 8-1. SPI Clock Rates
Frequency at
E = 1 MHz
(Baud)
Frequency at
E = 2 MHz
(Baud)
Frequency at
E = 3 MHz (
Baud)
Frequency at
E = 4 MHz
(Baud)
Divide
E Clock By
SPR[1:0]
0 0
0 1
1 0
1 1
2
4
500 kHz
250 kHz
62.5 kHz
31.3 kHz
1.0 MHz
500 kHz
125 kHz
62.5 kHz
1.5 MHz
750 kHz
2 MHz
1 MHz
16
32
187.5 kHz
93.8 kHz
250 kHz
125 kHz
8.7.2 Serial Peripheral Status Register
Address:
$1029
Bit 7
6
5
4
MODF
0
3
0
2
0
1
0
Bit 0
Read:
Write:
Reset:
SPIF
0
WCOL
0
0
0
= Unimplemented
Figure 8-4. Serial Peripheral Status Register (SPSR)
SPIF — SPI Interrupt Complete Flag
SPIF is set upon completion of data transfer between the processor and the
external device. If SPIF goes high, and if SPIE is set, a serial peripheral interrupt
is generated. To clear the SPIF bit, read the SPSR with SPIF set, then access
the SPDR. Unless SPSR is read (with SPIF set) first, attempts to write SPDR
are inhibited.
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Data Sheet
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Serial Peripheral Interface (SPI)
WCOL — Write Collision Bit
Clearing the WCOL bit is accomplished by reading the SPSR (with WCOL set)
followed by an access of SPDR. Refer to 8.5.4 Slave Select and 8.6 SPI
System Errors.
0 = No write collision
1 = Write collision
Bit 5 — Unimplemented
Always reads 0
MODF — Mode Fault Bit
To clear the MODF bit, read the SPSR (with MODF set), then write to the SPCR.
Refer to 8.5.4 Slave Select and 8.6 SPI System Errors.
0 = No mode fault
1 = Mode fault
Bits [3:0] — Unimplemented
Always read 0
8.7.3 Serial Peripheral Data I/O Register
The SPDR is used when transmitting or receiving data on the serial bus. Only a
write to this register initiates transmission or reception of a byte, and this only
occurs in the master device. At the completion of transferring a byte of data, the
SPIF status bit is set in both the master and slave devices.
A read of the SPDR is actually a read of a buffer. To prevent an overrun and the
loss of the byte that caused the overrun, the first SPIF must be cleared by the time
a second transfer of data from the shift register to the read buffer is initiated.
Address:
$102A
Bit 7
6
5
4
3
2
1
Bit 0
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Indeterminate after reset
Figure 8-5. Serial Peripheral Data I/O Register (SPDR)
SPI is double buffered in and single buffered out.
Data Sheet
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Data Sheet — M68HC11E Family
Section 9. Timing System
9.1 Introduction
The M68HC11 timing system is composed of five clock divider chains. The main
clock divider chain includes a 16-bit free-running counter, which is driven by a
programmable prescaler. The main timer’s programmable prescaler provides one
of the four clocking rates to drive the 16-bit counter. Two prescaler control bits
select the prescale rate.
The prescaler output divides the system clock by 1, 4, 8, or 16. Taps off of this main
clocking chain drive circuitry that generates the slower clocks used by the pulse
accumulator, the real-time interrupt (RTI), and the computer operating properly
(COP) watchdog subsystems, also described in this section. Refer to Figure 9-1.
All main timer system activities are referenced to this free-running counter. The
counter begins incrementing from $0000 as the MCU comes out of reset and
continues to the maximum count, $FFFF. At the maximum count, the counter rolls
over to $0000, sets an overflow flag, and continues to increment. As long as the
MCU is running in a normal operating mode, there is no way to reset, change, or
interrupt the counting. The capture/compare subsystem features three input
capture channels, four output compare channels, and one channel that can be
selected to perform either input capture or output compare. Each of the three input
capture functions has its own 16-bit input capture register (time capture latch) and
each of the output compare functions has its own 16-bit compare register. All timer
functions, including the timer overflow and RTI, have their own interrupt controls
and separate interrupt vectors.
The pulse accumulator contains an 8-bit counter and edge select logic. The pulse
accumulator can operate in either event counting mode or gated time accumulation
mode. During event counting mode, the pulse accumulator’s 8-bit counter
increments when a specified edge is detected on an input signal. During gated time
accumulation mode, an internal clock source increments the 8-bit counter while an
input signal has a predetermined logic level.
The real-time interrupt (RTI) is a programmable periodic interrupt circuit that
permits pacing the execution of software routines by selecting one of four interrupt
rates.
M68HC11E Family — Rev. 5
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Data Sheet
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Timing System
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Timing System
OSCILLATOR AND
CLOCK GENERATOR
(DIVIDE BY FOUR)
AS
E CLOCK
INTERNAL BUS CLOCK (PH2)
SPI
PRESCALER
(÷ 2, 4, 16, 32)
SPR[1:0]
PRESCALER
(÷ 1, 2, 4,....128)
SCR[2:0]
PRESCALER
(÷ 1, 3, 4, 13)
SCP[1:0]
÷39
SCI RECEIVER CLOCK
SCI TRANSMIT CLOCK
PULSE ACCUMULATOR
SCP2*
÷16
E ÷ 26
PRESCALER
(÷÷ 1, 2, 4, 8)
RTR[1:0]
E ÷ 213
REAL-TIME INTERRUPT
÷ 4
E÷215
PRESCALER
(÷ 1, 4, 8, 16)
PR[1:0]
PRESCALER
(÷1, 4, 16, 64)
CR[1:0]
TOF
TCNT
FF1
FF2
S
R
Q
Q
S
R
Q
Q
FORCE
COP
RESET
IC/OC
CLEAR COP
TIMER
SYSTEM
RESET
E SERIES TIM DIV CHAIN
* SCP2 present on MC68HC(7)11E20 only
Figure 9-1. Timer Clock Divider Chains
Data Sheet
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Timing System
Timer Structure
The COP watchdog clock input (E ÷ 215) is tapped off of the free-running counter
chain. The COP automatically times out unless it is serviced within a specific time
by a program reset sequence. If the COP is allowed to time out, a reset is
generated, which drives the RESET pin low to reset the MCU and the external
system. Refer to Table 9-1 for crystal-related frequencies and periods.
Table 9-1. Timer Summary
XTAL Frequencies
4.0 MHz
1.0 MHz
1000 ns
8.0 MHz
2.0 MHz
500 ns
12.0 MHz
3.0 MHz
333 ns
Other Rates
(E)
Control Bits
PR1, PR0
(1/E)
Main Timer Count Rates
0 0
1 count —
overflow —
(E/1)
(E/216
1000 ns
65.536 ms
500 ns
32.768 ms
333 ns
21.845 ms
)
)
)
0 1
1 count —
overflow —
(E/4)
(E/218
4.0 µs
262.14 ms
2.0 µs
131.07 ms
1.333 µs
87.381 ms
1 0
1 count —
overflow —
(E/8)
(E/219
8.0 µs
524.29 ms
4.0 µs
262.14 ms
2.667 µs
174.76 ms
1 1
1 count —
overflow —
(E/16)
(E/220
16.0 µs
1.049 s
8.0 µs
524.29 ms
5.333 µs
349.52 ms
)
9.2 Timer Structure
Figure 9-2 shows the capture/compare system block diagram. The port A pin
control block includes logic for timer functions and for general-purpose I/O. For pins
PA3, PA2, PA1, and PA0, this block contains both the edge-detection logic and the
control logic that enables the selection of which edge triggers an input capture. The
digital level on PA[3:0] can be read at any time (read PORTA register), even if the
pin is being used for the input capture function. Pins PA[6:3] are used for either
general-purpose I/O, or as output compare pins. When one of these pins is being
used for an output compare function, it cannot be written directly as if it were a
general-purpose output. Each of the output compare functions (OC[5:2]) is related
to one of the port A output pins. Output compare one (OC1) has extra control logic,
allowing it optional control of any combination of the PA[7:3] pins. The PA7 pin can
be used as a general-purpose I/O pin, as an input to the pulse accumulator, or as
an OC1 output pin.
M68HC11E Family — Rev. 5
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Timing System
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Timing System
PRESCALER
DIVIDE BY
TCNT (HI)
TCNT (LO)
TOI
9
1, 4, 8, OR 16
MCU
16-BIT FREE-RUNNING
COUNTER
TOF
PR1
PR0
E CLK
TAPS FOR RTI,
COP WATCHDOG, AND
PULSE ACCUMULATOR
INTERRUPT REQUESTS
(FURTHER QUALIFIED BY
I BIT IN CCR)
16-BIT TIMER BUS
TO PULSE
ACCUMULATOR
OC1I
PIN
FUNCTIONS
8
16-BIT COMPARATOR =
OC1F
OC2F
OC3F
PA7/OC1/
PAI
TOC1 (HI) TOC1 (LO)
BIT 7
BIT 6
FOC1
FOC2
FOC3
FOC4
FOC5
OC2I
OC3I
OC4I
I4/O5I
7
6
5
4
16-BIT COMPARATOR =
PA6/OC2/
OC1
TOC2 (HI) TOC2 (LO)
16-BIT COMPARATOR =
PA5/OC3/
OC1
BIT 5
BIT 4
BIT 3
TOC3 (HI) TOC3 (LO)
16-BIT COMPARATOR =
OC4F
OC5
PA4/OC4/
OC1
TOC4 (HI) TOC4 (LO)
16-BIT COMPARATOR =
TI4/O5 (HI) TI4/O5 (LO)
16-BIT LATCH CLK
PA3/OC5/
IC4/OC1
I4/O5F
IC4
CFORC
FORCE OUTPUT
COMPARE
I4/O5
IC1I
IC2I
IC3I
3
2
1
CLK
TIC1 (LO)
BIT 2
BIT 1
BIT 0
16-BIT LATCH
IC1F
PA2/IC1
PA1/IC2
PA0/IC3
TIC1 (HI)
CLK
16-BIT LATCH
IC2F
IC3F
TIC2 (HI)
TIC2 (LO)
CLK
16-BIT LATCH
TIC3 (HI)
TIC3 (LO)
TFLG 1
STATUS
FLAGS
TMSK 1
INTERRUPT
ENABLES
PORT A
PIN CONTROL
Figure 9-2. Capture/Compare Block Diagram
Data Sheet
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Timing System
Input Capture
9.3 Input Capture
The input capture function records the time an external event occurs by latching
the value of the free-running counter when a selected edge is detected at the
associated timer input pin. Software can store latched values and use them to
compute the periodicity and duration of events. For example, by storing the times
of successive edges of an incoming signal, software can determine the period and
pulse width of a signal. To measure period, two successive edges of the same
polarity are captured. To measure pulse width, two alternate polarity edges are
captured.
In most cases, input capture edges are asynchronous to the internal timer counter,
which is clocked relative to an internal clock (PH2). These asynchronous capture
requests are synchronized to PH2 so that the latching occurs on the opposite half
cycle of PH2 from when the timer counter is being incremented. This
synchronization process introduces a delay from when the edge occurs to when
the counter value is detected. Because these delays offset each other when the
time between two edges is being measured, the delay can be ignored. When an
input capture is being used with an output compare, there is a similar delay
between the actual compare point and when the output pin changes state.
The control and status bits that implement the input capture functions are
contained in:
•
•
•
•
Pulse accumulator control register (PACTL)
Timer control 2 register (TCTL2)
Timer interrupt mask 1 register (TMSK1)
Timer interrupt flag 2 register (TFLG1)
To configure port A bit 3 as an input capture, clear the DDRA3 bit of the PACTL
register. Note that this bit is cleared out of reset. To enable PA3 as the fourth input
capture, set the I4/O5 bit in the PACTL register. Otherwise, PA3 is configured as a
fifth output compare out of reset, with bit I4/O5 being cleared. If the DDRA3 bit is
set (configuring PA3 as an output), and IC4 is enabled, then writes to PA3 cause
edges on the pin to result in input captures. Writing to TI4/O5 has no effect when
the TI4/O5 register is acting as IC4.
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Timing System
9.3.1 Timer Control Register 2
Use the control bits of this register to program input capture functions to detect a
particular edge polarity on the corresponding timer input pin. Each of the input
capture functions can be independently configured to detect rising edges only,
falling edges only, any edge (rising or falling), or to disable the input capture
function. The input capture functions operate independently of each other and can
capture the same TCNT value if the input edges are detected within the same timer
count cycle.
Address:
$1021
Bit 7
6
EDG4A
0
5
EDG1B
0
4
EDG1A
0
3
EDG2B
0
2
EDG2A
0
1
EDG3B
0
Bit 0
EDG3A
0
Read:
Write:
Reset:
EDG4B
0
Figure 9-3. Timer Control Register 2 (TCTL2)
EDGxB and EDGxA — Input Capture Edge Control Bits
There are four pairs of these bits. Each pair is cleared to 0 by reset and must be
encoded to configure the corresponding input capture edge detector circuit. IC4
functions only if the I4/O5 bit in the PACTL register is set. Refer to Table 9-2 for
timer control configuration.
Table 9-2. Timer Control Configuration
EDGxB
EDGxA
Configuration
Capture disabled
0
0
1
1
0
1
0
1
Capture on rising edges only
Capture on falling edges only
Capture on any edge
9.3.2 Timer Input Capture Registers
When an edge has been detected and synchronized, the 16-bit free-running
counter value is transferred into the input capture register pair as a single 16-bit
parallel transfer. Timer counter value captures and timer counter incrementing
occur on opposite half-cycles of the phase 2 clock so that the count value is stable
whenever a capture occurs. The timer input capture registers are not affected by
reset. Input capture values can be read from a pair of 8-bit read-only registers. A
read of the high-order byte of an input capture register pair inhibits a new capture
transfer for one bus cycle. If a double-byte read instruction, such as load double
accumulator D (LDD), is used to read the captured value, coherency is assured.
When a new input capture occurs immediately after a high-order byte read, transfer
is delayed for an additional cycle but the value is not lost.
Data Sheet
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M68HC11E Family — Rev. 5
Timing System
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Timing System
Input Capture
Register name: Timer Input Capture 1 Register (High) Address: $1010
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Indeterminate after reset
Register name: Timer Input Capture 1 Register (Low) Address: $1011
Bit 7
6
5
4
3
2
1
Bit 0
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Indeterminate after reset
Figure 9-4. Timer Input Capture 1 Register Pair (TIC1)
Register name: Timer Input Capture 2 Register (High) Address: $1012
Bit 7
6
5
4
3
2
1
Bit 0
Bit 8
Read:
Write:
Reset:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Indeterminate after reset
Register name: Timer Input Capture 2 Register (Low) Address: $1013
Bit 7
6
5
4
3
2
1
Bit 0
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Indeterminate after reset
Figure 9-5. Timer Input Capture 2 Register Pair (TIC2)
Register name: Timer Input Capture 3 Register (High) Address: $1014
Bit 7
6
5
4
3
2
1
Bit 0
Bit 8
Read:
Write:
Reset:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Indeterminate after reset
Register name: Timer Input Capture 3 Register (Low) Address: $1015
Bit 7
6
5
4
3
2
1
Bit 0
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Indeterminate after reset
Figure 9-6. Timer Input Capture 3 Register Pair (TIC3)
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Timing System
9.3.3 Timer Input Capture 4/Output Compare 5 Register
Use TI4/O5 as either an input capture register or an output compare register,
depending on the function chosen for the PA3 pin. To enable it as an input capture
pin, set the I4/O5 bit in the pulse accumulator control register (PACTL) to logic
level 1. To use it as an output compare register, set the I4/O5 bit to a logic level 0.
Refer to 9.7 Pulse Accumulator.
Register name: Timer Input Capture 4/Output Compare 5 (High) Address: $101E
Bit 7
Bit 15
1
6
Bit 14
1
5
Bit 13
1
4
Bit 12
1
3
Bit 11
1
2
Bit 10
1
1
Bit 9
1
Bit 0
Bit 8
1
Read:
Write:
Reset:
Register name: Timer Input Capture 4/Output Compare 5 (Low) Address: $101F
Bit 7
Bit 7
1
6
Bit 6
1
5
Bit 5
1
4
Bit 4
1
3
Bit 3
1
2
Bit 2
1
1
Bit 1
1
Bit 0
Bit 0
1
Read:
Write:
Reset:
Figure 9-7. Timer Input Capture 4/Output
Compare 5 Register Pair (TI4/O5)
9.4 Output Compare
Use the output compare (OC) function to program an action to occur at a specific
time — when the 16-bit counter reaches a specified value. For each of the five
output compare functions, there is a separate 16-bit compare register and a
dedicated 16-bit comparator. The value in the compare register is compared to the
value of the free-running counter on every bus cycle. When the compare register
matches the counter value, an output compare status flag is set. The flag can be
used to initiate the automatic actions for that output compare function.
To produce a pulse of a specific duration, write a value to the output compare
register that represents the time the leading edge of the pulse is to occur. The
output compare circuit is configured to set the appropriate output either high or low,
depending on the polarity of the pulse being produced. After a match occurs, the
output compare register is reprogrammed to change the output pin back to its
inactive level at the next match. A value representing the width of the pulse is
added to the original value, and then written to the output compare register.
Because the pin state changes occur at specific values of the free-running counter,
the pulse width can be controlled accurately at the resolution of the free-running
counter, independent of software latencies. To generate an output signal of a
specific frequency and duty cycle, repeat this pulse-generating procedure.
The five 16-bit read/write output compare registers are: TOC1, TOC2, TOC3, and
TOC4, and the TI4/O5. TI4/O5 functions under software control as either IC4 or
OC5. Each of the OC registers is set to $FFFF on reset. A value written to an OC
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register is compared to the free-running counter value during each E-clock cycle.
If a match is found, the particular output compare flag is set in timer interrupt flag
register 1 (TFLG1). If that particular interrupt is enabled in the timer interrupt mask
register 1 (TMSK1), an interrupt is generated. In addition to an interrupt, a specified
action can be initiated at one or more timer output pins. For OC[5:2], the pin action
is controlled by pairs of bits (OMx and OLx) in the TCTL1 register. The output
action is taken on each successful compare, regardless of whether or not the OCxF
flag in the TFLG1 register was previously cleared.
OC1 is different from the other output compares in that a successful OC1 compare
can affect any or all five of the OC pins. The OC1 output action taken when a match
is found is controlled by two 8-bit registers with three bits unimplemented: the
output compare 1 mask register, OC1M, and the output compare 1 data register,
OC1D. OC1M specifies which port A outputs are to be used, and OC1D specifies
what data is placed on these port pins.
9.4.1 Timer Output Compare Registers
All output compare registers are 16-bit read-write. Each is initialized to $FFFF at
reset. If an output compare register is not used for an output compare function, it
can be used as a storage location. A write to the high-order byte of an output
compare register pair inhibits the output compare function for one bus cycle. This
inhibition prevents inappropriate subsequent comparisons. Coherency requires a
complete 16-bit read or write. However, if coherency is not needed, byte accesses
can be used.
For output compare functions, write a comparison value to output compare
registers TOC1–TOC4 and TI4/O5. When TCNT value matches the comparison
value, specified pin actions occur.
Register name: Timer Output Compare 1 Register (High) Address: $1016
Bit 7
Bit 15
1
6
Bit 14
1
5
Bit 13
1
4
Bit 12
1
3
Bit 11
1
2
Bit 10
1
1
Bit 9
1
Bit 0
Bit 8
1
Read:
Write:
Reset:
Register name: Timer Output Compare 1 Register (Low) Address: $1017
Bit 7
Bit 7
1
6
Bit 6
1
5
Bit 5
1
4
Bit 4
1
3
Bit 3
1
2
Bit 2
1
1
Bit 1
1
Bit 0
Bit 0
1
Read:
Write:
Reset:
Figure 9-8. Timer Output Compare 1 Register Pair (TOC1)
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Register name: Timer Output Compare 2 Register (High) Address: $1018
Bit 7
Bit 15
1
6
Bit 14
1
5
Bit 13
1
4
Bit 12
1
3
Bit 11
1
2
Bit 10
1
1
Bit 9
1
Bit 0
Bit 8
1
Read:
Write:
Reset:
Register name: Timer Output Compare 2 Register (Low) Address: $1019
Bit 7
Bit 7
1
6
Bit 6
1
5
Bit 5
1
4
Bit 4
1
3
Bit 3
1
2
Bit 2
1
1
Bit 1
1
Bit 0
Bit 0
1
Read:
Write:
Reset:
Figure 9-9. Timer Output Compare 2 Register Pair (TOC2)
Register name: Timer Output Compare 3 Register (High) Address: $101A
Bit 7
Bit 15
1
6
Bit 14
1
5
Bit 13
1
4
Bit 12
1
3
Bit 11
1
2
Bit 10
1
1
Bit 9
1
Bit 0
Bit 8
1
Read:
Write:
Reset:
Register name: Timer Output Compare 3 Register (Low) Address: $101B
Bit 7
Bit 7
1
6
Bit 6
1
5
Bit 5
1
4
Bit 4
1
3
Bit 3
1
2
Bit 2
1
1
Bit 1
1
Bit 0
Bit 0
1
Read:
Write:
Reset:
Figure 9-10. Timer Output Compare 3 Register Pair (TOC3)
Register name: Timer Output Compare 4 Register (High) Address: $101C
Bit 7
Bit 15
1
6
Bit 14
1
5
Bit 13
1
4
Bit 12
1
3
Bit 11
1
2
Bit 10
1
1
Bit 9
1
Bit 0
Bit 8
1
Read:
Write:
Reset:
Register name: Timer Output Compare 4 Register (Low) Address: $101D
Bit 7
Bit 7
1
6
Bit 6
1
5
Bit 5
1
4
Bit 4
1
3
Bit 3
1
2
Bit 2
1
1
Bit 1
1
Bit 0
Bit 0
1
Read:
Write:
Reset:
Figure 9-11. Timer Output Compare 4 Register Pair (TOC4)
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9.4.2 Timer Compare Force Register
The CFORC register allows forced early compares. FOC[1:5] correspond to the
five output compares. These bits are set for each output compare that is to be
forced. The action taken as a result of a forced compare is the same as if there
were a match between the OCx register and the free-running counter, except that
the corresponding interrupt status flag bits are not set. The forced channels trigger
their programmed pin actions to occur at the next timer count transition after the
write to CFORC.
The CFORC bits should not be used on an output compare function that is
programmed to toggle its output on a successful compare because a normal
compare that occurs immediately before or after the force can result in an
undesirable operation.
Address:
$100B
Bit 7
6
FOC2
0
5
FOC3
0
4
FOC4
0
3
FOC5
0
2
0
1
0
Bit 0
Read:
Write:
Reset:
FOC1
0
0
= Unimplemented
Figure 9-12. Timer Compare Force Register (CFORC)
FOC[1:5] — Force Output Comparison Bit
When the FOC bit associated with an output compare circuit is set, the output
compare circuit immediately performs the action it is programmed to do when
an output match occurs.
0 = Not affected
1 = Output x action occurs
Bits [2:0] — Unimplemented
Always read 0
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9.4.3 Output Compare Mask Register
Use OC1M with OC1 to specify the bits of port A that are affected by a successful
OC1 compare. The bits of the OC1M register correspond to PA[7:3].
Address:
$100C
Bit 7
6
OC1M6
0
5
OC1M5
0
4
OC1M4
0
3
OC1M3
0
2
0
1
0
Bit 0
Read:
Write:
Reset:
OC1M7
0
0
= Unimplemented
Figure 9-13. Output Compare 1 Mask Register (OC1M)
OC1M[7:3] — Output Compare Masks
0 = OC1 disabled
1 = OC1 enabled to control the corresponding pin of port A
Bits [2:0] — Unimplemented
Always read 0
9.4.4 Output Compare Data Register
Use this register with OC1 to specify the data that is to be stored on the affected
pin of port A after a successful OC1 compare. When a successful OC1 compare
occurs, a data bit in OC1D is stored in the corresponding bit of port A for each bit
that is set in OC1M.
Address:
$100D
Bit 7
6
OC1D6
0
5
OC1D5
0
4
OC1D4
0
3
OC1D3
0
2
0
1
0
Bit 0
Read:
Write:
Reset:
OC1D7
0
0
= Unimplemented
Figure 9-14. Output Compare 1 Data Register (OC1D)
If OC1Mx is set, data in OC1Dx is output to port A bit x on successful OC1
compares.
Bits [2:0] — Unimplemented
Always read 0
9.4.5 Timer Counter Register
The 16-bit read-only TCNT register contains the prescaled value of the 16-bit timer.
A full counter read addresses the most significant byte (MSB) first. A read of this
address causes the least significant byte (LSB) to be latched into a buffer for the
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next CPU cycle so that a double-byte read returns the full 16-bit state of the counter
at the time of the MSB read cycle.
Register name: Timer Counter Register (High) Address: $100E
Bit 7
6
5
4
3
2
1
Bit 0
Bit 8
Read:
Write:
Reset:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
0
0
0
0
0
0
0
0
Register name: Timer Counter Register (Low) Address: $100F
Bit 7
Bit 7
6
5
4
3
2
1
Bit 0
Bit 0
Read:
Write:
Reset:
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
0
0
0
0
0
0
0
0
= Unimplemented
Figure 9-15. Timer Counter Register (TCNT)
9.4.6 Timer Control Register 1
The bits of this register specify the action taken as a result of a successful OCx
compare.
Address:
$1020
Bit 7
6
OL2
0
5
OM3
0
4
OL3
0
3
OM4
0
2
OL4
0
1
OM5
0
Bit 0
OL5
0
Read:
Write:
Reset:
OM2
0
Figure 9-16. Timer Control Register 1 (TCTL1)
OM[2:5] — Output Mode Bits
OL[2:5] — Output Level Bits
These control bit pairs are encoded to specify the action taken after a successful
OCx compare. OC5 functions only if the I4/O5 bit in the PACTL register is clear.
Refer to Table 9-3 for the coding.
Table 9-3. Timer Output Compare Actions
OMx
OLx
Action Taken on Successful Compare
Timer disconnected from output pin logic
Toggle OCx output line
0
0
1
1
0
1
0
1
Clear OCx output line to 0
Set OCx output line to 1
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9.4.7 Timer Interrupt Mask 1 Register
Use this 8-bit register to enable or inhibit the timer input capture and output
compare interrupts.
Address:
$1022
Bit 7
6
OC2I
0
5
OC3I
0
4
OC4I
0
3
I4/O5I
0
2
IC1I
0
1
IC2I
0
Bit 0
IC3I
0
Read:
Write:
Reset:
OC1I
0
Figure 9-17. Timer Interrupt Mask 1 Register (TMSK1)
OC1I–OC4I — Output Compare x Interrupt Enable Bits
If the OCxI enable bit is set when the OCxF flag bit is set, a hardware interrupt
sequence is requested.
I4/O5I — Input Capture 4/Output Compare 5 Interrupt Enable Bit
When I4/O5 in PACTL is 1, I4/O5I is the input capture 4 interrupt enable bit.
When I4/O5 in PACTL is 0, I4/O5I is the output compare 5 interrupt enable bit.
IC1I–IC3I — Input Capture x Interrupt Enable Bits
If the ICxI enable bit is set when the ICxF flag bit is set, a hardware interrupt
sequence is requested.
NOTE:
Bits in TMSK1 correspond bit for bit with flag bits in TFLG1. Bits in TMSK1 enable
the corresponding interrupt sources.
9.4.8 Timer Interrupt Flag 1 Register
Bits in this register indicate when timer system events have occurred. Coupled with
the bits of TMSK1, the bits of TFLG1 allow the timer subsystem to operate in either
a polled or interrupt driven system. Each bit of TFLG1 corresponds to a bit in
TMSK1 in the same position.
Address:
$1023
Bit 7
6
OC2F
0
5
OC3F
0
4
OC4F
0
3
I4/O5F
0
2
IC1F
0
1
IC2F
0
Bit 0
IC3F
0
Read:
Write:
Reset:
OC1F
0
Figure 9-18. Timer Interrupt Flag 1 Register (TFLG1)
Clear flags by writing a 1 to the corresponding bit position(s).
OC1F–OC4F — Output Compare x Flag
Set each time the counter matches output compare x value
I4/O5F — Input Capture 4/Output Compare 5 Flag
Set by IC4 or OC5, depending on the function enabled by I4/O5 bit in PACTL
IC1F–IC3F — Input Capture x Flag
Set each time a selected active edge is detected on the ICx input line
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9.4.9 Timer Interrupt Mask 2 Register
Use this 8-bit register to enable or inhibit timer overflow and real-time interrupts.
The timer prescaler control bits are included in this register.
Address:
$1024
Bit 7
6
RTII
0
5
PAOVI
0
4
PAII
0
3
0
2
0
1
PR1
0
Bit 0
PR0
0
Read:
Write:
Reset:
TOI
0
= Unimplemented
Figure 9-19. Timer Interrupt Mask 2 Register (TMSK2)
TOI — Timer Overflow Interrupt Enable Bit
0 = TOF interrupts disabled
1 = Interrupt requested when TOF is set to 1
RTII — Real-Time Interrupt Enable Bit
Refer to 9.5 Real-Time Interrupt (RTI).
PAOVI — Pulse Accumulator Overflow Interrupt Enable Bit
Refer to 9.7.3 Pulse Accumulator Status and Interrupt Bits.
PAII — Pulse Accumulator Input Edge Interrupt Enable Bit
Refer to 9.7.3 Pulse Accumulator Status and Interrupt Bits.
Bits [3:2] — Unimplemented
Always read 0
PR[1:0] — Timer Prescaler Select Bits
These bits are used to select the prescaler divide-by ratio. In normal modes,
PR[1:0] can be written only once, and the write must be within 64 cycles after
reset. Refer to Table 9-1 and Table 9-4 for specific timing values.
Table 9-4. Timer Prescale
PR[1:0]
0 0
Prescaler
1
4
0 1
1 0
8
1 1
16
NOTE:
Bits in TMSK2 correspond bit for bit with flag bits in TFLG2. Bits in TMSK2 enable
the corresponding interrupt sources.
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9.4.10 Timer Interrupt Flag Register 2
Bits in this register indicate when certain timer system events have occurred.
Coupled with the four high-order bits of TMSK2, the bits of TFLG2 allow the timer
subsystem to operate in either a polled or interrupt driven system. Each bit of
TFLG2 corresponds to a bit in TMSK2 in the same position.
Address:
$1025
Bit 7
6
RTIF
0
5
PAOVF
0
4
PAIF
0
3
0
2
0
1
0
Bit 0
Read:
Write:
Reset:
TOF
0
0
= Unimplemented
Figure 9-20. Timer Interrupt Flag 2 Register (TFLG2)
Clear flags by writing a 1 to the corresponding bit position(s).
TOF — Timer Overflow Interrupt Flag
Set when TCNT changes from $FFFF to $0000
RTIF — Real-Time (Periodic) Interrupt Flag
Refer to 9.5 Real-Time Interrupt (RTI).
PAOVF — Pulse Accumulator Overflow Interrupt Flag
Refer to 9.7 Pulse Accumulator.
PAIF — Pulse Accumulator Input Edge Interrupt Flag
Refer to 9.7 Pulse Accumulator.
Bits [3:0] — Unimplemented
Always read 0
9.5 Real-Time Interrupt (RTI)
The real-time interrupt (RTI) feature, used to generate hardware interrupts at a
fixed periodic rate, is controlled and configured by two bits (RTR1 and RTR0) in the
pulse accumulator control (PACTL) register. The RTII bit in the TMSK2 register
enables the interrupt capability. The four different rates available are a product of
the MCU oscillator frequency and the value of bits RTR[1:0]. Refer to Table 9-5,
which shows the periodic real-time interrupt rates.
Table 9-5. RTI Rates
RTR[1:0]
0 0
E = 3 MHz
2.731 ms
5.461 ms
10.923 ms
21.845 ms
E = 2 MHz
4.096 ms
8.192 ms
16.384 ms
32.768 ms
E = 1 MHz
8.192 ms
E = X MHz
(E/213
(E/214
(E/215
(E/216
)
)
)
)
0 1
16.384 ms
32.768 ms
65.536 ms
1 0
1 1
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Real-Time Interrupt (RTI)
The clock source for the RTI function is a free-running clock that cannot be stopped
or interrupted except by reset. This clock causes the time between successive RTI
timeouts to be a constant that is independent of the software latencies associated
with flag clearing and service. For this reason, an RTI period starts from the
previous timeout, not from when RTIF is cleared.
Every timeout causes the RTIF bit in TFLG2 to be set, and if RTII is set, an interrupt
request is generated. After reset, one entire RTI period elapses before the RTIF
is set for the first time. Refer to the 9.4.9 Timer Interrupt Mask 2 Register,
9.5.2 Timer Interrupt Flag Register 2, and 9.5.3 Pulse Accumulator Control
Register.
9.5.1 Timer Interrupt Mask Register 2
This register contains the real-time interrupt enable bits.
Address:
$1024
Bit 7
6
RTI
0
5
PAOVI
0
4
PAII
0
3
0
2
0
1
PR1
0
Bit 0
PR0
0
Read:
Write:
Reset:
TOI
0
= Unimplemented
Figure 9-21. Timer Interrupt Mask 2 Register (TMSK2)
TOI — Timer Overflow Interrupt Enable Bit
0 = TOF interrupts disabled
1 = Interrupt requested when TOF is set to 1
RTII — Real-Time Interrupt Enable Bit
0 = RTIF interrupts disabled
1 = Interrupt requested when RTIF set to 1
PAOVI — Pulse Accumulator Overflow Interrupt Enable Bit
Refer to 9.7 Pulse Accumulator.
PAII — Pulse Accumulator Input Edge Bit
Refer to 9.7 Pulse Accumulator.
Bits [3:2] — Unimplemented
Always read 0
PR[1:0] — Timer Prescaler Select Bits
Refer to Table 9-4.
NOTE:
Bits in TMSK2 correspond bit for bit with flag bits in TFLG2. Bits in TMSK2 enable
the corresponding interrupt sources.
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9.5.2 Timer Interrupt Flag Register 2
Bits of this register indicate the occurrence of timer system events. Coupled with
the four high-order bits of TMSK2, the bits of TFLG2 allow the timer subsystem to
operate in either a polled or interrupt driven system. Each bit of TFLG2
corresponds to a bit in TMSK2 in the same position.
Address:
$1025
Bit 7
6
RTIF
0
5
PAOVF
0
4
PAIF
0
3
0
2
0
1
0
Bit 0
Read:
Write:
Reset:
TOF
0
0
= Unimplemented
Figure 9-22. Timer Interrupt Flag 2 Register (TFLG2)
Clear flags by writing a 1 to the corresponding bit position(s).
TOF — Timer Overflow Interrupt Flag
Set when TCNT changes from $FFFF to $0000
RTIF — Real-Time Interrupt Flag
The RTIF status bit is automatically set to 1 at the end of every RTI period. To
clear RTIF, write a byte to TFLG2 with bit 6 set.
PAOVF — Pulse Accumulator Overflow Interrupt Flag
Refer to 9.7 Pulse Accumulator.
PAIF — Pulse Accumulator Input Edge Interrupt Flag
Refer to 9.7 Pulse Accumulator.
Bits [3:0] — Unimplemented
Always read 0
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Computer Operating Properly (COP) Watchdog Function
9.5.3 Pulse Accumulator Control Register
Bits RTR[1:0] of this register select the rate for the RTI system. The remaining bits
control the pulse accumulator and IC4/OC5 functions.
Address:
$1026
Bit 7
6
PAEN
0
5
PAMOD
0
4
PEDGE
0
3
DDRA3
0
2
I4/O5
0
1
RTR1
0
Bit 0
RTR0
0
Read:
Write:
Reset:
DDRA7
0
Figure 9-23. Pulse Accumulator Control Register (PACTL)
DDRA7 — Data Direction for Port A Bit 7
Refer to Section 6. Parallel Input/Output (I/O) Ports.
PAEN — Pulse Accumulator System Enable Bit
Refer to 9.7 Pulse Accumulator.
PAMOD — Pulse Accumulator Mode Bit
Refer to 9.7 Pulse Accumulator.
PEDGE — Pulse Accumulator Edge Control Bit
Refer to 9.7 Pulse Accumulator.
DDRA3 — Data Direction for Port A Bit 3
Refer to Section 6. Parallel Input/Output (I/O) Ports.
I4/O5 — Input Capture 4/Output Compare Bit
Refer to 9.7 Pulse Accumulator.
RTR[1:0] — RTI Interrupt Rate Select Bits
These two bits determine the rate at which the RTI system requests interrupts.
The RTI system is driven by an E divided by 213 rate clock that is compensated
so it is independent of the timer prescaler. These two control bits select an
additional division factor. Refer to Table 9-5.
9.6 Computer Operating Properly (COP) Watchdog Function
The clocking chain for the COP function, tapped off of the main timer divider chain,
is only superficially related to the main timer system. The CR[1:0] bits in the
OPTION register and the NOCOP bit in the CONFIG register determine the status
of the COP function. One additional register, COPRST, is used to arm and clear
the COP watchdog reset system. Refer to Section 5. Resets and Interrupts for a
more detailed discussion of the COP function.
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9.7 Pulse Accumulator
The M68HC11 Family of MCUs has an 8-bit counter that can be configured to
operate either as a simple event counter or for gated time accumulation, depending
on the state of the PAMOD bit in the PACTL register. Refer to the pulse
accumulator block diagram, Figure 9-24. In the event counting mode, the 8-bit
counter is clocked to increasing values by an external pin. The maximum clocking
rate for the external event counting mode is the E clock divided by two. In gated
time accumulation mode, a free-running E-clock divide-by-64 signal drives the 8-bit
counter, but only while the external PAI pin is activated. Refer to Table 9-6. The
pulse accumulator counter can be read or written at any time.
PAOVI
PAOVF
1
INTERRUPT
REQUESTS
PAII
PAIF
2
E ÷ 64 CLOCK
FROM MAIN TIMER
TMSK2 INT ENABLES
TFLG2 INTERRUPT STATUS
PAI EDGE
PAEN
DISABLE
FLAG SETTING
OVERFLOW
MCU PIN
CLOCK
PAEN
2 1
:
MUX
PA7/
PAI/
OC1
INPUT BUFFER
AND
EDGE DETECTOR
PACNT 8-BIT COUNTER
ENABLE
DATA
BUS
OUTPUT
BUFFER
FROM
MAIN TIMER
OC1
FROM
DDRA7
PACTL CONTROL
INTERNAL
DATA BUS
Figure 9-24. Pulse Accumulator
Data Sheet
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Timing System
Pulse Accumulator
Table 9-6. Pulse Accumulator Timing
Crystal
Frequency
PACNT
Overflow
E Clock
Cycle Time
E ÷ 64
4.0 MHz
1 MHz
2 MHz
3 MHz
1000 ns
500 ns
333 ns
64 µs
32 µs
16.384 ms
8.192 ms
5.461 ms
8.0 MHz
12.0 MHz
21.33 µs
Pulse accumulator control bits are also located within two timer registers, TMSK2
and TFLG2, as described in the following paragraphs.
9.7.1 Pulse Accumulator Control Register
Four of this register’s bits control an 8-bit pulse accumulator system. Another bit
enables either the OC5 function or the IC4 function, while two other bits select the
rate for the real-time interrupt system.
Address:
$1026
Bit 7
6
PAEN
0
5
PAMOD
0
4
PEDGE
0
3
DDRA3
0
2
I4/O5
0
1
RTR1
0
Bit 0
RTR0
0
Read:
Write:
Reset:
DDRA7
0
Figure 9-25. Pulse Accumulator Control Register (PACTL)
DDRA7 — Data Direction for Port A Bit 7
Refer to Section 6. Parallel Input/Output (I/O) Ports.
PAEN — Pulse Accumulator System Enable Bit
0 = Pulse accumulator disabled
1 = Pulse accumulator enabled
PAMOD — Pulse Accumulator Mode Bit
0 = Event counter
1 = Gated time accumulation
PEDGE — Pulse Accumulator Edge Control Bit
This bit has different meanings depending on the state of the PAMOD bit, as
shown in Table 9-7.
Table 9-7. Pulse Accumulator Edge Control
PAMOD
PEDGE
Action on Clock
PAI falling edge increments the counter.
PAI rising edge increments the counter.
A 0 on PAI inhibits counting.
0
0
1
1
0
1
0
1
A 1 on PAI inhibits counting.
M68HC11E Family — Rev. 5
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Data Sheet
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Timing System
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Timing System
DDRA3 — Data Direction for Port A Bit 3
Refer to Section 6. Parallel Input/Output (I/O) Ports.
I4/O5 — Input Capture 4/Output Compare 5 Bit
0 = Output compare 5 function enable (no IC4)
1 = Input capture 4 function enable (no OC5)
RTR[1:0] — RTI Interrupt Rate Select Bits
Refer to 9.5 Real-Time Interrupt (RTI).
9.7.2 Pulse Accumulator Count Register
This 8-bit read/write register contains the count of external input events at the PAI
input or the accumulated count. The PACNT is readable even if PAI is not active in
gated time accumulation mode. The counter is not affected by reset and can be
read or written at any time. Counting is synchronized to the internal PH2 clock so
that incrementing and reading occur during opposite half cycles.
Address:
$1027
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Indeterminate after reset
Figure 9-26. Pulse Accumulator Count Register (PACNT)
9.7.3 Pulse Accumulator Status and Interrupt Bits
The pulse accumulator control bits, PAOVI and PAII, PAOVF and PAIF, are located
within timer registers TMSK2 and TFLG2.
Address:
$1024
Bit 7
6
RTII
0
5
PAOVI
0
4
PAII
0
3
0
2
0
1
PR1
0
Bit 0
PR0
0
Read:
Write:
Reset:
TOI
0
= Unimplemented
Figure 9-27. Timer Interrupt Mask 2 Register (TMSK2)
Address:
$1025
Bit 7
TOF
0
6
RTIF
0
5
PAOVF
0
4
PAIF
0
3
0
2
0
1
0
Bit 0
Read:
Write:
Reset:
0
= Unimplemented
Figure 9-28. Timer Interrupt Flag 2 Register (TFLG2)
Data Sheet
162
M68HC11E Family — Rev. 5
MOTOROLA
Timing System
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Timing System
Pulse Accumulator
PAOVI and PAOVF — Pulse Accumulator Interrupt Enable and Overflow Flag
The PAOVF status bit is set each time the pulse accumulator count rolls over
from $FF to $00. To clear this status bit, write a 1 in the corresponding data bit
position (bit 5) of the TFLG2 register. The PAOVI control bit allows configuring
the pulse accumulator overflow for polled or interrupt-driven operation and does
not affect the state of PAOVF. When PAOVI is 0, pulse accumulator overflow
interrupts are inhibited, and the system operates in a polled mode, which
requires that PAOVF be polled by user software to determine when an overflow
has occurred. When the PAOVI control bit is set, a hardware interrupt request
is generated each time PAOVF is set. Before leaving the interrupt service
routine, software must clear PAOVF by writing to the TFLG2 register.
PAII and PAIF — Pulse Accumulator Input Edge Interrupt Enable Bit and Flag
The PAIF status bit is automatically set each time a selected edge is detected
at the PA7/PAI/OC1 pin. To clear this status bit, write to the TFLG2 register with
a 1 in the corresponding data bit position (bit 4). The PAII control bit allows
configuring the pulse accumulator input edge detect for polled or
interrupt-driven operation but does not affect setting or clearing the PAIF bit.
When PAII is 0, pulse accumulator input interrupts are inhibited, and the system
operates in a polled mode. In this mode, the PAIF bit must be polled by user
software to determine when an edge has occurred. When the PAII control bit is
set, a hardware interrupt request is generated each time PAIF is set. Before
leaving the interrupt service routine, software must clear PAIF by writing to the
TFLG2 register.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
163
Timing System
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Timing System
Data Sheet
164
M68HC11E Family — Rev. 5
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Timing System
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Data Sheet — M68HC11E Family
Section 10. Electrical Characteristics
10.1 Introduction
This section contains electrical specifications for the M68HC11 E-series devices.
10.2 Maximum Ratings for Standard and Extended Voltage Devices
Maximum ratings are the extreme limits to which the MCU can be exposed without
permanently damaging it.
NOTE:
This device is not guaranteed to operate properly at the maximum ratings.
Refer to 10.5 DC Electrical Characteristics, 10.6 Supply Currents and Power
Dissipation, 10.7 MC68L11E9/E20 DC Electrical Characteristics, and
10.8 MC68L11E9/E20 Supply Currents and Power Dissipation for guaranteed
operating conditions.
Rating
Symbol
Value
Unit
V
VDD
Supply voltage
Input voltage
–0.3 to +7.0
–0.3 to +7.0
VIn
V
Current drain per pin(1) excluding VDD, VSS, AVDD
,
ID
25
mA
VRH, VRL, and XIRQ/VPPE
TSTG
Storage temperature
–55 to +150
°C
1. One pin at a time, observing maximum power dissipation limits
NOTE:
This device contains circuitry to protect the inputs against damage due to high
static voltages or electric fields; however, it is advised that normal precautions be
taken to avoid application of any voltage higher than maximum-rated voltages to
this high-impedance circuit. For proper operation, it is recommended that VIn and
VOut be constrained to the range VSS ≤ (VIn or VOut) ≤ VDD. Reliability of operation
is enhanced if unused inputs are connected to an appropriate logic voltage level
(for example, either VSS or VDD).
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
165
Electrical Characteristics
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Electrical Characteristics
10.3 Functional Operating Range
Rating
Symbol
Value
Unit
°C
TL to TH
Operating temperature range
MC68HC(7)11Ex
MC68HC(7)11ExC
MC68HC(7)11ExV
MC68HC(7)11ExM
MC68HC811E2
0 to +70
–40 to +85
–40 to +105
–40 to +125
0 to +70
TA
MC68HC811E2C
MC68HC811E2V
MC68HC811E2M
MC68L11Ex
–40 to +85
–40 to +105
–40 to +125
–20 to +70
VDD
Operating voltage range
5.0 ± 10%
V
10.4 Thermal Characteristics
Characteristic
Average junction temperature
Ambient temperature
Symbol
Value
Unit
°C
TJ
TA + (PD × ΘJA)
TA
User-determined
°C
Package thermal resistance (junction-to-ambient)
48-pin plastic DIP (MC68HC811E2 only)
56-pin plastic SDIP
52-pin plastic leaded chip carrier
52-pin plastic thin quad flat pack (TQFP)
64-pin quad flat pack
50
50
50
85
85
ΘJA
°C/W
P
INT + PI/O
Total power dissipation(1)
PD
W
K / TJ + 273°C
PINT
PI/O
I
DD × VDD
Device internal power dissipation
I/O pin power dissipation(2)
W
W
User-determined
P
D × (TA + 273°C)
A constant(3)
K
W/°C
2
+ ΘJA × PD
1. This is an approximate value, neglecting PI/O
.
2. For most applications, PI/O ≤ PINT and can be neglected.
3. K is a constant pertaining to the device. Solve for K with a known TA and a measured PD (at equilibrium). Use this value
of K to solve for PD and TJ iteratively for any value of TA.
Data Sheet
166
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
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Electrical Characteristics
DC Electrical Characteristics
10.5 DC Electrical Characteristics
Characteristics(1)
Symbol
Min
Max
Unit
Output voltage(2)
ILoad = ±±10.0 µA
VOL, VOH
V
—
0.1
—
All outputs except XTAL
All outputs except XTAL, RESET, and MODA
VDD –0.1
Output high voltage(2)
ILoad = –0.8 mA, VDD = 4.5 V
VOH
VDD –0.8
—
V
V
All outputs except XTAL, RESET, and MODA
Output low voltage
I
Load = 1.6 mA
VOL
—
0.4
All outputs except XTAL
Input high voltage
All inputs except RESET
RESET
0.7 × V
VDD + 0.3
VDD + 0.3
DD
VIH
VIL
V
V
0.8 × V
DD
VSS –0.3
—
0.2 × VDD
Input low voltage, all inputs
I/O ports, 3-state leakage
VIn = VIH or VIL
IOZ
±10
µA
µA
PA7, PA3, PC[7:0], PD[5:0], AS/STRA,
MODA/LIR, RESET
Input leakage current(3)
VIn = VDD or VSS
IIn
—
—
±1
±10
PA[2:0], IRQ, XIRQ
MODB/VSTBY (XIRQ on EPROM-based devices)
VSB
ISB
VDD
10
RAM standby voltage, power down
RAM standby current, power down
4.0
—
V
µA
Input capacitance
CIn
CL
PA[2:0], PE[7:0], IRQ, XIRQ, EXTAL
PA7, PA3, PC[7:0], PD[5:0], AS/STRA, MODA/LIR, RESET
—
—
8
12
pF
pF
Output load capacitance
All outputs except PD[4:1]
PD[4:1]
—
—
90
100
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted
2. VOH specification for RESET and MODA is not applicable because they are open-drain pins. VOH specification not
applicable to ports C and D in wired-OR mode.
3. Refer to 10.13 Analog-to-Digital Converter Characteristics and 10.14 MC68L11E9/E20 Analog-to-Digital Converter
Characteristics for leakage current for port E.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
167
Electrical Characteristics
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Electrical Characteristics
10.6 Supply Currents and Power Dissipation
Characteristics(1)
Symbol
Min
Max
Unit
Run maximum total supply current(2)
Single-chip mode2 MHz
3 MHz
Expanded multiplexed mode2 MHz
3 MHz
—
—
—
—
15
27
27
35
IDD
mA
Wait maximum total supply current(2)
(all peripheral functions shut down)
Single-chip mode2 MHz
3 MHz
Expanded multiplexed mode2 MHz
3 MHz
—
—
—
—
6
WIDD
15
10
20
mA
Stop maximum total supply current(2)
Single-chip mode, no clocks–40°C to +85°C
> +85°C to +105°C
—
—
—
25
50
100
SIDD
µA
> +105°C to +125°C
Maximum power dissipation
Single-chip mode2 MHz
3 MHz
Expanded multiplexed mode2 MHz
3 MHz
—
—
—
—
85
PD
150
150
195
mW
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted
2. EXTAL is driven with a square wave, and
tCYC= 500 ns for 2 MHz rating
t
V
CYC= 333 ns for 3 MHz rating
IL ≤ 0.2 V
VIH ≥ VDD – 0.2 V
no dc loads
Data Sheet
168
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
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Electrical Characteristics
MC68L11E9/E20 DC Electrical Characteristics
10.7 MC68L11E9/E20 DC Electrical Characteristics
Characteristics(1)
Symbol
Min
Max
Unit
Output voltage(2)
ILoad = ±±10.0 µA
V OL, VOH
—
0.1
—
V
All outputs except XTAL
All outputs except XTAL, RESET, and MODA
VDD –0.1
Output high voltage(2)
ILoad = –0.5 mA, VDD = 3.0 V
VOH
VDD –0.8
—
V
V
ILoad = –0.8 mA, VDD = 4.5 V
All outputs except XTAL, RESET, and MODA
Output low voltage
I
Load = 1.6 mA, VDD = 5.0 V
VOL
—
0.4
ILoad = 1.0 mA, VDD = 3.0 V
All outputs except XTAL
Input high voltage
All inputs except RESET
RESET
VDD + 0.3
VDD + 0.3
0.7 × V
VIH
VIL
V
V
DD
0.8 × V
DD
VSS –0.3
—
0.2 × VDD
Input low voltage, all inputs
I/O ports, 3-state leakage
VIn = VIH or VIL
IOZ
±10
µA
µA
PA7, PA3, PC[7:0], PD[5:0], AS/STRA,
MODA/LIR, RESET
Input leakage current(3)
VIn = VDD or VSS
IIn
—
—
±1
±10
PA[2:0], IRQ, XIRQ
MODB/VSTBY (XIRQ on EPROM-based devices)
VSB
ISB
VDD
10
RAM standby voltage, power down
RAM standby current, power down
2.0
—
V
µA
Input capacitance
PA[2:0], PE[7:0], IRQ, XIRQ, EXTAL
PA7, PA3, PC[7:0], PD[5:0], AS/STRA, MODA/LIR, RESET
l
—
—
8
12
pF
pF
Output load capacitance
All outputs except PD[4:1]
PD[4:1]
CL
—
—
90
100
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted
2. VOH specification for RESET and MODA is not applicable because they are open-drain pins. VOH specification not
applicable to ports C and D in wired-OR mode.
3. Refer to 10.13 Analog-to-Digital Converter Characteristics and 10.14 MC68L11E9/E20 Analog-to-Digital Converter
Characteristics for leakage current for port E.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
169
Electrical Characteristics
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Electrical Characteristics
10.8 MC68L11E9/E20 Supply Currents and Power Dissipation
Characteristic(1)
Run maximum total supply current(2)
Symbol
1 MHz
2 MHz
Unit
Single-chip mode
VDD = 5.5 V
8
4
15
8
IDD
VDD = 3.0 V
mA
Expanded multiplexed mode
VDD = 5.5 V
14
7
27
14
VDD = 5.5 V
Wait maximum total supply current(2)
(all peripheral functions shut down)
Single-chip mode
V
DD = 5.5 V
3
1.5
6
3
WIDD
mA
VDD = 3.0 V
Expanded multiplexed mode
VDD = 5.5 V
5
2.5
10
5
VDD = 3.0 V
Stop maximum total supply current(2)
Single-chip mode, no clocks
VDD = 5.5 V
SIDD
µA
50
25
50
25
VDD = 3.0 V
Maximum power dissipation
Single-chip mode
2 MHz
3 MHz
44
12
85
24
PD
mW
Expanded multiplexed mode
2 MHz
3 MHz
77
21
150
42
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted
2. EXTAL is driven with a square wave, and
tCYC= 500 ns for 2 MHz rating
t
V
CYC= 333 ns for 3 MHz rating
IL ≤ 0.2 V
VIH ≥ VDD – 0.2 V
no dc loads
Data Sheet
170
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
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Electrical Characteristics
MC68L11E9/E20 Supply Currents and Power Dissipation
V
~ DD
CLOCKS,
STROBES
V
– 0.8 VOLTS
NOM
DD
0.4 VOLTS
0.4 VOLTS
NOM
~V
SS
70% of V
20% of V
DD
INPUTS
DD
NOMINAL TIMING
V
~
DD
V
– 0.8 Volts
DD
OUTPUTS
0.4 Volts
~V
SS
DC TESTING
~V
DD
70% of V
SPEC
CLOCKS,
STROBES
DD
20% of V
20% of V
SPEC
DD
DD
V
~ SS
(NOTE 2)
V
– 0.8 VOLTS
DD
70% of V
DD
INPUTS
20% of V
DD
0.4 VOLTS
SPEC TIMING
V
~ DD
70% of V
20% of V
DD
DD
OUTPUTS
V
~ SS
AC TESTING
Notes:
1. Full test loads are applied during all dc electrical tests and ac timing measurements.
2. During ac timing measurements, inputs are driven to 0.4 volts and VDD – 0.8 volts while timing
measurements are taken at 20% and 70% of VDD points.
Figure 10-1. Test Methods
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
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Electrical Characteristics
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Electrical Characteristics
10.9 Control Timing
1.0 MHz
2.0 MHz
3.0 MHz
Characteristic(1) (2)
Symbol
Unit
Min Max Min Max Min Max
fo
Frequency of operation
E-clock period
dc
1000
—
1.0
—
dc
500
—
2.0
—
dc
333
—
3.0
—
MHz
ns
tCYC
fXTAL
4 fo
Crystal frequency
4.0
4.0
8.0
8.0
12.0
12.0
MHz
MHz
External oscillator frequency
dc
dc
dc
Processor control setup time
tPCSU = 1/4 tCYC+ 50 ns
tPCSU
300
—
175
—
133
—
ns
Reset input pulse width
PWRSTL
tCYC
To guarantee external reset vector
Minimum input time (can be pre-empted by internal reset)
8
1
—
—
8
1
—
—
8
1
—
—
tMPS
tMPH
tCYC
ns
Mode programming setup time
Mode programming hold time
2
—
—
2
—
—
2
—
—
10
10
10
Interrupt pulse width, IRQ edge-sensitive mode
PWIRQ = tCYC + 20 ns
PWIRQ
tWRS
1020
—
—
4
520
—
—
4
353
—
—
4
ns
tCYC
Wait recovery startup time
Timer pulse width input capture pulse accumulator input
PWTIM = tCYC + 20 ns
PWTIM
1020
—
520
—
353
—
ns
1. VDD = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. RESET is recognized during the first clock cycle it is held low. Internal circuitry then drives the pin low for four clock cycles,
releases the pin, and samples the pin level two cycles later to determine the source of the interrupt. Refer to Section 5.
Resets and Interrupts for further detail.
Data Sheet
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M68HC11E Family — Rev. 5
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Electrical Characteristics
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Electrical Characteristics
MC68L11E9/E20 Control Timing
10.10 MC68L11E9/E20 Control Timing
1.0 MHz
2.0 MHz
Characteristic(1) (2)
Symbol
Unit
Min
Max
1.0
—
Min
Max
2.0
—
fo
Frequency of operation
E-clock period
dc
1000
—
dc
500
—
MHz
ns
tCYC
fXTAL
4 fo
Crystal frequency
4.0
4.0
8.0
8.0
MHz
MHz
External oscillator frequency
dc
dc
Processor control setup time
tPCSU = 1/4 tCYC+ 75 ns
tPCSU
325
—
200
—
ns
Reset input pulse width
PWRSTL
tCYC
To guarantee external reset vector
Minimum input time (can be pre-empted by internal reset)
8
1
—
—
8
1
—
—
tMPS
tMPH
tCYC
ns
Mode programming setup time
Mode programming hold time
2
—
—
2
—
—
10
10
Interrupt pulse width, IRQ edge-sensitive mode
PWIRQ = tCYC + 20 ns
PWIRQ
tWRS
1020
—
—
4
520
—
—
4
ns
tCYC
Wait recovery startup time
Timer pulse width input capture pulse accumulator input
PWTIM = tCYC + 20 ns
PWTIM
1020
—
520
—
ns
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. RESET is recognized during the first clock cycle it is held low. Internal circuitry then drives the pin low for four clock cycles,
releases the pin, and samples the pin level two cycles later to determine the source of the interrupt. Refer to Section 5.
Resets and Interrupts for further detail.
(1)
PA[2:0]
(2)
PA[2:0]
(1) (3)
PA7
PW
TIM
(2) (3)
PA7
Notes:
1. Rising edge sensitive input
2. Falling edge sensitive input
3. Maximum pulse accumulator clocking rate is E-clock frequency divided by 2.
Figure 10-2. Timer Inputs
M68HC11E Family — Rev. 5
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Data Sheet
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Electrical Characteristics
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Electrical Characteristics
Data Sheet
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Electrical Characteristics
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Electrical Characteristics
MC68L11E9/E20 Control Timing
M68HC11E Family — Rev. 5
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Data Sheet
175
Electrical Characteristics
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Electrical Characteristics
Data Sheet
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Electrical Characteristics
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Electrical Characteristics
MC68L11E9/E20 Control Timing
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Data Sheet
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Electrical Characteristics
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Electrical Characteristics
10.11 Peripheral Port Timing
1.0 MHz
2.0 MHz
3.0 MHz
Characteristic(1) (2)
Symbol
Unit
Min
Max
1.0
—
Min
Max
2.0
—
Min
Max
3.0
—
Frequency of operation
E-clock frequency
fo
dc
dc
dc
MHz
ns
tCYC
tPDSU
tPDH
E-clock period
1000
100
500
100
333
100
Peripheral data setup time
MCU read of ports A, C, D, and E
—
—
—
ns
Peripheral data hold time
MCU read of ports A, C, D, and E
50
—
50
—
50
—
ns
ns
Delay time, peripheral data write
tPWD = 1/4 tCYC+ 100 ns
tPWD
—
—
200
350
—
—
200
225
—
—
200
183
MCU writes to port A
MCU writes to ports B, C, and D
tIS
tIH
Port C input data setup time
Port C input data hold time
60
—
—
60
—
—
60
—
—
ns
ns
100
100
100
Delay time, E fall to STRB
tDEB = 1/4 tCYC+ 100 ns
tDEB
—
350
—
225
—
183
ns
Setup time, STRA asserted to E fall(3)
Delay time, STRA asserted to port C data output valid
Hold time, STRA negated to port C data
3-state hold time
tAES
tPCD
tPCH
tPCZ
0
—
100
—
0
—
100
—
0
—
100
—
ns
ns
ns
ns
—
10
—
—
10
—
—
10
—
150
150
150
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. Ports C and D timing is valid for active drive. (CWOM and DWOM bits are not set in PIOC and SPCR registers,
respectively.)
3. If this setup time is met, STRB acknowledges in the next cycle. If it is not met, the response may be delayed one more cycle.
Data Sheet
178
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
MC68L11E9/E20 Peripheral Port Timing
10.12 MC68L11E9/E20 Peripheral Port Timing
1.0 MHz
2.0 MHz
Characteristic(1) (2)
Symbol
Unit
Min
Max
1.0
—
Min
Max
2.0
—
Frequency of operation
E-clock frequency
fo
dc
dc
MHz
ns
tCYC
tPDSU
tPDH
E-clock period
1000
100
500
100
Peripheral data setup time
MCU read of ports A, C, D, and E
—
—
ns
Peripheral data hold time
MCU read of ports A, C, D, and E
50
—
50
—
ns
ns
Delay time, peripheral data write
tPWD = 1/4 tCYC+ 150 ns
tPWD
—
—
250
400
—
—
250
275
MCU writes to port A
MCU writes to ports B, C, and D
tIS
tIH
Port C input data setup time
Port C input data hold time
60
—
—
60
—
—
ns
ns
100
100
Delay time, E fall to STRB
tDEB = 1/4 tCYC+ 150 ns
tDEB
—
400
—
275
ns
Setup time, STRA asserted to E fall(3)
Delay time, STRA asserted to port C data output valid
Hold time, STRA negated to port C data
3-state hold time
tAES
tPCD
tPCH
tPCZ
0
—
100
—
0
—
100
—
ns
ns
ns
ns
—
10
—
—
10
—
150
150
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. Ports C and D timing is valid for active drive. (CWOM and DWOM bits are not set in PIOC and SPCR registers,
respectively.)
3. If this setup time is met, STRB acknowledges in the next cycle. If it is not met, the response may be delayed one more cycle.
Figure 10-7. Port Read Timing Diagram
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
179
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
Figure 10-8. Port Write Timing Diagram
Figure 10-9. Simple Input Strobe Timing Diagram
MCU WRITE TO PORT B
E
t
t
PWD
NEW DATA VALID
PORT B
PREVIOUS PORT DATA
tDE
B
STRB (OUT)
Figure 10-10. Simple Output Strobe Timing Diagram
(1)
READ PORTCL
E
tDEB
tDEB
“READY”
STRB (0UT)
t
AES
STRA (IN)
tIS
tI
PORT C (IN)
Notes:
1. After reading PIOC with STAF set
2. Figure shows rising edge STRA (EGA = 1) and high true STRB (INVB = 1).
Figure 10-11. Port C Input Handshake Timing Diagram
Data Sheet
180
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
MC68L11E9/E20 Peripheral Port Timing
(1)
WRITE PORTCL
E
t
t
PWD
PORT C (OUT)
PREVIOUS PORT DATA
NEW DATA VALID
t
t
t
DEB
DEB
“READY”
STRB (IN)
t
AES
STRA (IN)
Notes:
1. After reading PIOC with STAF set
2. Figure shows rising edge STRA (EGA = 1) and high true STRB (INVB = 1).
Figure 10-12. Port C Output Handshake Timing Diagram
(1)
READ PORTCL
E
t
PWD
PORT C (OUT)
DDR = 1
t
t
DEB
DEB
“READY”
STRB (OUT)
t
tE
A
S
STRA (IN)
t
PCD
t
PCH
PORT C (OUT)
OLD DATA
D
NEW DATA VALID
DDR = 0
t
P
C
Z
a) STRA ACTIVE BEFORE PORTCL WRITE
STRA (IN)
t
t
t
PCH
t
PCD
PORT C (OUT)
NEW DATA VALID
DDR = 0
t
t
PCZ
b) STRA ACTIVE AFTER PORTCL WRITE
Notes:
1. After reading PIOC with STAF set
2. Figure shows rising edge STRA (EGA = 1) and high true STRB (INVB = 1).
Figure 10-13. 3-State Variation of Output Handshake Timing Diagram
(STRA Enables Output Buffer)
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
181
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
10.13 Analog-to-Digital Converter Characteristics
2.0 MHz 3.0 MHz
Characteristic(1)
Parameter(2)
Min
Absolute
Unit
Max
Max
Resolution
Number of bits resolved by A/D converter
—
—
8
—
—
Bits
Maximum deviation from the ideal A/D transfer
characteristics
Non-linearity
—
±1/2
±1/2
±1/2
±1/2
±1/2
±1
±1
LSB
Difference between the output of an ideal and an
actual for 0 input voltage
Zero error
—
—
—
—
—
—
—
—
LSB
LSB
LSB
LSB
Difference between the output of an ideal and an
actual A/D for full-scale input voltage
Full scale error
±1
Total unadjusted
error
Maximum sum of non-linearity, zero error, and
full-scale error
±1/2
±1/2
Quantization
error
Uncertainty because of converter resolution
Difference between the actual input voltage and the
full-scale weighted equivalent of the binary output
code, all error sources included
Absolute
accuracy
—
—
—
±1
±2
LSB
V
Conversion
range
VRL
VRH
VRH
Analog input voltage range
Maximum analog reference voltage(3)
Minimum analog reference voltage(2)
VRH
VRL
∆VR
VRL
VDD +0.1 VDD +0.1
—
—
—
V
V
V
VSS –0.1
VRH
—
VRH
—
(2)
3
Minimum difference between VRH and VRL
Total time to perform a single A/D conversion:
E clock
Internal RC oscillator
Conversion
time
—
—
tCYC
—
—
32
—
tCYC+32 tCYC+32
µs
Conversion result never decreases with an
increase in input voltage; has no missing codes
Monotonicity
—
00
—
Guaranteed
—
—
—
—
—
Conversion result when VIn = VRL
Conversion result when VIn = VRH
Zero input reading
—
—
Hex
Hex
Full scale
reading
FF
FF
Analog input acquisition sampling time:
E clock
Internal RC oscillator
Sample acquisition
time
tCYC
—
—
12
—
—
12
—
12
µs
Sample/hold
capacitance
Input capacitance during sample
PE[7:0]
—
20 typical
—
—
pF
Input leakage on A/D pins
PE[7:0]
VRL, VRH
Input leakage
—
—
—
—
400
1.0
400
1.0
nA
µA
1. VDD = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH, 750 kHz ≤ E ≤ 3.0 MHz, unless otherwise noted
2. Source impedances greater than 10 kΩ affect accuracy adversely because of input leakage.
3. Performance verified down to 2.5 V ∆VR, but accuracy is tested and guaranteed at ∆VR = 5 V ±10%.
Data Sheet
182
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
MC68L11E9/E20 Analog-to-Digital Converter Characteristics
10.14 MC68L11E9/E20 Analog-to-Digital Converter Characteristics
Characteristic(1)
Parameter(2)
Min
Absolute
Max
Unit
Resolution
Number of bits resolved by A/D converter
—
8
—
Bits
Maximum deviation from the ideal A/D transfer
characteristics
Non-linearity
Zero error
—
—
—
—
—
—
±1
±1
±1
LSB
LSB
LSB
Difference between the output of an ideal and an
actual for 0 input voltage
Difference between the output of an ideal and an
actual A/D for full-scale input voltage
Full scale error
Total unadjusted
error
Maximum sum of non-linearity, zero error, and
full-scale error
—
—
—
—
±1/2
±1/2
LSB
LSB
Quantization error
Uncertainty because of converter resolution
Difference between the actual input voltage and the
full-scale weighted equivalent of the binary output
code, all error sources included
Absolute accuracy
—
—
±2
LSB
VRL
VRL
VRH
VDD + 0.1
VRH
Conversion range
Analog input voltage range
—
—
—
—
V
V
V
V
VRH
VRL
∆VR
Maximum analog reference voltage
Minimum analog reference voltage
Minimum difference between VRH and VRL
VSS –0.1
3.0
—
Total time to perform a single
analog-to-digital conversion:
E clock
Conversion time
Monotonicity
—
tCYC+ 32
tCYC
—
—
32
—
Internal RC oscillator
µs
Conversion result never decreases with an
increase in input voltage and has no missing
codes
—
Guaranteed
—
—
Conversion result when VIn = VRL
Conversion result when VIn = VRH
Zero input reading
Full scale reading
00
—
—
—
—
Hex
Hex
FF
Analog input acquisition sampling time:
E clock
Internal RC oscillator
Sample acquisition
time
tCYC
—
—
12
—
—
12
µs
Sample/hold
capacitance
Input capacitance during sample
PE[7:0]
—
20 typical
—
pF
Input leakage on A/D pins
PE[7:0]
Input leakage
—
—
—
—
400
1.0
nA
µA
VRL, VRH
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, 750 kHz ≤ E ≤ 2.0 MHz, unless otherwise noted
2. Source impedances greater than 10 kΩ affect accuracy adversely because of input leakage.
M68HC11E Family — Rev. 5
Data Sheet
183
MOTOROLA
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
10.15 Expansion Bus Timing Characteristics
1.0 MHz
2.0 MHz
3.0 MHz
Characteristic(1)
Num
Symbol
Unit
Min
dc
Max Min Max Min Max
fo
Frequency of operation (E-clock frequency)
1.0
—
dc
2.0
—
dc
3.0 MHz
tCYC
PWEL
1
2
3
Cycle time
1000
500
227
333
146
—
—
ns
ns
Pulse width, E low(2), PWEL = 1/2 tCYC–23 ns
Pulse width, E high(2), PWEH = 1/2 tCYC–28 ns
477
—
—
PWEH
472
—
—
20
20
—
222
—
—
20
20
—
141
—
—
20
15
—
ns
ns
ns
ns
tr
tf
4a E and AS rise time
4b E and AS fall time
—
—
—
Address hold time(2) (3)a, tAH = 1/8 tCYC–29.5 ns
9
tAH
95.5
33
26
Non-multiplexed address valid time to E rise
tAV = PWEL –(tASD + 80 ns)(2) (3)a
tAV
12
281.5
—
94
—
54
—
ns
tDSR
tDHR
tDDW
17 Read data setup time
30
0
—
30
0
—
83
30
0
—
51
71
ns
ns
ns
Read data hold time, max = tMAD
18
19
21
145.5
190.5
Write data delay time, tDDW = 1/8 tCYC+ 65.5 ns(2) (3)a
Write data hold time, tDHW = 1/8 tCYC–29.5 ns(2) (3)a
—
—
128
tDHW
tAVM
95.5
—
—
33
84
—
—
26
54
—
—
ns
ns
Multiplexed address valid time to E rise
tAVM = PWEL –(tASD + 90 ns)(2) (3)a
22
24
25
271.5
Multiplexed address valid time to AS fall
tASL
151
—
—
26
33
—
—
13
31
—
—
ns
ns
t
ASL = PWASH –70 ns(2)
Multiplexed address hold time
AHL = 1/8 tCYC–29.5 ns(2) (3)b
tAHL
95.5
t
Delay time, E to AS rise, tASD = 1/8 tCYC–9.5 ns(2) (3)a
Pulse width, AS high, PWASH = 1/4 tCYC–29 ns(2)
Delay time, AS to E rise, tASED = 1/8 tCYC–9.5 ns(2) (3)b
tASD
PWASH
tASED
26
27
28
115.5
221
—
—
—
53
96
53
—
—
—
31
63
31
—
—
—
ns
ns
ns
115.5
MPU address access time(3)a
tACCA = tCYC–(PWEL–tAVM) –tDSR–tf
tACCA
tACCE
tMAD
29
35
36
744.5
—
—
442
—
307
—
—
192
—
196
—
111
—
ns
ns
ns
MPU access time, tACCE = PWEH –tDSR
Multiplexed address delay (Previous cycle MPU read)
tMAD = tASD + 30 ns(2) (3)a
145.5
83
51
1. VDD = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. Formula only for dc to 2 MHz
3. Input clocks with duty cycles other than 50% affect bus performance. Timing parameters affected by input clock duty cycle
are identified by (a) and (b). To recalculate the approximate bus timing values, substitute the following expressions in place
of 1/8 tCYCin the above formulas, where applicable:
(a) (1–dc) × 1/4 tCYC
(b) dc × 1/4 tCYC
Where:
dc is the decimal value of duty cycle percentage (high time)
Data Sheet
184
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
MC68L11E9/E20 Expansion Bus Timing Characteristics
10.16 MC68L11E9/E20 Expansion Bus Timing Characteristics
1.0 MHz
2.0 MHz
Characteristic(1)
Num
Symbol
Unit
Min
Max
1.0
—
Min
Max
2.0
—
fo
tCYC
PWEL
PWEH
tr
Frequency of operation (E-clock frequency)
Cycle time
dc
1000
475
470
—
dc
500
225
220
—
MHz
ns
1
2
3
Pulse width, E low, PWEL = 1/2 tCYC–25 ns
Pulse width, E high, PWEH = 1/2 tCYC–30 ns
—
—
ns
—
—
ns
4a E and AS rise time
4b E and AS fall time
25
25
ns
tf
—
25
—
25
ns
Address hold time(2) (2)a, tAH = 1/8 tCYC–30 ns
9
tAH
95
—
—
33
—
—
ns
Non-multiplexed address valid time to E rise
tAV
12
275
88
ns
tAV = PWEL –(tASD + 80 ns)(2)a
tDSR
tDHR
tDDW
17 Read data setup time
30
0
—
30
0
—
88
ns
ns
ns
Read data hold time , max = tMAD
18
19
21
150
195
Write data delay time, tDDW = 1/8 tCYC+ 70 ns(2)a
Write data hold time, tDHW = 1/8 tCYC–30 ns(2)a
—
—
133
tDHW
tAVM
95
—
—
33
78
—
—
ns
ns
Multiplexed address valid time to E rise
tAVM = PWEL –(tASD + 90 ns)(2)a
22
24
268
Multiplexed address valid time to AS fall
tASL = PWASH –70 ns
tASL
150
—
25
—
ns
Multiplexed address hold time, tAHL = 1/8 tCYC–30 ns(2)b
tAHL
tASD
25
26
27
28
95
—
—
—
—
33
58
95
58
—
—
—
—
ns
ns
ns
ns
Delay time, E to AS rise, tASD = 1/8 tCYC–5 ns(2)a
Pulse width, AS high, PWASH = 1/4 tCYC–30 ns
120
220
120
PWASH
tASED
Delay time, AS to E rise, tASED = 1/8 tCYC–5 ns(2)b
MPU address access time(3)a
tACCA = tCYC–(PWEL–tAVM) –tDSR–tf
tACCA
tACCE
tMAD
29
35
36
735
—
—
440
—
298
—
—
190
—
ns
ns
ns
MPU access time, tACCE = PWEH –tDSR
Multiplexed address delay (Previous cycle MPU read)
tMAD = tASD + 30 ns(2)a
150
88
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. Input clocks with duty cycles other than 50% affect bus performance. Timing parameters affected by input clock duty cycle
are identified by (a) and (b). To recalculate the approximate bus timing values, substitute the following expressions in place
of 1/8 tCYCin the above formulas, where applicable:
(a) (1–dc) × 1/4 tCYC
(b) dc × 1/4 tCYC
Where:
dc is the decimal value of duty cycle percentage (high time).
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
185
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
1
2
3
4B
E
4A
12
9
R/W, ADDRESS
NON-MULTIPLEXED
22
17
35
36
18
29
READ
ADDRESS
DATA
DATA
ADDRESS/DATA
MULTIPLEXED
1
9
21
W
R
I
E
A
D
D
R
E
S
S
DATA
25
4A
24
4B
AS
28
26
27
Note: Measurement points shown are 20% and 70% of VDD
.
Figure 10-14. Multiplexed Expansion Bus Timing Diagram
Data Sheet
186
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
Serial Peripheral Interface Timing Characteristics
10.17 Serial Peripheral Interface Timing Characteristics
E9
E20
Characteristic(1)
Num
Symbol
Unit
Min
dc
Max
3.0
—
Min
dc
Max
3.0
—
Frequency of operation
E clock
fo
MHz
ns
tCYC
E-clock period
333
333
Operating frequency
Master
Slave
fop(m)
fop(s)
fo/2
fo
fo/2
fo
fo/32
dc
fo/128
dc
MHz
tCYC
Cycle time
Master
Slave
tCYC(m)
tCYC(s)
1
2
1
32
—
2
1
128
—
Enable lead time(2)
Slave
tlead(s)
tCYC
2
3
1
1
—
—
1
1
—
—
Enable lag time(2)
Slave
tlag(s)
tCYC
Clock (SCK) high time
Master
Slave
tw(SCKH)m
tw(SCKH)s
tCYC–25
tCYC–25
16 tCYC
—
64 tCYC
—
4
5
6
7
ns
ns
ns
ns
1/2 tCYC–25
1/2 tCYC–25
Clock (SCK) low time
Master
Slave
tw(SCKL)m
tw(SCKL)s
tCYC–25
tCYC–25
16 tCYC
—
64 tCYC
—
1/2 tCYC–25
1/2 tCYC–25
Data setup time (inputs)
Master
Slave
tsu(m)
tsu(s)
30
30
—
—
30
30
—
—
Data hold time (inputs)
Master
Slave
th(m)
th(s)
30
30
—
—
30
30
—
—
Slave access time
CPHA = 0
CPHA = 1
ta
8
9
0
0
40
40
0
0
40
40
ns
ns
Disable time (hold time
to high-impedance state)
Slave
tdis
—
50
—
50
Data valid(3) (after enable edge)
tv
10
11
—
0
50
—
—
0
50
—
ns
ns
Data hold time (outputs)
(after enable edge)
tho
1. VDD = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. Time to data active from high-impedance state
3. Assumes 200 pF load on SCK, MOSI, and MISO pins
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
187
Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
Electrical Characteristics
10.18 MC68L11E9/E20 Serial Peirpheral Interface Characteristics
E9
E20
Characteristic(1)
Num
Symbol
Unit
Min
dc
Max
2.0
—
Min
dc
Max
2.0
—
Frequency of operation
E clock
fo
MHz
ns
tCYC
E-clock period
500
500
Operating frequency
Master
Slave
fop(m)
fop(s)
fo/2
fo
fo/2
fo
fo/32
dc
fo/128
dc
MHz
tCYC
Cycle time
Master
Slave
tCYC(m)
tCYC(s)
1
2
1
32
—
2
1
128
—
Enable lead time(2)
Slave
tlead(s)
tCYC
2
3
1
1
—
—
1
1
—
—
Enable lag time(2)
Slave
tlag(s)
tCYC
Clock (SCK) high time
Master
Slave
tw(SCKH)m
tw(SCKH)s
tCYC–30
tCYC–30
16 tCYC
—
64 tCYC
—
4
5
6
7
ns
ns
ns
ns
1/2 tCYC–30
1/2 tCYC–30
Clock (SCK) low time
Master
Slave
tw(SCKL)m
tw(SCKL)s
tCYC–30
tCYC–30
16 tCYC
—
64 tCYC
—
1/2 tCYC–30
1/2 tCYC–30
Data setup time (inputs)
Master
Slave
tsu(m)
tsu(s)
40
40
—
—
40
40
—
—
Data hold time (inputs)
Master
Slave
th(m)
th(s)
40
40
—
—
40
40
—
—
Slave access time
CPHA = 0
CPHA = 1
ta
8
9
0
0
50
50
0
0
50
50
ns
ns
Disable time (hold time
to high-impedance state)
Slave
tdis
—
60
—
60
Data valid(3) (after enable edge)
tv
10
11
—
0
60
—
—
0
60
—
ns
ns
Data hold time (outputs)
(after enable edge)
tho
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, all timing is shown with respect to 20% VDD and 70% VDD, unless
otherwise noted
2. Time to data active from high-impedance state
3. Assumes 100 pF load on SCK, MOSI, and MISO pins
Data Sheet
188
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
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Electrical Characteristics
MC68L11E9/E20 Serial Peirpheral Interface Characteristics
SS
INPUT
SS IS HELD HIGH ON MASTER.
1
SCK
CPOL = 0
INPUT
5
4
SEE NOTE
SEE NOTE
4
5
SCK
CPOL = 1
OUTPUT
6
7
MISO
INPUT
BIT 6 . . . 1
11
MSB IN
LSB IN
11 (REF)
10
MOSI
OUTPUT
BIT 6 . . . 1
MASTER MSB OUT
MASTER LSB OUT
Note: This first clock edge is generated internally but is not seen at the SCK pin.
A) SPI Master Timing (CPHA = 0)
SS
SS IS HELD HIGH ON MASTER.
INPUT
1
SCK
CPOL = 0
INPUT
5
SEE NOTE
4
5
SCK
CPOL = 1
OUTPUT
SEE NOTE
7
4
6
MISO
INPUT
BIT 6 . . . 1
11
MSB IN
LSB IN
11 (REF)
10
10 (REF)
MOSI
OUTPUT
BIT 6 . . . 1
MASTER MSB OUT
MASTER LSB OUT
Note: This first clock edge is generated internally but is not seen at the SCK pin.
B) SPI Master Timing (CPHA = 1)
Figure 10-15. SPI Timing Diagram (Sheet 1 of 2)
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
189
Electrical Characteristics
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Freescale Semiconductor, Inc.
Electrical Characteristics
SS
INPUT
1
3
SCK
CPOL = 0
INPUT
5
4
5
2
SCK
CPOL = 1
INPUT
8
4
9
MISO
OUTPUT
SEE
NOTE
BIT 6 . . . 1
SLAVE LSB OUT
MSB OUT
7
SLAVE
6
10
11
11
MOSI
INPUT
BIT 6 . . . 1
MSB IN
LSB IN
Note: Not defined but normally MSB of character just received
A) SPI Slave Timing (CPHA = 0)
SS
INPUT
1
3
SCK
CPOL = 0
INPUT
5
4
5
2
SCK
CPOL = 1
INPUT
8
10
SLAVE
6
4
MSB OUT
7
9
MISO
OUTPUT
SEE
NOTE
BIT 6 . . . 1
10
SLAVE LSB OUT
11
MOSI
INPUT
BIT 6 . . . 1
MSB IN
LSB IN
Note: Not defined but normally LSB of character previously transmitted
B) SPI Slave Timing (CPHA = 1)
Figure 11-15. SPI Timing Diagram (Sheet 2 of 2)
Data Sheet
190
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
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Freescale Semiconductor, Inc.
Electrical Characteristics
EEPROM Characteristics
10.19 EEPROM Characteristics
Temperature Range
Characteristic(1)
Unit
–40 to 85°C
–40 to 105°C
–40 to 125°C
Programming time(2)
< 1.0 MHz, RCO enabled
1.0 to 2.0 MHz, RCO disabled
≥ 2.0 MHz (or anytime RCO enabled)
10
20
10
15
Must use RCO
15
20
ms
Must use RCO
20
Erase time(2)
Byte, row, and bulk
10
10
10
ms
Write/erase endurance
10,000
10
10,000
10
10,000
10
Cycles
Years
Data retention
1. VDD = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = TL to TH
2. The RC oscillator (RCO) must be enabled (by setting the CSEL bit in the OPTION register) for EEPROM programming and
erasure when the E-clock frequency is below 1.0 MHz.
10.20 MC68L11E9/E20 EEPROM Characteristics
Temperature Range
Characteristic(1)
Unit
–20 to 70°C
Programming time(2)
3 V, E ≤ 2.0 MHz, RCO enabled
5 V, E ≤ 2.0 MHz, RCO enabled
25
10
ms
ms
Erase time(2) (byte, row, and bulk)
3 V, E ≤ 2.0 MHz, RCO enabled
5 V, E ≤ 2.0 MHz, RCO enabled
25
10
Write/erase endurance
10,000
10
Cycles
Years
Data retention
1. VDD = 3.0 Vdc to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH
2. The RC oscillator (RCO) must be enabled (by setting the CSEL bit in the OPTION register) for EEPROM programming and
erasure.
10.21 EPROM Characteristics
Characteristics(1)
Programming voltage(2)
Symbol
Min
11.75
—
Typ
12.25
3
Max
12.75
10
Unit
V
VPPE
Programming current(3)
Programming time
IPPE
mA
ms
tEPROG
2
2
4
1. VDD = 5.0 Vdc ± 10%
2. During EPROM programming of the MC68HC711E9 device, the VPPE pin circuitry may latch-up and be damaged if the
input current is not limited to 10 mA. For more information please refer to MC68HC711E9 8-Bit Microcontroller Unit Mask
Set Errata 3 (Motorola document order number 68HC711E9MSE3.
3. Typically, a 1-kΩ series resistor is sufficient to limit the programming current for the MC68HC711E9. A 100-Ω series
resistor is sufficient to limit the programming current for the MC68HC711E20.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
191
Electrical Characteristics
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Freescale Semiconductor, Inc.
Electrical Characteristics
Data Sheet
192
M68HC11E Family — Rev. 5
MOTOROLA
Electrical Characteristics
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Freescale Semiconductor, Inc.
Data Sheet — M68HC11E Family
Section 11. Ordering Information and Mechanical Specifications
11.1 Introduction
This section provides ordering information for the E-series devices grouped by:
•
•
•
Standard devices
Custom ROM devices
Extended voltage devices
In addition, mechanical specifications for the following packaging options:
•
•
•
•
•
•
52-pin plastic-leaded chip carrier (PLCC)
52-pin windowed ceramic-leaded chip carrier (CLCC)
64-pin quad flat pack (QFP)
52-pin thin quad flat pack (TQFP)
56-pin shrink dual in-line package with .070-inch lead spacing (SDIP)
48-pin plastic DIP (.100-inch lead spacing), MC68HC811E2 only
11.2 Standard Device Ordering Information
Description
CONFIG
Temperature
Frequency
MC Order Number
52-pin plastic leaded chip carrier (PLCC)
2 MHz
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC11E9BCFN2
MC68HC11E9BCFN3
MC68HC11E1CFN2
MC68HC11E1CFN3
MC68HC11E1VFN2
MC68HC11E1MFN2
MC68HC11E0CFN2
MC68HC11E0CFN3
MC68HC11E0VFN2
MC68HC11E0MFN2
BUFFALO ROM
No ROM
$0F
$0D
–40°C to +85°C
–40°C to +85°C
–40°C to +105°C
–40°C to +125°C
–40°C to +85°C
No ROM, no EEPROM
$0C
–40°C to +105°C
–40°C to +125°C
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
193
Ordering Information and Mechanical Specifications
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Freescale Semiconductor, Inc.
Ordering Information and Mechanical Specifications
Description
CONFIG
Temperature
Frequency
MC Order Number
52-pin plastic leaded chip carrier (PLCC) (Continued)
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC711E9CFN2
MC68HC711E9CFN3
MC68HC711E9VFN2
MC68HC711E9MFN2
–40°C to +85°C
OTPROM
$0F
$0F
–40°C to +105°C
–40°C to +125°C
OTPROM, enhanced security
feature
–40°C to +85°C
0°C to +70°C
2 MHz
MC68S711E9CFN2
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
2 MHz
2 MHz
2 MHz
2 MHz
MC68HC711E20FN3
MC68HC711E20CFN2
MC68HC711E20CFN3
MC68HC711E20VFN2
MC68HC711E20MFN2
MC68HC811E2FN2
–40°C to +85°C
20 Kbytes OTPROM
$0F
$FF
–40°C to +105°C
–40°C to +125°C
0°C to +70°C
–40°C to +85°C
–40°C to +105°C
–40°C to +125°C
MC68HC811E2CFN2
MC68HC811E2VFN2
MC68HC811E2MFN2
No ROM, 2 Kbytes EEPROM
64-pin quad flat pack (QFP)
2 MHz
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
2 MHz
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC11E9BCFU2
MC68HC11E9BCFU3
MC68HC11E1CFU2
MC68HC11E1CFU3
MC68HC11E1VFU2
MC68HC11E0CFU2
MC68HC11E0VFU2
MC68HC711E20FU3
MC68HC711E20CFU2
MC68HC711E20CFU3
MC68HC711E20VFU2
MC68HC711E20MFU2
BUFFALO ROM
$0F
$0D
$0C
–40°C to +85°C
–40°C to +85°C
No ROM
–40°C to +105°C
–40°C to +85°C
–40°C to +105°C
0°C to +70°°C
No ROM, no EEPROM
–40°C to +85°C
20 Kbytes OTPROM
$0F
$0F
–40°C to +105°C
–40°C to +125°C
52-pin thin quad flat pack (TQFP)
2 MHz
3 MHz
MC68HC11E9BCPB2
MC68HC11E9BCPB3
BUFFALO ROM
–40°C to +85°C
Data Sheet
194
M68HC11E Family — Rev. 5
MOTOROLA
Ordering Information and Mechanical Specifications
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Freescale Semiconductor, Inc.
Ordering Information and Mechanical Specifications
Standard Device Ordering Information
Description
CONFIG
Temperature
Frequency
MC Order Number
52-pin windowed ceramic leaded chip carrier (CLCC)
2 MHz
3 MHz
2 MHz
2 MHz
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC711E9CFS2
MC68HC711E9CFS3
MC68HC711E9VFS2
MC68HC711E9VFS2
MC68HC711E20FS3
MC68HC711E20CFS2
MC68HC711E20CFS3
MC68HC711E20VFS2
MC68HC711E20MFS2
–40°C to +85°C
EPROM
$0F
$0F
–40°C to +105°C
–40°C to +125°C
0°C o +70°°C
–40°C to +85°C
20 Kbytes EPROM
–40°C to +105°C
–40°C to +125°C
48-pin dual in-line package (DIP) — MC68HC811E2 only
0°C to +70°°C
2 MHz
2 MHz
2 MHz
2 MHz
MC68HC811E2P2
MC68HC811E2CP2
MC68HC811E2VP2
MC68HC811E2MP2
–40°C to +85°C
–40°C to +105°C
–40°C to +125°C
No ROM, 2 Kbytes EEPROM
$FF
56-pin dual in-line package with 0.70-inch lead spacing (SDIP)
2 MHz
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC11E9BCB2
MC68HC11E9BCB3
MC68HC11E1CB2
MC68HC11E1CB3
MC68HC11E1VB2
MC68HC11E1MB2
MC68HC11E0CB2
MC68HC11E0CB3
MC68HC11E0VB2
MC68HC11E0MB2
BUFFALO ROM
$0F
–40°C to +85°C
–40°C to +85°C
No ROM
$0D
–40°C to +105°C
–40°C to +125°C
–40°C to +85°C
No ROM, no EEPROM
$0C
–40°C to +105°C
–40°C to +125°C
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
195
Ordering Information and Mechanical Specifications
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Freescale Semiconductor, Inc.
Ordering Information and Mechanical Specifications
11.3 Custom ROM Device Ordering Information
Description
Temperature
Frequency
MC Order Number
52-pin plastic leaded chip carrier (PLCC)
0°C to +70°°C
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC11E9FN3
MC68HC11E9CFN2
MC68HC11E9CFN3
MC68HC11E9VFN2
MC68HC11E9MFN2
MC68HC11E20FN3
MC68HC11E20CFN2
MC68HC11E20CFN3
MC68HC11E20VFN2
MC68HC11E20MFN2
–40°C to +85°C
Custom ROM
–40°C to +105°C
–40°C to +125°C
0°C to +70°°C
–40°C to +85°C
20 Kbytes custom ROM
64-pin quad flat pack (QFP)
Custom ROM
–40°C to +105°C
–40°C to +125°C
0°C to +70°°C
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC11E9FU3
MC68HC11E9CFU2
MC68HC11E9CFU3
MC68HC11E9VFU2
MC68HC11E9MFU2
–40°C to +85°C
–40°C to +105°C
–40°C to +125°C
64-pin quad flat pack (continued)
20 Kbytes Custom ROM
0°C to +70°°C
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC11E20FU3
MC68HC11E20CFU2
MC68HC11E20CFU3
MC68HC11E20VFU2
MC68HC11E20MFU2
–40°C to +85°C
–40°C to +105°C
–40°C to +125°C
52-pin thin quad flat pack (10 mm x 10 mm)
0°C to +70°°C
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC11E9PB3
MC68HC11E9CPB2
MC68HC11E9CPB3
MC68HC11E9VPB2
MC68HC11E9MPB2
–40°C to +85°C
Custom ROM
–40°C to +105°C
–40°C to +125°C
56-pin dual in-line package with 0.70-inch lead spacing (SDIP)
0°C to +70°°C
3 MHz
2 MHz
3 MHz
2 MHz
2 MHz
MC68HC11E9B3
MC68HC11E9CB2
MC68HC11E9CB3
MC68HC11E9VB2
MC68HC11E9MB2
–40°C to +85°C
Custom ROM
–40°C to +105°C
–40°C to +125°C
Data Sheet
M68HC11E Family — Rev. 5
MOTOROLA
196
Ordering Information and Mechanical Specifications
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Ordering Information and Mechanical Specifications
Extended Voltage Device Ordering Information (3.0 Vdc to 5.5 Vdc)
11.4 Extended Voltage Device Ordering Information (3.0 Vdc to 5.5 Vdc)
Description
Temperature
Frequency
MC Order Number
52-pin plastic leaded chip carrier (PLCC)
MC68L11E9FN2
MC68L11E20FN2
Custom ROM
2 MHz
–20°C to +70°C
No ROM
2 MHz
2 MHz
MC68L11E1FN2
MC68L11E0FN2
No ROM, no EEPROM
64-pin quad flat pack (QFP)
MC68L11E9FU2
MC68L11E20FU2
Custom ROM
2 MHz
–20°C to +70°C
–20°C to +70°C
No ROM
2 MHz
2 MHz
MC68L11E1FU2
MC68L11E0FU2
No ROM, no EEPROM
52-pin thin quad flat pack (10 mm x 10 mm)
Custom ROM
2 MHz
2 MHz
2 MHz
MC68L11E9PB2
MC68L11E1PB2
MC68L11E0PB2
No ROM
No ROM, no EEPROM
56-pin dual in-line package with 0.70-inch lead spacing (SDIP)
Custom ROM
2 MHz
2 MHz
2 MHz
MC68L11E9B2
MC68L11E1B2
MC68L11E0B2
No ROM
–20°C to +70°C
No ROM, no EEPROM
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
197
Ordering Information and Mechanical Specifications
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Ordering Information and Mechanical Specifications
11.5 52-Pin Plastic-Leaded Chip Carrier (Case 778)
M
S
S
0.007 (0.18)
T
L–M
N
B
Y BRK
–N–
M
S
S
0.007 (0.18)
T
L–M
N
U
D
Z
–M–
–L–
W
D
G1
52
1
X
S
S
S
0.010 (0.25)
T
L–M
N
V
VIEW D–D
NOTES:
M
M
S
S
1. DATUMS –L–, –M–, AND –N– DETERMINED WHERE
TOP OF LEAD SHOULDER EXITS PLASTIC BODY AT
MOLD PARTING LINE.
2. DIMENSION G1, TRUE POSITION TO BE MEASURED
AT DATUM –T–, SEATING PLANE.
0.007 (0.18)
0.007 (0.18)
T
T
L–M
L–M
N
A
R
Z
S
S
N
3. DIMENSIONS R AND U DO NOT INCLUDE MOLD
FLASH. ALLOWABLE MOLD FLASH IS 0.010 (0.250)
PER SIDE.
4. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
5. CONTROLLING DIMENSION: INCH.
E
C
0.004 (0.100)
6. THE PACKAGE TOP MAY BE SMALLER THAN THE
PACKAGE BOTTOM BY UP TO 0.012 (0.300).
DIMENSIONS R AND U ARE DETERMINED AT THE
OUTERMOST EXTREMES OF THE PLASTIC BODY
EXCLUSIVE OF MOLD FLASH, TIE BAR BURRS, GATE
BURRS AND INTERLEAD FLASH, BUT INCLUDING
ANY MISMATCH BETWEEN THE TOP AND BOTTOM
OF THE PLASTIC BODY.
–T– SEATING
J
G
PLANE
VIEW S
G1
S
S
S
0.010 (0.25)
T
L–M
N
7. DIMENSION H DOES NOT INCLUDE DAMBAR
PROTRUSION OR INTRUSION. THE DAMBAR
PROTRUSION(S) SHALL NOT CAUSE THE H
DIMENSION TO BE GREATER THAN 0.037 (0.940).
THE DAMBAR INTRUSION(S) SHALL NOT CAUSE THE
H DIMENSION TO BE SMALLER THAN 0.025 (0.635).
M
S
S
H
F
0.007 (0.18)
0.007 (0.18)
T
L–M
N
INCHES
MILLIMETERS
K1
K
DIM
A
B
C
E
MIN
MAX
0.795
0.795
0.180
0.110
0.019
MIN
19.94
19.94
4.20
2.29
0.33
MAX
20.19
20.19
4.57
2.79
0.48
0.785
0.785
0.165
0.090
0.013
M
S
S
T
L–M
N
F
G
H
J
K
R
U
V
W
X
Y
0.050 BSC
1.27 BSC
VIEW S
0.026
0.020
0.025
0.750
0.750
0.042
0.042
0.042
–––
0.032
–––
–––
0.756
0.756
0.048
0.048
0.056
0.020
10
0.66
0.51
0.64
19.05
19.05
1.07
1.07
1.07
–––
0.81
–––
–––
19.20
19.20
1.21
1.21
1.42
0.50
10
Z
2
2
G1
K1
0.710
0.040
0.730
–––
18.04
1.02
18.54
–––
Data Sheet
198
M68HC11E Family — Rev. 5
MOTOROLA
Ordering Information and Mechanical Specifications
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Freescale Semiconductor, Inc.
Ordering Information and Mechanical Specifications
52-Pin Windowed Ceramic-Leaded Chip Carrier (Case 778B)
11.6 52-Pin Windowed Ceramic-Leaded Chip Carrier (Case 778B)
NOTES:
-A-
R
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION R AND N DO NOT INCLUDE
GLASS PROTRUSION. GLASS PROTRUSION
TO BE 0.25 (0.010) MAXIMUM.
M
S
S
B
0.51 (0.020)
T A
4. ALL DIMENSIONS AND TOLERANCES
INCLUDE LEAD TRIM OFFSET AND LEAD
INCHES
DIM MIN MAX
MILLIMETERS
MIN
19.94
19.94
4.20
MAX
20.19
20.19
5.08
A
B
C
D
F
0.785
0.785
0.165
0.017
0.026
0.795
0.795
0.200
0.021
0.032
N
-B-
0.44
0.67
0.53
0.81
G
H
J
K
N
R
S
0.050 BSC
1.27 BSC
0.090
0.006
0.035
0.735
0.735
0.690
0.130
0.010
0.045
0.756
0.756
0.730
2.29
0.16
3.30
0.25
0.89
1.14
18.67
18.67
17.53
19.20
19.20
18.54
M
S
S
0.51 (0.020)
T A
B
F
K
H
0.15 (0.006)
C
G
-T- SEATING
PLANE
J
D 52 PL
M
S
S
B
0.18 (0.007)
T A
S
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
199
Ordering Information and Mechanical Specifications
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Ordering Information and Mechanical Specifications
11.7 64-Pin Quad Flat Pack (Case 840C)
B
B
L
–A–, –B–, –D–
33
48
32
49
P
B
L
V
DETAIL A
F
BASE
METAL
DETAIL A
J
N
17
64
D
16
1
M
S
S
D
0.20 (0.008)
C A–B
–D–
SECTION B–B
A
NOTES:
M
S
S
S
0.20 (0.008)
H A–B
D
D
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DATUM PLANE –H– IS LOCATED AT BOTTOM OF
LEAD AND IS COINCIDENT WITH THE LEAD
WHERE THE LEAD EXITS THE PLASTIC BODY AT
THE BOTTOM OF THE PARTING LINE.
0.05 (0.002) A–B
S
M
S
C A–B
0.20 (0.008)
4. DATUMS A–B AND –D– TO BE DETERMINED AT
DATUM PLANE –H–.
5. DIMENSIONS S AND V TO BE DETERMINED AT
SEATING PLANE –C–.
6. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS 0.25
(0.010) PER SIDE. DIMENSIONS A AND B DO
INCLUDE MOLD MISMATCH AND ARE
–H–
DATUM PLANE
C
E
H
DETERMINED AT DATUM PLANE –H–.
7. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. DAMBAR PROTRUSION SHALL
NOT CAUSE THE D DIMENSION TO EXCEED 0.53
(0.021). DAMBAR CANNOT BE LOCATED ON THE
LOWER RADIUS OR THE FOOT.
0.10 (0.004)
SEATING PLANE
–C–
G
DETAIL C
8. DIMENSION K IS TO BE MEASURED FROM THE
THEORETICAL INTERSECTION OF LEAD FOOT
AND LEG CENTERLINES.
U
MILLIMETERS
INCHES
M
DIM MIN
MAX
14.10
14.10
2.46
MIN
MAX
0.555
0.555
0.097
0.018
0.094
–––
T
A
B
C
D
E
F
13.90
13.90
2.07
0.30
2.00
0.30
0.547
0.547
0.081
0.012
0.079
0.45
2.40
R
––– 0.012
G
H
J
K
L
M
N
P
Q
R
S
T
0.80 BSC
0.031 BSC
0.067
0.130
0.50
0.250
0.230
0.66
0.003
0.005
0.020
0.010
0.090
0.026
Q
12.00 REF
0.472 REF
SEATING PLANE
5
0.130
10
0.170
5
0.005
10
0.007
K
0.40 BSC
0.016 BSC
2
2
0.13
16.20
8
0.30
16.60
8
0.005
0.638
0.012
0.654
X
M
0.20 REF
0.008 REF
U
V
X
0
16.20
1.10
–––
16.60
1.30
0
–––
0.654
0.051
0.638
0.043
DETAIL C
Data Sheet
200
M68HC11E Family — Rev. 5
MOTOROLA
Ordering Information and Mechanical Specifications
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Ordering Information and Mechanical Specifications
52-Pin Thin Quad Flat Pack (Case 848D)
11.8 52-Pin Thin Quad Flat Pack (Case 848D)
4X
4X TIPS
0.20 (0.008) H L–M
N
0.20 (0.008) T L–M N
–X–
X=L, M, N
52
40
C
1
39
L
AB
AB
G
3X VIEW Y
–L–
–M–
B1
B
V
VIEW Y
F
BASE METAL
PLATING
V1
13
27
J
U
14
26
–N–
D
A1
M
S
S
0.13 (0.005)
T
L–M
N
S1
SECTION AB–AB
A
ROTATED 90 CLOCKWISE
S
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DATUM PLANE –H– IS LOCATED AT BOTTOM OF
LEAD AND IS COINCIDENT WITH THE LEAD
WHERE THE LEAD EXITS THE PLASTIC BODY AT
THE BOTTOM OF THE PARTING LINE.
4. DATUMS –L–, –M– AND –N– TO BE DETERMINED
AT DATUM PLANE –H–.
4X θ2
4X θ3
C
0.10 (0.004)
T
–H–
5. DIMENSIONS S AND V TO BE DETERMINED AT
SEATING PLANE –T–.
–T–
SEATING
PLANE
6. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS
0.25 (0.010) PER SIDE. DIMENSIONS A AND B
DO INCLUDE MOLD MISMATCH AND ARE
DETERMINED AT DATUM PLANE -H-.
VIEW AA
7. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. DAMBAR PROTRUSION SHALL
NOT CAUSE THE LEAD WIDTH TO EXCEED 0.46
(0.018). MINIMUM SPACE BETWEEN
PROTRUSION AND ADJACENT LEAD OR
PROTRUSION 0.07 (0.003).
S
0.05 (0.002)
MILLIMETERS
DIM MIN MAX
10.00 BSC
INCHES
MIN MAX
0.394 BSC
0.197 BSC
0.394 BSC
0.197 BSC
W
2 X R R1
θ1
A
A1
B
5.00 BSC
10.00 BSC
5.00 BSC
0.25 (0.010)
C2
B1
C
θ
–––
0.05
1.30
0.20
0.45
0.22
1.70
–––
0.002
0.051
0.008
0.018
0.009
0.067
GAGE PLANE
C1
C2
D
E
F
0.20
1.50
0.40
0.75
0.35
0.008
0.059
0.016
0.030
0.014
K
E
C1
G
J
0.65 BSC
0.026 BSC
0.07
0.20
0.003
0.008
Z
K
R1
S
S1
U
0.50 REF
0.020 REF
0.08
0.20
0.003
0.008
VIEW AA
12.00 BSC
6.00 BSC
0.09 0.16
0.472 BSC
0.236 BSC
0.004 0.006
V
12.00 BSC
6.00 BSC
0.20 REF
1.00 REF
0.472 BSC
0.236 BSC
0.008 REF
0.039 REF
V1
W
Z
θ
0
0
12
7
–––
0
0
12
7
–––
θ1
θ2
θ3
REF
13
REF
13
5
5
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
201
Ordering Information and Mechanical Specifications
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Ordering Information and Mechanical Specifications
11.9 56-Pin Dual in-Line Package (Case 859)
–A–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
56
29
28
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSIONS A AND B DO NOT INCLUDE MOLD
FLASH. MAXIMUM MOLD FLASH 0.25 (0.010)
–B–
INCHES
DIM MIN MAX
MILLIMETERS
1
MIN
51.69
13.72
3.94
MAX
52.45
14.22
5.08
A
B
C
D
E
F
2.035
0.540
0.155
0.014
2.065
0.560
0.200
0.022
L
0.36
0.56
H
C
0.035 BSC
0.89 BSC
0.032
0.046
0.81
1.17
G
H
J
K
L
0.070 BSC
0.300 BSC
1.778 BSC
7.62 BSC
–T–
SEATING
PLANE
K
0.008
0.115
0.015
0.135
0.20
2.92
0.38
3.43
0.600 BSC
15.24 BSC
N
G
M
F
M
N
0
0.020
15
0.040
0
0.51
15
1.02
E
J 56 PL
D 56 PL
0.25 (0.010)
M
S
T A
M
S
T B
0.25 (0.010)
11.10 48-Pin Plastic DIP (Case 767)
NOTE:
The MC68HC811E2 is the only member of the E series that is offered in a 48-pin
plastic dual in-line package.
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
-A-
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN FORMED
PARALLEL.
48
1
25
4. DIMENSIONSAANDBDONOTINCLUDEMOLDFLASH.
MAXIMUM MOLD FLASH 0.25 (0.010).
-B-
TIP TAPER
INCHES
DIM MIN MAX
MILLIMETERS
MIN
61.34
13.72
3.94
MAX
62.10
14.22
5.08
24
A
B
C
D
F
2.415
0.540
0.155
0.014
0.040
2.445
0.560
0.200
0.022
0.060
DETAIL X
L
0.36
1.02
0.55
1.52
C
G
H
J
K
L
0.100 BSC
0.070 BSC
2.54 BSC
1.79 BSC
0.008
0.115
0.015
0.150
0.20
2.92
0.38
3.81
0.600 BSC
15.24 BSC
15
0.51
-T-
SEATING
PLANE
K
M
N
0
0.020
15
×
0.040
0
×
×
×
1.01
M 48 PL
N
DETAIL X
G
F
J 48 PL
D 32 PL
M
S
T B
0.25 (0.010)
M
S
T A
0.51 (0.020)
Data Sheet
202
M68HC11E Family — Rev. 5
MOTOROLA
Ordering Information and Mechanical Specifications
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Data Sheet — M68HC11E Family
Appendix A. Development Support
A.1 Introduction
This section provides information on the development support offered for the
E-series devices.
A.2 Motorola M68HC11 E-Series Development Tools
SPGMR
Programming
Adapter(3)
Emulation
Module(1) (2)
Flex
Cable(1) (2)
MMDS11
Target Head(1) (2)
Device
Package
52 FN
52 PB
56 B
M68EM11E20
M68EM11E20
M68EM11E20
M68EM11E20
M68EM11E20
M68EM11E20
M68EM11E20
M68EM11E20
M68CBL11C
M68CBL11C
M68CBL11B
M68CBL11C
M68CBL11C
M68CBL11C
M68CBL11B
M68CBL11C
M68TC11E20FN52
M68TC11E20PB52
M68TC11E20B56
M68TC11E20FU64
M68TC11E20FN52
M68TC11E20FU64
M68TB11E20P48
M68TC11E20FN52
M68PA11E20FN52
M68PA11E20PB52
M68PA11E20B56
M68PA11E20FU64
M68PA11E20FN52
M68PA11E20FU64
M68PA11A8P48
MC68HC11E9
MC68HC711E9
64 FU
52 FN
64 FU
48 P
MC68HC11E20
MC68HC711E20
MC68HC811E2
52 FN
M68PA11E20FN52
1. Each MMDS11 system consists of a system console (M68MMDS11), an emulation module, a flex cable, and a target head.
2. A complete EVS consists of a platform board (M68HC11PFB), an emulation module, a flex cable, and a target head.
3. Each SPGMR system consists of a universal serial programmer (M68SPGMR11) and a programming adapter. It can be
used alone or in conjunction with the MMDS11.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
203
Development Support
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Development Support
A.3 EVS — Evaluation System
The EVS is an economical tool for designing, debugging, and evaluating target
systems based on the M68HC11. EVS features include:
•
•
•
•
Monitor/debugger firmware
One-line assembler/disassembler
Host computer download capability
Dual memory maps:
–
–
64-Kbyte monitor map that includes 16 Kbytes of monitor EPROM
M68HC11 E-series user map that includes 64 Kbytes of emulation RAM
•
MCU extension input/output (I/O) port for single-chip, expanded, and
special-test operation modes
•
•
RS-232C terminal and host I/O ports
Logic analyzer connector
A.4 Motorola Modular Development System (MMDS11)
The M68MMDS11 Motorola modular development system (MMDS11) is an
emulator system for developing embedded systems based on an M68HC11
microcontroller unit (MCU). The MMDS11 provides a bus state analyzer (BSA) and
real-time memory windows. The unit's integrated development environment
includes an editor, an assembler, user interface, and source-level debug. These
features significantly reduce the time necessary to develop and debug an
embedded MCU system. The unit's compact size requires a minimum of desk
space.
The MMDS11 is one component of Motorola's modular approach to MCU-based
product development. This modular approach allows easy configuration of the
MMDS11 to fit a wide range of requirements. It also reduces development system
cost by allowing the user to purchase only the modular components necessary to
support the particular MCU derivative.
MMDS11 features include:
•
Real-time, non-intrusive, in-circuit emulation at the MCU’s operating
frequency
•
Real-time bus state analyzer
–
–
8 K x 64 real-time trace buffer
Display of real-time trace data as raw data, disassembled instructions,
raw data and disassembled instructions, or assembly-language source
code
–
–
–
Four hardware triggers for commencing trace and to provide breakpoints
Nine triggering modes
As many as 8190 pre- or post-trigger points for trace data
Data Sheet
204
M68HC11E Family — Rev. 5
Development Support
MOTOROLA
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Development Support
–
–
16 general-purpose logic clips, four of which can be used to trigger the
bus state analyzer sequencer
16-bit time tag or an optional 24-bit time tag that reduces the logic clips
traced from 16 to eight
•
•
Four data breakpoints (hardware breakpoints)
Hardware instruction breakpoints over either the 64-Kbyte M68HC11
memory map or over a 1-Mbyte bank switched memory map
•
•
32 real-time variables, nine of which can be displayed in the variables
window. These variables may be read or written while the MCU is running
32 bytes of real-time memory can be displayed in the memory window. This
memory may be read or written while the MCU is running
•
•
•
64 Kbytes of fast emulation memory (SRAM)
Current-limited target input/output connections
Six software-selectable oscillator clock sources: five internally generated
frequencies and an external frequency via a bus analyzer logic clip
•
•
•
•
•
Command and response logging to MS-DOS® disk files to save session
history
SCRIPT command for automatic execution of a sequence of MMDS11
commands
Assembly or C-language source-level debugging with global variable
viewing
Host/emulator communications speeds as high as 57,600 baud for quick
program loading
Extensive on-line MCU information via the CHIPINFO command. View
memory map, vectors, register, and pinout information pertaining to the
device being emulated
•
Host software supports:
–
–
–
–
–
An editor
An assembler and user interface
Source-level debug
Bus state analysis
IBM® mouse
® IBM is a registered trademark of International Business Machines Corporation.
® MS-DOS is a registered trademark of Microsoft Corporation.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
205
Development Support
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Development Support
A.5 SPGMR11 — Serial Programmer for M68HC11 MCUs
The SPGMR11 is a modular EPROM/EEPROM programming tool for all M68HC11
devices. The programmer features interchangeable adapters that allow
programming of various M68HC11 package types.
Programmer features include:
•
Programs M68HC11 Family devices that contain an EPROM or EEPROM
array.
•
Can be operated as a stand-alone programmer connected to a host
computer or connected between a host computer and the M68HC11
modular development system (MMDS11) station module
•
•
Uses plug-in programming adapters to accommodate a variety of MCU
devices and packages
On-board programming voltage circuit eliminates the need for an external
12-volt supply.
•
•
Includes programming software and a user’s manual
Includes a +5-volt power cable and a DB9 to DB25 connector adapter
Data Sheet
206
M68HC11E Family — Rev. 5
Development Support
MOTOROLA
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Data Sheet — M68HC11E Family
Appendix B. EVBU Schematic
Refer to Figure B-1 for a schematic diagram of the M68HC11EVBU Universal
Evaluation Board. This diagram is included for reference only.
M68HC11E Family — Rev. 5
MOTOROLA
Data Sheet
207
EVBU Schematic
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EVBU Schematic
T E N 1 O
Data Sheet
208
M68HC11E Family — Rev. 5
MOTOROLA
EVBU Schematic
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Order this document
by AN1060/D
Rev. 1.0
Motorola Semiconductor Application Note
AN1060
M68HC11 Bootstrap Mode
By Jim Sibigtroth, Mike Rhoades, and John Langan
Austin, Texas
Introduction
The M68HC11 Family of MCUs (microcontroller units) has a bootstrap
mode that allows a user-defined program to be loaded into the internal
random-access memory (RAM) by way of the serial communications
interface (SCI); the M68HC11 then executes this loaded program. The
loaded program can do anything a normal user program can do as well
as anything a factory test program can do because protected control bits
are accessible in bootstrap mode. Although the bootstrap mode is a
single-chip mode of operation, expanded mode resources are
accessible because the mode control bits can be changed while
operating in the bootstrap mode.
This application note explains the operation and application of the
M68HC11 bootstrap mode. Although basic concepts associated with this
mode are quite simple, the more subtle implications of these functions
require careful consideration. Useful applications of this mode are
overlooked due to an incomplete understanding of bootstrap mode.
Also, common problems associated with bootstrap mode could be
avoided by a more complete understanding of its operation and
implications.
© Motorola, Inc., 1999
AN1060 — Rev. 1.0
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Application Note
Topics discussed in this application note include:
•
•
•
•
•
•
•
•
•
•
•
Basic operation of the M68HC11 bootstrap mode
General discussion of bootstrap mode uses
Detailed explanation of on-chip bootstrap logic
Detailed explanation of bootstrap firmware
Bootstrap firmware vs. EEPROM security
Incorporating the bootstrap mode into a system
Driving bootstrap mode from another M68HC11
Driving bootstrap mode from a personal computer
Common bootstrap mode problems
Variations for specific versions of M68HC11
Commented listings for selected M68HC11 bootstrap ROMs
Basic Bootstrap Mode
This section describes only basic functions of the bootstrap mode. Other
functions of the bootstrap mode are described in detail in the remainder
of this application note.
When an M68HC11 is reset in bootstrap mode, the reset vector is
fetched from a small internal read-only memory (ROM) called the
bootstrap ROM or boot ROM. The firmware program in this boot ROM
then controls the bootloading process, in this manner:
•
First, the on-chip SCI (serial communications interface) is
initialized. The first character received ($FF) determines which of
two possible baud rates should be used for the remaining
characters in the download operation.
•
•
Next, a binary program is received by the SCI system and is stored
in RAM.
Finally, a jump instruction is executed to pass control from the
bootloader firmware to the user’s loaded program.
AN1060 — Rev. 1.0
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210
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Application Note
Bootstrap mode is useful both at the component level and after the MCU
has been embedded into a finished user system.
At the component level, Motorola uses bootstrap mode to control a
monitored burn-in program for the on-chip electrically erasable
programmable read-only memory (EEPROM). Units to be tested are
loaded into special circuit boards that each hold many MCUS. These
boards are then placed in burn-in ovens. Driver boards outside the
ovens download an EEPROM exercise and diagnostic program to all
MCUs in parallel. The MCUs under test independently exercise their
internal EEPROM and monitor programming and erase operations. This
technique could be utilized by an end user to load program information
into the EPROM or EEPROM of an M68HC11 before it is installed into
an end product. As in the burn-in setup, many M68HC11s can be gang
programmed in parallel. This technique can also be used to program the
EPROM of finished products after final assembly.
Motorola also uses bootstrap mode for programming target devices on
the M68HC11 evaluation modules (EVM). Because bootstrap mode is a
privileged mode like special test, the EEPROM-based configuration
register (CONFIG) can be programmed using bootstrap mode on the
EVM.
The greatest benefits from bootstrap mode are realized by designing the
finished system so that bootstrap mode can be used after final
assembly. The finished system need not be a single-chip mode
application for the bootstrap mode to be useful because the expansion
bus can be enabled after resetting the MCU in bootstrap mode. Allowing
this capability requires almost no hardware or design cost and the
addition of this capability is invisible in the end product until it is needed.
The ability to control the embedded processor through downloaded
programs is achieved without the disassembly and chip-swapping
usually associated with such control. This mode provides an easy way
to load non-volatile memories such as EEPROM with calibration tables
or to program the application firmware into a one-time programmable
(OTP) MCU after final assembly.
Another powerful use of bootstrap mode in a finished assembly is for
final test. Short programs can be downloaded to check parts of the
AN1060 — Rev. 1.0
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211
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Application Note
system, including components and circuitry external to the embedded
MCU. If any problems appear during product development, diagnostic
programs can be downloaded to find the problems, and corrected
routines can be downloaded and checked before incorporating them into
the main application program.
Bootstrap mode can also be used to interactively calibrate critical analog
sensors. Since this calibration is done in the final assembled system, it
can compensate for any errors in discrete interface circuitry and cabling
between the sensor and the analog inputs to the MCU. Note that this
calibration routine is a downloaded program that does not take up space
in the normal application program.
Bootstrap Mode Logic
In the M68HC11 MCUs, very little logic is dedicated to the bootstrap
mode. Consequently, this mode adds almost no extra cost to the MCU
system. The biggest piece of circuitry for bootstrap mode is the small
boot ROM. This ROM is 192 bytes in the original MC68HC11A8, but
some of the newest members of the M68HC11 Family, such as the
MC68HC711K4, have as much as 448 bytes to accommodate added
features. Normally, this boot ROM is present in the memory map only
when the MCU is reset in bootstrap mode to prevent interference with
the user’s normal memory space. The enable for this ROM is controlled
by the read boot ROM (RBOOT) control bit in the highest priority
interrupt (HPRIO) register. The RBOOT bit can be written by software
whenever the MCU is in special test or special bootstrap modes; when
the MCU is in normal modes, RBOOT reverts to 0 and becomes a read-
only bit. All other logic in the MCU would be present whether or not there
was a bootstrap mode.
Figure 1 shows the composite memory map of the MC68HC711E9 in its
four basic modes of operation, including bootstrap mode. The active
mode is determined by the mode A (MDA) and special mode (SMOD)
control bits in the HPRIO control register. These control bits are in turn
controlled by the state of the mode A (MODA) and mode B (MODB) pins
during reset. Table 1 shows the relationship between the state of these
AN1060 — Rev. 1.0
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Application Note
pins during reset, the selected mode, and the state of the MDA, SMOD,
and RBOOT control bits. Refer to the composite memory map and
information in Table 1 for the following discussion.
The MDA control bit is determined by the state of the MODA pin as the
MCU leaves reset. MDA selects between single-chip and expanded
operating modes. When MDA is 0, a single-chip mode is selected, either
normal single-chip mode or special bootstrap mode. When MDA is 1, an
expanded mode is selected, either normal expanded mode or special
test mode.
The SMOD control bit is determined by the inverted state of the MODB
pin as the MCU leaves reset. SMOD controls whether a normal mode or
a special mode is selected. When SMOD is 0, one of the two normal
modes is selected, either normal single-chip mode or normal expanded
mode. When SMOD is 1, one of the two special modes is selected, either
special bootstrap mode or special test mode. When either special mode
is in effect (SMOD = 1), certain privileges are in effect, for instance, the
ability to write to the mode control bits and fetching the reset and
interrupt vectors from $BFxx rather than $FFxx.
Table 1. Mode Selection Summary
Input Pins
Control Bits in HPRIO
Mode Selected
MODB
MODA
RBOOT
SMOD
MDA
1
0
0
0
0
0
0
1
Normal single chip
Normal expanded
Special bootstrap
Special test
0
0
1
0
0
0
1
1
0
1
0
1
The alternate vector locations are achieved by simply driving address bit
A14 low during all vector fetches if SMOD = 1. For special test mode, the
alternate vector locations assure that the reset vector can be fetched
from external memory space so the test system can control MCU
operation. In special bootstrap mode, the small boot ROM is enabled in
the memory map by RBOOT = 1 so the reset vector will be fetched from
this ROM and the bootloader firmware will control MCU operation.
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RBOOT is reset to 1 in bootstrap mode to enable the small boot ROM.
In the other three modes, RBOOT is reset to 0 to keep the boot ROM out
of the memory map. While in special test mode, SMOD = 1, which allows
the RBOOT control bit to be written to 1 by software to enable the boot
ROM for testing purposes.
Boot ROM Firmware
The main program in the boot ROM is the bootloader, which is
automatically executed as a result of resetting the MCU in bootstrap
mode. Some newer versions of the M68HC11 Family have additional
utility programs that can be called from a downloaded program. One
utility is available to program EPROM or OTP versions of the M68HC11.
A second utility allows the contents of memory locations to be uploaded
to a host computer. In the MC68HC711K4 boot ROM, a section of code
is used by Motorola for stress testing the on-chip EEPROM. These test
and utility programs are similar to self-test ROM programs in other
MCUs except that the boot ROM does not use valuable space in the
normal memory map.
Bootstrap firmware is also involved in an optional EEPROM security
function on some versions of the M68HC11. This EEPROM security
feature prevents a software pirate from seeing what is in the on-chip
EEPROM. The secured state is invoked by programming the no security
(NOSEC) EEPROM bit in the CONFIG register. Once this NOSEC bit is
programmed to 0, the MCU will ignore the mode A pin and always come
out of reset in normal single-chip mode or special bootstrap mode,
depending on the state of the mode B pin. Normal single-chip mode is
the usual way a secured part would be used. Special bootstrap mode is
used to disengage the security function (only after the contents of
EEPROM and RAM have been erased). Refer to the M68HC11
Reference Manual, Motorola document order number M68HC11RM/AD,
for additional information on the security mode and complete listings of
the boot ROMs that support the EEPROM security functions.
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Automatic Selection of Baud Rate
The bootloader program in the MC68HC711E9 accommodates either of
two baud rates.
•
The higher of these baud rates (7812 baud at a 2-MHz E-clock
rate) is used in systems that operate from a binary frequency
crystal such as 2 Hz (8.389 MHz). At this crystal frequency, the
23
baud rate is 8192 baud, which was used extensively in automotive
applications.
•
The second baud rate available to the M68HC11 bootloader is
1200 baud at a 2-MHz E-clock rate. Some of the newest versions
of the M68HC11, including the MC68HC11F1 and
MC68HC117K4, accommodate other baud rates using the same
differentiation technique explained here. Refer to the reference
numbers in square brackets in Figure 2 during the following
explanation.
NOTE: Software can change some aspects of the memory map after reset.
Figure 2 shows how the bootloader program differentiates between the
default baud rate (7812 baud at a 2-MHz E-clock rate) and the alternate
baud rate (1200 baud at a 2-MHz E-clock rate). The host computer
sends an initial $FF character, which is used by the bootloader to
determine the baud rate that will be used for the downloading operation.
The top half of Figure 2 shows normal reception of $FF. Receive data
samples at [1] detect the falling edge of the start bit and then verify the
start bit by taking a sample at the center of the start bit time. Samples
are then taken at the middle of each bit time [2] to reconstruct the value
of the received character (all 1s in this case). A sample is then taken at
the middle of the stop bit time as a framing check (a 1 is expected) [3].
Unless another character immediately follows this $FF character, the
receive data line will idle in the high state as shown at [4].
The bottom half of Figure 2 shows how the receiver will incorrectly
receive the $FF character that is sent from the host at 1200 baud.
Because the receiver is set to 7812 baud, the receive data samples are
taken at the same times as in the upper half of Figure 2. The start bit at
1200 baud [5] is 6.5 times as long as the start bit at 7812 baud [6].
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$0000
$01FF
(MAY BE REMAPPED
TO ANY 4K BOUNDARY)
512-BYTE
RAM
EXTERNAL
EXTERNAL
$1000
$103F
(MAY BE REMAPPED
TO ANY 4K BOUNDARY)
64-BYTE
REGISTER
BLOCK
EXTERNAL
EXTERNAL
(MAY BE DISABLED
BY AN EEPROM BIT)
512-BYTE
EEPROM
$B600
$B7FF
$BFC0
BOOT
ROM
SPECIAL
MODE
VECTORS
EXTERNAL
EXTERNAL
$BF00
$BFC0
$BFFF
$BFFF
(MAY BE DISABLED
BY AN EEPROM BIT)
$D000
12K USER
EPROM
(or OTP)
$FFC0
NORMAL
MODE
VECTORS
$FFC0
$FFFF
SINGLE
CHIP
$FFFF
EXPANDED
MULTIPLEXED
SPECIAL
BOOTSTRAP
SPECIAL
TEST
MODA = 0
MODB = 1
MODA = 1
MODB = 1
MODA = 0
MODB = 0
MODA = 1
MODB = 0
NOTE: Software can change some aspects of the memory map after reset.
Figure 1. MC68HC711E9 Composite Memory Map
[4]
START BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 STOP Tx DATA LINE IDLES HIGH
[6]
$FF CHARACTER
@ 7812 BAUD
Rx DATA SAMPLES
[3]
S
0
1
1
1
1
1
1
1
1
1
[2]
[1]
$FF
[5]
$FF CHARACTER
@ 1200 BAUD
START
BIT 0
BIT 1
Rx DATA SAMPLES
( FOR 7812 BAUD )
[8]
0
[12]
[11]
S
0
[7]
0
0
0
0
?
1
1
1
[9]
$C0
or $E0 [10]
Figure 2. Automatic Detection of Baud Rate
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Samples taken at [7] detect the failing edge of the start bit and verify it is
a logic 0. Samples taken at the middle of what the receiver interprets as
the first five bit times [8] detect logic 0s. The sample taken at the middle
of what the receiver interprets as bit 5 [9] may detect either a 0 or a 1
because the receive data has a rising transition at about this time. The
samples for bits 6 and 7 detect 1s, causing the receiver to think the
received character was $C0 or $E0 [10] at 7812 baud instead of the $FF
which was sent at 1200 baud. The stop bit sample detects a 1 as
expected [11], but this detection is actually in the middle of bit 0 of the
1200 baud $FF character. The SCI receiver is not confused by the rest
of the 1200 baud $FF character because the receive data line is high [12]
just as it would be for the idle condition. If a character other than $FF is
sent as the first character, an SCI receive error could result.
Main Bootloader Program
Figure 3 is a flowchart of the main bootloader program in the
MC68HC711E9. This bootloader demonstrates the most important
features of the bootloaders used on all M68HC11 Family members. For
complete listings of other M68HC11 versions, refer to Listing 3.
MC68HC711E9 Bootloader ROM at the end of this application note,
and to Appendix B of the M68HC11 Reference Manual, Motorola
document order number M68HC11RM/AD.
The reset vector in the boot ROM points to the start [1] of this program.
The initialization block [2] establishes starting conditions and sets up the
SCI and port D. The stack pointer is set because there are push and pull
instructions in the bootloader program. The X index register is pointed at
the start of the register block ($1000) so indexed addressing can be
used. Indexed addressing takes one less byte of ROM space than
extended instructions, and bit manipulation instructions are not available
in extended addressing forms. The port D wire-OR mode (DWOM) bit in
the serial peripheral interface control register (SPCR) is set to configure
port D for wired-OR operation to minimize potential conflicts with
external systems that use the PD1/TxD pin as an input. The baud rate
for the SCI is initially set to 7812 baud at a 2-MHz E-clock rate but can
automatically switch to 1200 baud based on the first character received.
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The SCI receiver and transmitter are enabled. The receiver is required
by the bootloading process, and the transmitter is used to transmit data
back to the host computer for optional verification. The last item in the
initialization is to set an intercharacter delay constant used to terminate
the download when the host computer stops sending data to the
MC68HC711E9. This delay constant is stored in the timer output
compare 1 (TOC1) register, but the on-chip timer is not used in the
bootloader program. This example illustrates the extreme measures
used in the bootloader firmware to minimize memory usage. However,
such measures are not usually considered good programming technique
because they are misleading to someone trying to understand the
program or use it as an example.
After initialization, a break character is transmitted [3] by the SCI. By
connecting the TxD pin to the RxD pin (with a pullup because of port D
wired-OR mode), this break will be received as a $00 character and
cause an immediate jump [4] to the start of the on-chip EEPROM ($B600
in the MC68HC711E9). This feature is useful to pass control to a
program in EEPROM essentially from reset. Refer to Common
Bootstrap Mode Problems before using this feature.
If the first character is received as $FF, the baud rate is assumed to be
the default rate (7812 baud at a 2-MHz E-clock rate). If $FF was sent at
1200 baud by the host, the SCI will receive the character as $E0 or $C0
because of the baud rate mismatch, and the bootloader will switch to
1200 baud [5] for the rest of the download operation. When the baud rate
is switched to 1200 baud, the delay constant used to monitor the
intercharacter delay also must be changed to reflect the new character
time.
At [6], the Y index register is initialized to $0000 to point to the start of
on-chip RAM. The index register Y is used to keep track of where the
next received data byte will be stored in RAM. The main loop for loading
begins at [7].
The number of data bytes in the downloaded program can be any
number between 0 and 512 bytes (the size of on-chip RAM). This
procedure is called "variable-length download" and is accomplished by
ending the download sequence when an idle time of at least four
character times occurs after the last character to be downloaded. In
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M68HC11 Family members which have 256 bytes of RAM, the download
length is fixed at exactly 256 bytes plus the leading $FF character.
The intercharacter delay counter is started [8] by loading the delay
constant from TOC1 into the X index register. The 19-E-cycle wait loop
is executed repeatedly until either a character is received [9] or the
allowed intercharacter delay time expires [10]. For 7812 baud, the delay
constant is 10,241 E cycles (539 x 19 E cycles per loop). Four character
times at 7812 baud is 10,240 E cycles (baud prescale of 4 x baud divider
of 4 x 16 internal SCI clocks/bit time x 10 bit times/character x 4
character times). The delay from reset to the initial $FF character is not
critical since the delay counter is not started until after the first character
($FF) is received.
To terminate the bootloading sequence and jump to the start of RAM
without downloading any data to the on-chip RAM, simply send $FF and
nothing else. This feature is similar to the jump to EEPROM at [4] except
the $FF causes a jump to the start of RAM. This procedure requires that
the RAM has been loaded with a valid program since it would make no
sense to jump to a location in uninitialized memory.
After receiving a character, the downloaded byte is stored in RAM [11].
The data is transmitted back to the host [12] as an indication that the
download is progressing normally. At [13], the RAM pointer is
incremented to the next RAM address. If the RAM pointer has not
passed the end of RAM, the main download loop (from [7] to [14]) is
repeated.
When all data has been downloaded, the bootloader goes to [16]
because of an intercharacter delay timeout [10] or because the entire
512-byte RAM has been filled [15]. At [16], the X and Y index registers
are set up for calling the PROGRAM utility routine, which saves the user
from having to do this in a downloaded program. The PROGRAM utility
is fully explained in EPROM Programming Utility. The final step of the
bootloader program is to jump to the start of RAM [17], which starts the
user’s downloaded program.
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FROM RESET
IN BOOT MODE
[1]
START
[2]
INITIALIZATION:
SP = TOP OF RAM ($01FF)
X = START OF REGS ($1000)
SPCR = $20 (SET DWOM BIT)
BAUD = $A2 (÷ 4; ÷ 4) (7812.5 BAUD @ 2 MHz)
SCCR2 = $C0 (Tx & Rx ON)
TOC1 = DELAY CONSTANT (539 = 4 SCI CHARACTER TIMES)
[3]
SEND BREAK
NO
RECEIVED FIRST CHAR YET ?
YES
[4]
JUMP TO START
OF EEPROM ($B600)
YES
FIRST CHAR = $00 ?
NO
NOTZERO
NOTE THAT A BREAK
CHARACTER IS ALSO
RECEIVED AS $00
YES
FIRST CHAR = $FF ?
NO
[5]
SWITCH TO SLOWER SCI RATE...
BAUD = $33 (÷13; ÷ 8) (1200 BAUD @ 2 MHz)
CHANGE DELAY CONSTANT...
TOC1 = 3504 (4 SCI CHARACTER TIMES)
BAUDOK
[6]
POINT TO START OF RAM ( Y = $0000 )
[7]
WAIT
[8]
INITIALIZE TIMEOUT COUNT
WTLOOP
[9]
YES
RECEIVE DATA READY ?
NO
LOOP =
19
CYCLES
DECREMENT TIMEOUT COUNT
NO
TIMED OUT YET ?
[10]
YES
[11]
STORE RECEIVED DATA TO RAM ( ,Y )
TRANSMIT (ECHO) FOR VERIFY
POINT AT NEXT RAM LOCATION
[12]
[13]
[14]
NO
PAST END OF RAM ?
YES
[15]
STAR
SET UP FOR PROGRAM UTILITY:
X = PROGRAMMING TIME CONSTANT
Y = START OF EPROM
[16]
JUMP TO START
OF RAM ($0000)
[17]
Figure 3. MC68HC711E9 Bootloader Flowchart
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UPLOAD Utility
The UPLOAD utility subroutine transfers data from the MCU to a host
computer system over the SCI serial data link.
NOTE: Only EPROM versions of the M68HC11 include this utility.
Verification of EPROM contents is one example of how the UPLOAD
utility could be used. Before calling this program, the Y index register is
loaded (by user firmware) with the address of the first data byte to be
uploaded. If a baud rate other than the current SCI baud rate is to be
used for the upload process, the user’s firmware must also write to the
baud register. The UPLOAD program sends successive bytes of data
out the SCI transmitter until a reset is issued (the upload loop is infinite).
For a complete commented listing example of the UPLOAD utility, refer
to Listing 3. MC68HC711E9 Bootloader ROM.
EPROM Programming Utility
The EPROM programming utility is one way of programming data into
the internal EPROM of the MC68HC711E9 MCU. An external 12-V
programming power supply is required to program on-chip EPROM. The
simplest way to use this utility program is to bootload a 3-byte program
consisting of a single jump instruction to the start of the PROGRAM utility
program ($BF00). The bootloader program sets the X and Y index
registers to default values before jumping to the downloaded program
(see [16] at the bottom of Figure 3). When the host computer sees the
$FF character, data to be programmed into the EPROM is sent, starting
with the character for location $D000. After the last byte to be
programmed is sent to the MC68HC711E9 and the corresponding
verification data is returned to the host, the programming operation is
terminated by resetting the MCU.
The number of bytes to be programmed, the first address to be
programmed, and the programming time can be controlled by the user if
values other than the default values are desired.
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To understand the detailed operation of the EPROM programming utility,
refer to Figure 4 during the following discussion. Figure 4 is composed
of three interrelated parts. The upper-left portion shows the flowchart of
the PROGRAM utility running in the boot ROM of the MCU. The upper-
right portion shows the flowchart for the user-supplied driver program
running in the host computer. The lower portion of Figure 4 is a timing
sequence showing the relationship of operations between the MCU and
the host computer. Reference numbers in the flowcharts in the upper
half of Figure 4 have matching numbers in the lower half to help the
reader relate the three parts of the figure.
The shaded area [1] refers to the software and hardware latency in the
MCU leading to the transmission of a character (in this case, the $FF).
The shaded area [2] refers to a similar latency in the host computer (in
this case, leading to the transmission of the first data character to the
MCU).
The overall operation begins when the MCU sends the first character
($FF) to the host computer, indicating that it is ready for the first data
character. The host computer sends the first data byte [3] and enters its
main loop. The second data character is sent [4], and the host then waits
[5] for the first verify byte to come back from the MCU.
After the MCU sends $FF [8], it enters the WAIT1 loop [9] and waits for
the first data character from the host. When this character is received
[10], the MCU programs it into the address pointed to by the Y index
register. When the programming time delay is over, the MCU reads the
programmed data, transmits it to the host for verification [11], and
returns to the top of the WAIT1 loop to wait for the next data character
[12]. Because the host previously sent the second data character, it is
already waiting in the SCI receiver of the MCU. Steps [13], [14], and [15]
correspond to the second pass through the WAIT1 loop.
Back in the host, the first verify character is received, and the third data
character is sent [6]. The host then waits for the second verify character
[7] to come back from the MCU. The sequence continues as long as the
host continues to send data to the MCU. Since the WAIT1 loop in the
PROGRAM utility is an indefinite loop, reset is used to end the process
in the MCU after the host has finished sending data to be programmed.
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PROGRAM Utility in MCU
Driver Program in HOST
INITIALIZE...
X = PROGRAM TIME
Y = FIRST ADDRESS
HOST NORMALLY WAITS FOR $FF
FROM MCU BEFORE SENDING DATA
FOR EPROM PROGRAMMING
START
$BF00 - PROGRAM
START
INDICATES READY
TO HOST
[8]
[3]
SEND $FF
[9]
SEND FIRST DATA BYTE
DATA_LOOP
WAIT1
NO
MORE DATA TO SEND ?
NO
ANY DATA RECEIVED ?
YES
YES
SEND NEXT DATA [4] [6]
PROGRAM BYTE [10] [13]
[5] [7]
NO
READ PROGRAMMED DATA
AND SEND TO VERIFY
VERIFY DATA RECEIVED ?
YES
[11] [14]
NO
VERIFY DATA CORRECT ?
YES
INDICATE ERROR
POINT TO NEXT LOCATION
TO BE PROGRAMMED
[12] [15]
YES
MORE TO VERIFY ?
NO
PROGRAM CONTINUES
AS LONG AS DATA
IS RECEIVED
DONE
VERIFY DATA TO HOST
(SAME AS MCU Tx DATA)
$FF
[3]
V1
[6]
V2
D3
V3
V4
D5
[4]
HOST SENDING
DATA FOR
MCU EPROM
[5]
[1]
[7]
D4
MCU RECEIVE DATA (FROM HOST)
EPROM PROGRAMMING
D1
D2
[2]
[10]
[13]
MC68HC711E9
EXECUTING
"PROGRAM" LOOP
P1
P2
[12]
V1
P3
P4
[14]
[9]
[11]
[15]
[8]
MCU TRANSMIT DATA (VERIFY)
$FF
V2
V3
V4
Figure 4. Host and MCU Activity during EPROM PROGRAM Utility
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Allowing for Bootstrap Mode
Since bootstrap mode requires few connections to the MCU, it is easy to
design systems that accommodate bootstrap mode.
Bootstrap mode is useful for diagnosing or repairing systems that have
failed due to changes in the CONFIG register or failures of the expansion
address/data buses, (rendering programs in external memory useless).
Bootstrap mode can also be used to load information into the EPROM or
EEPROM of an M68HC11 after final assembly of a module. Bootstrap
mode is also useful for performing system checks and calibration
routines. The following paragraphs explain system requirements for use
of bootstrap mode in a product.
Mode Select Pins
It must be possible to force the MODA and MODB pins to logic 0, which
implies that these two pins should be pulled up to V through resistors
DD
rather than being tied directly to V . If mode pins are connected directly
DD
to V , it is not possible to force a mode other than the one the MCU is
DD
hard wired for. It is also good practice to use pulldown resistors to V
SS
rather than connecting mode pins directly to V because it is
SS
sometimes a useful debug aid to attempt reset in modes other than the
one the system was primarily designed for. Physically, this requirement
sometimes calls for the addition of a test point or a wire connected to one
or both mode pins. Mode selection only uses the mode pins while
RESET is active.
RESET
It must be possible to initiate a reset while the mode select pins are held
low. In systems where there is no provision for manual reset, it is usually
possible to generate a reset by turning power off and back on.
RxD Pin
It must be possible to drive the PD0/RxD pin with serial data from a host
computer (or another MCU). In many systems, this pin is already used
for SCI communications; thus no changes are required.
In systems where the PD0/RxD pin is normally used as a general-
purpose output, a serial signal from the host can be connected to the pin
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without resulting in output driver conflicts. It may be important to
consider what the existing logic will do with the SCI serial data instead of
the signals that would have been produced by the PD0 pin. In systems
where the PD0 pin is used normally as a general-purpose input, the
driver circuit that drives the PD0 pin must be designed so that the serial
data can override this driver, or the driver must be disconnected during
the bootstrap download. A simple series resistor between the driver and
the PD0 pin solves this problem as shown in Figure 5. The serial data
from the host computer can then be connected to the PD0/RxD pin, and
the series resistor will prevent direct conflict between the host driver and
the normal PD0 driver.
CONNECTED ONLY DURING
BOOTLOADING
FROM
HOST
SYSTEM
RS232
LEVEL
SHIFTER
MC68HC11
EXISTING
CONTROL
SIGNAL
RxD/PD0
(BEING USED
AS INPUT)
SERIES
RESISTOR
EXISTING
DRIVER
Figure 5. Preventing Driver Conflict
TxD Pin
The bootloader program uses the PD1/TxD pin to send verification data
back to the host computer. To minimize the possibility of conflicts with
circuitry connected to this pin, port D is configured for wire-OR mode by
the bootloader program during initialization. Since the wire-OR
configuration prevents the pin from driving active high levels, a pullup
resistor to V is needed if the TxD signal is used.
DD
In systems where the PD1/TxD pin is normally used as a general-
purpose output, there are no output driver conflicts. It may be important
to consider what the existing logic will do with the SCI serial data instead
of the signals that would have been produced by the PD1 pin.
In systems where the PD1 pin is normally used as a general-purpose
input, the driver circuit that drives the PD1 pin must be designed so that
the PD1/TxD pin driver in the MCU can override this driver. A simple
series resistor between the driver and the PD1 pin can solve this
problem. The TxD pin can then be configured as an output, and the
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series resistor will prevent direct conflict between the internal TxD driver
and the external driver connected to PD1 through the series resistor.
Other
The bootloader firmware sets the DWOM control bit, which configures all
port D pins for wire-OR operation. During the bootloading process, all
port D pins except the PD1/TxD pin are configured as high-impedance
inputs. Any port D pin that normally is used as an output should have a
pullup resistor so it does not float during the bootloading process.
Driving Boot Mode from Another M68HC11
A second M68HC11 system can easily act as the host to drive bootstrap
loading of an M68HC11 MCU. This method is used to examine and
program non-volatile memories in target M68HC11s in Motorola EVMs.
The following hardware and software example will demonstrate this and
other bootstrap mode features.
The schematic in Figure 6 shows the circuitry for a simple EPROM
duplicator for the MC68HC711E9. The circuitry is built in the wire-wrap
area of an M68HC11EVBU evaluation board to simplify construction.
The schematic shows only the important portions of the EVBU circuitry
to avoid confusion. To see the complete EVBU schematic, refer to the
M68HC11EVBU Universal Evaluation Board User’s Manual, Motorola
document order number M68HC11EVBU/D.
The default configuration of the EVBU must be changed to make the
appropriate connections to the circuitry in the wire-wrap area and to
configure the master MCU for bootstrap mode. A fabricated jumper must
be installed at J6 to connect the XTAL output of the master MCU to the
wire-wrap connector P5, which has been wired to the EXTAL input of the
target MCU. Cut traces that short across J8 and J9 must be cut on the
solder side of the printed circuit board to disconnect the normal SCI
connections to the RS232 level translator (U4) of the EVBU. The J8 and
J9 connections can be restored easily at a later time by installing
fabricated jumpers on the component side of the board. A fabricated
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jumper must be installed across J3 to configure the master MCU for
bootstrap mode.
One MC68HC711E9 is first programmed by other means with a desired
12-Kbyte program in its EPROM and a small duplicator program in its
EEPROM. Alternately, the ROM program in an MC68HC11E9 can be
copied into the EPROM of a target MC68HC711E9 by programming only
the duplicator program into the EEPROM of the master MC68HC11E9.
The master MCU is installed in the EVBU at socket U3. A blank
MC68HC711E9 to be programmed is placed in the socket in the wire-
wrap area of the EVBU (U6).
With the V power switch off, power is applied to the EVBU system. As
PP
power is applied to the EVBU, the master MCU (U3) comes out of reset
in bootstrap mode. Target MCU (U6) is held in reset by the PB7 output
of master MCU (U3). The PB7 output of U3 is forced to 0 when U3 is
reset. The master MCU will later release the reset signal to the target
MCU under software control. The RxD and TxD pins of the target MCU
(U6) are high-impedance inputs while U6 is in reset so they will not affect
the TxD and RxD signals of the master MCU (U3) while U3 is coming out
of reset. Since the target MCU is being held in reset with MODA and
MODB at 0, it is configured for the PROG EPROM emulation mode, and
PB7 is the output enable signal for the EPROM data I/O (input/output)
pins. Pullup resistor R7 causes the port D pins, including RxD and TxD,
to remain in the high-impedance state so they do not interfere with the
RxD and TxD pins of the master MCU as it comes out of reset.
As U3 leaves reset, its mode pins select bootstrap mode so the
bootloader firmware begins executing. A break is sent out the TxD pin of
U3. Pullup resistor R10 and resistor R9 cause the break character to be
seen at the RxD pin of U3. The bootloader performs a jump to the start
of EEPROM in the master MCU (U3) and starts executing the duplicator
program. This sequence demonstrates how to use bootstrap mode to
pass control to the start of EEPROM after reset.
The complete listing for the duplicator program in the EEPROM of the
master MCU is provided in Listing 1. MCU-to-MCU Duplicator
Program.
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COM +12.25V
M68HC11EVBU
PREWIRED AREA
WIRE-WRAP AREA
ON
V
R11
100
P4
50
P5
PP
+
OFF
C18
R14
15K
S2
20 µF
50
50
PE7
R15
10K
MASTER
MCU
U3
MC68HC711E9
18
17
XIRQ/V
RESET
PPE
R8
35
35
35
PB7
3.3K
V
DD
D5
41
41
42
41
42
26
1
PB1
V
DD
RED
C17
0.1 µF
R12 1K
R13 1K
D6
42
PB0
V
SS
GREEN
TARGET
MCU
U6
J6
J3
8
8
8
7
XTAL
EXTAL
V
V
DD
DD
2
MODB
35
20
PB7
RxD
R7
10K
R10
15K
21
21
20
21
20
TxD
R9
[1]
10K
20
21
RxD
TxD
[2]
3
2
MODA
MODB
J8
J9
TO/FROM
RS232 LEVEL
TRANSLATOR
U4
Figure 6. MCU-to-MCU EPROM Duplicator Schematic
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The duplicator program in EEPROM clears the DWOM control bit to
change port D (thus, TxD) of U3 to normal driven outputs. This
configuration will prevent interference due to R9 when TxD from the
target MCU (U6) becomes active. Series resistor R9 demonstrates how
TxD of U3 can drive RxD of U3[1] and later TxD of U6 can drive RxD of
U3 without a destructive conflict between the TxD output buffers.
As the target MCU (U6) leaves reset, its mode pins select bootstrap
mode so the bootloader firmware begins executing. A break is sent out
the TxD pin of U6. At this time, the TxD pin of U3 is at a driven high so
R9 acts as a pullup resistor for TxD of the target MCU (U6). The break
character sent from U6 is received by U3 so the duplicator program that
is running in the EEPROM of the master MCU knows that the target
MCU is ready to accept a bootloaded program.
The master MCU sends a leading $FF character to set the baud rate in
the target MCU. Next, the master MCU passes a 3-instruction program
to the target MCU and pauses so the bootstrap program in the target
MCU will stop the loading process and jump to the start of the
downloaded program. This sequence demonstrates the variable-length
download feature of the MC68HC711E9 bootloader.
The short program downloaded to the target MCU clears the DWOM bit
to change its TxD pin to a normal driven CMOS output and jumps to the
EPROM programming utility in the bootstrap ROM of the target MCU.
Note that the small downloaded program did not have to set up the SCI
or initialize any parameters for the EPROM programming process. The
bootstrap software that ran prior to the loaded program left the SCI
turned on and configured in a way that was compatible with the SCI in
the master MCU (the duplicator program in the master MCU also did not
have to set up the SCI for the same reason). The programming time and
starting address for EPROM programming in the target MCU were also
set to default values by the bootloader software before jumping to the
start of the downloaded program.
Before the EPROM in the target MCU can be programmed, the V
PP
power supply must be available at the XIRQ/V
pin of the target MCU.
PPE
The duplicator program running in the master MCU monitors this voltage
(for presence or absence, not level) at PE7 through resistor divider
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R14–Rl5. The PE7 input was chosen because the internal circuitry for
port E pins can tolerate voltages slightly higher than V ; therefore,
DD
resistors R14 and R15 are less critical. No data to be programmed is
passed to the target MCU until the master MCU senses that V has
PP
been stable for about 200 ms.
When V is ready, the master MCU turns on the red LED (light-emitting
PP
diode) and begins passing data to the target MCU. EPROM
Programming Utility explains the activity as data is sent from the
master MCU to the target MCU and programmed into the EPROM of the
target. The master MCU in the EVBU corresponds to the HOST in the
programming utility description and the "PROGRAM utility in MCU" is
running in the bootstrap ROM of the target MCU.
Each byte of data sent to the target is programmed and then the
programmed location is read and sent back to the master for verification.
If any byte fails, the red and green LEDs are turned off, and the
programming operation is aborted. If the entire 12 Kbytes are
programmed and verified successfully, the red LED is turned off, and the
green LED is turned on to indicate success. The programming of all 12
Kbytes takes about 30 seconds.
After a programming operation, the V switch (S2) should be turned off
PP
before the EVBU power is turned off.
V
CUT TRACE
AS SHOWN
DD
RN1D
47K
TO MCU
XIRQ/VPPE
PIN
1
3
1
7
+
P4-18
P5-18
47
J7
48
46
44
9
8
10
1
FROM OC5 PIN
OF MCU
2
45
41
15
REMOVE J7
JUMPER
38
13
25
28 19
27
J14
20
34
35
1
21
33
TO
MC68HC68T1
BE SURE NO
JUMPER IS
ON J14
Figure 7. Isolating EVBU XIRQ Pin
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Listing 1. MCU-to-MCU Duplicator Program
1
2
**************************************************
* 68HC711E9 Duplicator Program for AN1060
3
**************************************************
4
5
*****
6
* Equates - All reg addrs except INIT are 2-digit
7
*
for direct addressing
8
*****
INIT
SPCR
PORTB
9 103D
10 0028
11 0004
12
EQU
EQU
EQU
$103D
$28
$04
RAM, Reg mapping
DWOM in bit-5
Red LED = bit-1, Grn = bit-0
* Reset of prog socket = bit-7
13 0080
14 0002
15 0001
16 000A
17 002E
18
RESET
RED
GREEN
PORTE
SCSR
EQU
EQU
EQU
EQU
EQU
%10000000
%00000010
%00000001
$0A
Vpp Sense in bit-7, 1=ON
SCI status register
$2E
* TDRE, TC, RDRF, IDLE; OR, NF, FE, -
19 0080
20 0020
21 002F
22 BF00
23 D000
24
TDRE
RDRF
SCDR
PROGRAM
EPSTRT
EQU
EQU
EQU
EQU
EQU
%10000000
%00100000
$2F
$BF00
$D000
SCI data register
EPROM prog utility in boot ROM
Starting address of EPROM
25 B600
26
ORG
$B600
Start of EEPROM
27
28
**************************************************
*
29 B600 7F103D
30 B603 8604
31 B605 9728
32 B607 8680
33 B609 9704
BEGIN
CLR
INIT
#$04
SPCR
#RESET
PORTB
Moves Registers to $0000-3F
Pattern for DWOM off, no SPI
Turns off DWOM in EVBU MCU
LDAA
STAA
LDAA
STAA
Release reset to target MCU
34 B60B 132E20FC WT4BRK
35 B60F 86FF
36 B611 972F
BRCLR SCSR RDRF WT4BRK Loop till char received
LDAA
STAA
LDX
#$FF
SCDR
#BLPROG
SEND1
Leading char for bootload ...
to target MCU
Point at program for target
Bootload to target
37 B613 CEB675
38 B616 8D53
39 B618 8CB67D
40 B61B 26F9
41
BLLOOP
*****
BSR
CPX
BNE
#ENDBPR
BLLOOP
Past end ?
Continue till all sent
42
43
44
* Delay for about 4 char times to allow boot related
* SCI communications to finish before clearing
* Rx related flags
45 B61D CE06A7
46 B620 09
47 B621 26FD
48 B623 962E
49 B625 962F
LDX
DEX
BNE
LDAA
LDAA
#1703
# of 6 cyc loops
[3]
[3] Total loop time = 6 cyc
Read status (RDRF will be set)
Read SCI data reg to clear RDRF
DLYLP
DLYLP
SCSR
SCDR
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50
51
52
*****
* Now wait for character from target to indicate it's ready for
* data to be programmed into EPROM
53 B627 132E20FC WT4FF
54 B62B 962F
55 B62D CED000
BRCLR SCSR RDRF WT4FF Wait for RDRF
LDAA
LDX
SCDR
#EPSTRT
Clear RDRF, don't need data
Point at start of EPROM
56
* Handle turn-on of Vpp
57 B630 18CE523D WT4VPP
58 B634 150402
LDY
#21053
PORTB RED
PORTE
WT4VPP
PORTB RED
Delay counter (about 200ms)
Turn off RED LED
[3] Wait for Vpp to be ON
[3] Vpp sense is on port E MSB
[6] Turn on RED LED
BCLR
LDAA
BPL
BSET
DEY
59 B637 960A
60 B639 2AF5
61 B63B 140402
62 B63E 1809
63 B640 26F5
64
DLYLP2
[4]
BNE
DLYLP2
[3] Total loop time = 19 cyc
* Vpp has been stable for 200ms
65
66 B642 18CED000
67 B646 8D23
68 B648 8C0000
69 B64B 2702
70 B64D 8D1C
71 B64F 132E20FC VERF
72 B653 962F
73 B655 18A100
74 B658 2705
75 B65A 150403
76 B65D 2007
77 B65F
LDY
BSR
CPX
BEQ
BSR
#EPSTRT
SEND1
#0
VERF
SEND1
X=Tx pointer, Y=verify pointer
Send first data to target
X points at $0000 after last
Skip send if no more
Send another data char
Wait for Rx ready
Get char and clr RDRF
Does char verify ?
Skip error if OK
DATALP
BRCLR SCSR RDRF VERF
LDAA
CMPA
BEQ
BCLR
BRA
SCDR
0,Y
VERFOK
PORTB (RED+GREEN) Turn off LEDs
DUNPRG
Done (programming failed)
78 B65F 1808
79 B661 26E5
80 B663
VERFOK
INY
BNE
Advance verify pointer
Continue till all done
DATALP
81 B663 140401
82 B666
BSET
PORTB GREEN
Grn LED ON
83 B666 150482
84 B669 20FE
85 B66B
DUNPRG
BCLR
BRA
PORTB (RESET+RED) Red OFF, apply reset
Done so just hang
*
86
87
**************************************************
* Subroutine to get & send an SCI char. Also
88
89
*
advances pointer (X).
**************************************************
SEND1 LDAA 0,X Get a character
BRCLR SCSR TDRE TRDYLP Wait for TDRE
90 B66B A600
91 B66D 132E80FC TRDYLP
92 B671 972F
93 B673 08
STAA
INX
SCDR
Send character
Advance pointer
** Return **
94 B674 39
RTS
95
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96
97
**************************************************
* Program to be bootloaded to target '711E9
98
**************************************************
99 B675 8604
100 B677 B71028
101
BLPROG
LDAA
STAA
#$04
$1028
Pattern for DWOM off, no SPI
Turns off DWOM in target MCU
* NOTE: Can't use direct addressing in target MCU because
102
*
regs are located at $1000.
103 B67A 7EBF00
104 B67D
JMP
EQU
PROGRAM
*
Jumps to EPROM prog routine
ENDBPR
Symbol Table:
Symbol Name
Value Def.# Line Number Cross Reference
BEGIN
BLLOOP
BLPROG
DATALP
DLYLP
DLYLP2
DUNPRG
ENDBPR
EPSTRT
GREEN
INIT
B600 *00029
B616 *00038 00040
B675 *00099 00037
B648 *00068 00079
B620 *00046 00047
B637 *00059 00063
B666 *00083 00076
B67D *00104 00039
D000 *00023 00055 00066
0001 *00015 00075 00081
103D *00009 00029
PORTB
PORTE
PROGRAM
RDRF
RED
RESET
SCDR
SCSR
SEND1
SPCR
0004 *00011 00033 00058 00061 00075 00081 00083
000A *00016 00059
BF00 *00022 00103
0020 *00020 00034 00053 00071
0002 *00014 00058 00061 00075 00083
0080 *00013 00032 00083
002F *00021 00036 00049 00054 00072 00092
002E *00017 00034 00048 00053 00071 00091
B66B *00090 00038 00067 00070
0028 *00010 00031
TDRE
0080 *00019 00091
TRDYLP
VERF
VERFOK
WT4BRK
WT4FF
WT4VPP
B66D *00091 00091
B64F *00071 00069 00071
B65F *00078 00074
B60B *00034 00034
B627 *00053 00053
B630 *00057 00060
Errors: None
Labels: 28
Last Program Address: $B67C
Last Storage Address: $0000
Program Bytes: $007D 125
Storage Bytes: $0000
0
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Driving Boot Mode from a Personal Computer
In this example, a personal computer is used as the host to drive the
bootloader of an MC68HC711E9. An M68HC11 EVBU is used for the
target MC68HC711E9. A large program is transferred from the personal
computer into the EPROM of the target MC68HC711E9.
Hardware
Figure 7 shows a small modification to the EVBU to accommodate the
12-volt (nominal) EPROM programming voltage. The XIRQ pin is
connected to a pullup resistor, two jumpers, and the 60-pin connectors,
P4 and P5. The object of the modification is to isolate the XIRQ pin and
then connect it to the programming power supply. Carefully cut the trace
on the solder side of the EVBU as indicated in Figure 7. This
disconnects the pullup resistor RN1 D from XIRQ but leaves P4–18,
P5–18, and jumpers J7 and J14 connected so the EVBU can still be
used for other purposes after programming is done. Remove any
fabricated jumpers from J7 and J14. The EVBU normally has a jumper
at J7 to support the trace function
Figure 8 shows a small circuit that is added to the wire-wrap area of the
EVBU. The 3-terminal jumper allows the XIRQ line to be connected to
either the programming power supply or to a substitute pullup resistor for
XIRQ. The 100-ohm resistor is a current limiter to protect the 12-volt
input of the MCU. The resistor and LED connected to P5 pin 9 (port C
bit 0) is an optional indicator that lights when programming is complete.
Software
BASIC was chosen as the programming language due to its readability
and availability in parallel versions on both the IBM PC and the
Macintosh . The program demonstrates several programming
techniques for use with an M68HC11 and is not necessarily intended to
be a finished, commercial program. For example, there is little error
checking, and the user interface is elementary. A complete listing of the
BASIC program is included in Listing 2. BASIC Program for Personal
Computer with moderate comments. The following paragraphs include
IBM is a registered trademark of International Business Machines.
Macintosh is a registered trademark of Apple Computers, Inc.
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a more detailed discussion of the program as it pertains to
communicating with and programming the target MC68HC711E9. Lines
25–45 initialize and define the variables and array used in the program.
Changes to this section would allow for other programs to be
downloaded.
V
DD
47K
NORMAL EVBU
OPERATION
TO P5-18
(XIRQ/V
)
100
PPE
PROGRAM
EPROM
+12.25 V
+
JUMPER
20 µF
PROGRAMMING
POWER
COMMON
PC0
P5-9
1K
LED
Figure 8. PC-to-MCU Programming Circuit
Lines 50–95 read in the small bootloader from DATA statements at the
end of the listing. The source code for this bootloader is presented in the
DATA statements. The bootloaded code makes port C bit 0 low,
initializes the X and Y registers for use by the EPROM programming
utility routine contained in the boot ROM, and then jumps to that routine.
The hexadecimal values read in from the DATA statements are
converted to binary values by a subroutine. The binary values are then
saved as one string (BOOTCODE$).
The next long section of code (lines 97–1250) reads in the S records
from an external disk file (in this case, BUF34.S19), converts them to
integer, and saves them in an array. The techniques used in this section
show how to convert ASCII S records to binary form that can be sent
(bootloaded) to an M68HC11.
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This S-record translator only looks for the S1 records that contain the
actual object code. All other S-record types are ignored.
When an S1 record is found (lines 1000–1024), the next two characters
form the hex byte giving the number of hex bytes to follow. This byte is
converted to integer by the same subroutine that converted the
bootloaded code from the DATA statements. This BYTECOUNT is
adjusted by subtracting 3, which accounts for the address and checksum
bytes and leaves just the number of object-code bytes in the record.
Starting at line 1100, the 2-byte (4-character) starting address is
converted to decimal. This address is the starting address for the object
code bytes to follow. An index into the CODE% array is formed by
subtracting the base address initialized at the start of the program from
the starting address for this S record.
A FOR-NEXT loop starting at line 1130 converts the object code bytes
to decimal and saves them in the CODE% array. When all the object
code bytes have been converted from the current S record, the program
loops back to find the next S1 record.
A problem arose with the BASIC programming technique used. The draft
versions of this program tried saving the object code bytes directly as
binary in a string array. This caused "Out of Memory" or "Out of String
Space" errors on both a 2-Mbyte Macintosh and a 640-Kbyte PC. The
solution was to make the array an integer array and perform the integer-
to-binary conversion on each byte as it is sent to the target part.
The one compromise made to accommodate both Macintosh and PC
versions of BASIC is in lines 1500 and 1505. Use line 1500 and
comment out line 1505 if the program is to be run on a Macintosh, and,
conversely, use line 1505 and comment out line 1500 if a PC is used.
After the COM port is opened, the code to be bootloaded is modified by
adding the $FF to the start of the string. $FF synchronizes the bootloader
in the MC68HC711E9 to 1200 baud. The entire string is simply sent to
the COM port by PRINTing the string. This is possible since the string is
actually queued in BASIC’s COM buffer, and the operating system takes
care of sending the bytes out one at a time. The M68HC11 echoes the
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data received for verification. No automatic verification is provided,
though the data is printed to the screen for manual verification.
Once the MCU has received this bootloaded code, the bootloader
automatically jumps to it. The small bootloaded program in turn includes
a jump to the EPROM programming routine in the boot ROM.
Refer to the previous explanation of the EPROM Programming Utility
for the following discussion. The host system sends the first byte to be
programmed through the COM port to the SCI of the MCU. The SCI port
on the MCU buffers one byte while receiving another byte, increasing the
throughput of the EPROM programming operation by sending the
second byte while the first is being programmed.
When the first byte has been programmed, the MCU reads the EPROM
location and sends the result back to the host system. The host then
compares what was actually programmed to what was originally sent. A
message indicating which byte is being verified is displayed in the lower
half of the screen. If there is an error, it is displayed at the top of the
screen.
As soon as the first byte is verified, the third byte is sent. In the
meantime, the MCU has already started programming the second byte.
This process of verifying and queueing a byte continues until the host
finishes sending data. If the programming is completely successful, no
error messages will have been displayed at the top of the screen.
Subroutines follow the end of the program to handle some of the
repetitive tasks. These routines are short, and the commenting in the
source code should be sufficient explanation.
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Modifications
This example programmed version 3.4 of the BUFFALO monitor into the
EPROM of an MC68HC711E9; the changes to the BASIC program to
download some other program are minor.
The necessary changes are:
1. In line 30, the length of the program to be downloaded must be
assigned to the variable CODESIZE%.
2. Also in line 30, the starting address of the program is assigned to
the variable ADRSTART.
3. In line 9570, the start address of the program is stored in the third
and fourth items in that DATA statement in hexadecimal.
4. If any changes are made to the number of bytes in the boot code
in the DATA statements in lines 9500–9580, then the new count
must be set in the variable "BOOTCOUNT" in line 25.
Operation
Configure the EVBU for boot mode operation by putting a jumper at J3.
Ensure that the trace command jumper at J7 is not installed because this
would connect the 12-V programming voltage to the OC5 output of the
MCU.
Connect the EVBU to its dc power supply. When it is time to program the
MCU EPROM, turn on the 12-volt programming power supply to the new
circuitry in the wire-wrap area.
Connect the EVBU serial port to the appropriate serial port on the host
system. For the Macintosh, this is the modem port with a modem cable.
For the MS-DOS computer, it is connected to COM1 with a straight
through or modem cable. Power up the host system and start the BASIC
program. If the program has not been compiled, this is accomplished
from within the appropriate BASIC compiler or interpreter. Power up the
EVBU.
Answer the prompt for filename with either a [RETURN] to accept the
default shown or by typing in a new filename and pressing [RETURN].
MS-DOS is a registered trademark of Microsoft Corporation in the United States and other
countries.
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The program will inform the user that it is working on converting the file
from S records to binary. This process will take from 30 seconds to a few
minutes, depending on the computer.
A prompt reading, "Comm port open?" will appear at the end of the file
conversion. This is the last chance to ensure that everything is properly
configured on the EVBU. Pressing [RETURN] will send the bootcode to
the target MC68HC711E9. The program then informs the user that the
bootload code is being sent to the target, and the results of the echoing
of this code are displayed on the screen.
Another prompt reading "Programming is ready to begin. Are you?" will
appear. Turn on the 12-volt programming power supply and press
[RETURN] to start the actual programming of the target EPROM.
A count of the byte being verified will be updated continually on the
screen as the programming progresses. Any failures will be flagged as
they occur.
When programming is complete, a message will be displayed as well as
a prompt requesting the user to press [RETURN] to quit.
Turn off the 12-volt programming power supply before turning off 5 volts
to the EVBU.
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Listing 2. BASIC Program for Personal Computer
1 ' ***********************************************************************
2 ' *
3 ' *
4 ' *
5 ' *
6 ' *
7 ' *
8 ' *
9 ' *
10 '*
11 '*
12 '*
14 '*
E9BUF.BAS - A PROGRAM TO DEMONSTRATE THE USE OF THE BOOT MODE
ON THE HC11 BY PROGRAMMING AN HC711E9 WITH
BUFFALO 3.4
REQUIRES THAT THE S-RECORDS FOR BUFFALO (BUF34.S19)
BE AVAILABLE IN THE SAME DIRECTORY OR FOLDER
THIS PROGRAM HAS BEEN RUN BOTH ON A MS-DOS COMPUTER
USING QUICKBASIC 4.5 AND ON A MACINTOSH USING
QUICKBASIC 1.0.
15 '************************************************************************
25 H$ = "0123456789ABCDEF" 'STRING TO USE FOR HEX CONVERSIONS
30 DEFINT B, I: CODESIZE% = 8192: ADRSTART= 57344!
35 BOOTCOUNT = 25
'NUMBER OF BYTES IN BOOT CODE
40 DIM CODE%(CODESIZE%)
45 BOOTCODE$ = ""
'BUFFALO 3.4 IS 8K BYTES LONG
'INITIALIZE BOOTCODE$ TO NULL
49 REM ***** READ IN AND SAVE THE CODE TO BE BOOT LOADED *****
50 FOR I = 1 TO BOOTCOUNT
55 READ Q$
'# OF BYTES IN BOOT CODE
60 A$ = MID$(Q$, 1, 1)
65 GOSUB 7000
70 TEMP = 16 * X
75 A$ = MID$(Q$, 2, 1)
80 GOSUB 7000
'CONVERTS HEX DIGIT TO DECIMAL
'HANG ON TO UPPER DIGIT
85 TEMP = TEMP + X
90 BOOTCODE$ = BOOTCODE$ + CHR$(TEMP)
95 NEXT I
'BUILD BOOT CODE
96 REM ***** S-RECORD CONVERSION STARTS HERE *****
97 FILNAM$="BUF34.S19"
'DEFAULT FILE NAME FOR S-RECORDS
100 CLS
105 PRINT "Filename.ext of S-record file to be downloaded (";FILNAM$;") ";
107 INPUT Q$
110 IF Q$<>"" THEN FILNAM$=Q$
120 OPEN FILNAM$ FOR INPUT AS #1
130 PRINT : PRINT "Converting "; FILNAM$; " to binary..."
999 REM ***** SCANS FOR 'S1' RECORDS *****
1000 GOSUB 6000
'GET 1 CHARACTER FROM INPUT FILE
'FLAG IS EOF FLAG FROM SUBROUTINE
1010 IF FLAG THEN 1250
1020 IF A$ <> "S" THEN 1000
1022 GOSUB 6000
1024 IF A$ <> "1" THEN 1000
1029 REM ***** S1 RECORD FOUND, NEXT 2 HEX DIGITS ARE THE BYTE COUNT *****
1030 GOSUB 6000
1040 GOSUB 7000
'RETURNS DECIMAL IN X
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1050 BYTECOUNT = 16 * X
1060 GOSUB 6000
'ADJUST FOR HIGH NIBBLE
1070 GOSUB 7000
1080 BYTECOUNT = BYTECOUNT + X
1090 BYTECOUNT = BYTECOUNT - 3
'ADD LOW NIBBLE
'ADJUST FOR ADDRESS + CHECKSUM
1099 REM ***** NEXT 4 HEX DIGITS BECOME THE STARTING ADDRESS FOR THE DATA *****
1100 GOSUB 6000
1102 GOSUB 7000
'GET FIRST NIBBLE OF ADDRESS
'CONVERT TO DECIMAL
1104 ADDRESS= 4096 * X
1106 GOSUB 6000
'GET NEXT NIBBLE
1108 GOSUB 7000
1110 ADDRESS= ADDRESS+ 256 * X
1112 GOSUB 6000
1114 GOSUB 7000
1116 ADDRESS= ADDRESS+ 16 * X
1118 GOSUB 6000
1120 GOSUB 7000
1122 ADDRESS= ADDRESS+ X
1124 ARRAYCNT = ADDRESS-ADRSTART
'INDEX INTO ARRAY
1129 REM ***** CONVERT THE DATA DIGITS TO BINARY AND SAVE IN THE ARRAY *****
1130 FOR I = 1 TO BYTECOUNT
1140 GOSUB 6000
1150 GOSUB 7000
1160 Y = 16 * X
1170 GOSUB 6000
1180 GOSUB 7000
1190 Y = Y + X
'SAVE UPPER NIBBLE OF BYTE
'ADD LOWER NIBBLE
1200 CODE%(ARRAYCNT) = Y
1210 ARRAYCNT = ARRAYCNT + 1
1220 NEXT I
'SAVE BYTE IN ARRAY
'INCREMENT ARRAY INDEX
1230 GOTO 1000
1250 CLOSE 1
1499 REM ***** DUMP BOOTLOAD CODE TO PART *****
1500 'OPEN "R",#2,"COM1:1200,N,8,1" 'Macintosh COM statement
1505 OPEN "COM1:1200,N,8,1,CD0,CS0,DS0,RS" FOR RANDOM AS #2 'DOS COM statement
1510 INPUT "Comm port open"; Q$
1512 WHILE LOC(2) >0
1513 GOSUB 8020
1514 WEND
'FLUSH INPUT BUFFER
1515 PRINT : PRINT "Sending bootload code to target part..."
1520 A$ = CHR$(255) + BOOTCODE$ 'ADD HEX FF TO SET BAUD RATE ON TARGET HC11
1530 GOSUB 6500
1540 PRINT
1550 FOR I = 1 TO BOOTCOUNT
1560 GOSUB 8000
'# OF BYTES IN BOOT CODE BEING ECHOED
1564 K=ASC(B$):GOSUB 8500
1565 PRINT "Character #"; I; " received = "; HX$
1570 NEXT I
1590 PRINT "Programming is ready to begin.": INPUT "Are you ready"; Q$
1595 CLS
1597 WHILE LOC(2) > 0
'FLUSH INPUT BUFFER
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1598 GOSUB 8020
1599 WEND
1600 XMT = 0: RCV = 0
'POINTERS TO XMIT AND RECEIVE BYTES
1610 A$ = CHR$(CODE%(XMT))
1620 GOSUB 6500
1625 FOR I = 1 TO CODESIZE% - 1
1630 A$ = CHR$(CODE%(I))
1635 GOSUB 6500
'SEND FIRST BYTE
'ZERO BASED ARRAY 0 -> CODESIZE-1
'SEND SECOND BYTE TO GET ONE IN QUEUE
'SEND IT
1640 GOSUB 8000
'GET BYTE FOR VERIFICATION
1650 RCV = I - 1
1660 LOCATE 10,1:PRINT "Verifying byte #"; I; "
1664 IF CHR$(CODE%(RCV)) = B$ THEN 1670
1665 K=CODE%(RCV):GOSUB 8500
"
1666 LOCATE 1,1:PRINT "Byte #"; I; "
1668 K=ASC(B$):GOSUB 8500
1669 PRINT " Received "; HX$;
1670 NEXT I
", " - Sent "; HX$;
1680 GOSUB 8000
'GET BYTE FOR VERIFICATION
1690 RCV = CODESIZE% - 1
1700 LOCATE 10,1:PRINT "Verifying byte #"; CODESIZE%; "
1710 IF CHR$(CODE%(RCV)) = B$ THEN 1720
1713 K=CODE(RCV):GOSUB 8500
"
1714 LOCATE 1,1:PRINT "Byte #"; CODESIZE%; "
1715 K=ASC(B$):GOSUB 8500
", " - Sent "; HX$;
1716 PRINT " Received "; HX$;
1720 LOCATE 8, 1: PRINT : PRINT "Done!!!!"
4900 CLOSE
4910 INPUT "Press [RETURN] to quit...", Q$
5000 END
5900 '***********************************************************************
5910 '*
5930 '*
SUBROUTINE TO READ IN ONE BYTE FROM A DISK FILE
RETURNS BYTE IN A$
5940 '***********************************************************************
6000 FLAG = 0
6010 IF EOF(1) THEN FLAG = 1: RETURN
6020 A$ = INPUT$(1, #1)
6030 RETURN
6490 '***********************************************************************
6492 '*
6494 '*
SUBROUTINE TO SEND THE STRING IN A$ OUT TO THE DEVICE
OPENED AS FILE #2.
6496 '***********************************************************************
6500 PRINT #2, A$;
6510 RETURN
6590 '***********************************************************************
6594 '*
SUBROUTINE THAT CONVERTS THE HEX DIGIT IN A$ TO AN INTEGER
6596 '***********************************************************************
7000 X = INSTR(H$, A$)
7010 IF X = 0 THEN FLAG = 1
7020 X = X - 1
7030 RETURN
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7990 '**********************************************************************
7992 '*
7994 '*
7996 '*
7998 '*
SUBROUTINE TO READ IN ONE BYTE THROUGH THE COMM PORT OPENED
AS FILE #2. WAITS INDEFINITELY FOR THE BYTE TO BE
RECEIVED. SUBROUTINE WILL BE ABORTED BY ANY
KEYBOARD INPUT. RETURNS BYTE IN B$. USES Q$.
7999 '**********************************************************************
8000 WHILE LOC(2) = 0 'WAIT FOR COMM PORT INPUT
8005 Q$ = INKEY$: IF Q$ <> "" THEN 4900 'IF ANY KEY PRESSED, THEN ABORT
8010 WEND
8020 B$ = INPUT$(1, #2)
8030 RETURN
8490 '************************************************************************
8491 '*
8492 '*
8493 '*
DECIMAL TO HEX CONVERSION
INPUT: K - INTEGER TO BE CONVERTED
OUTPUT: HX$ - TWO CHARACTER STRING WITH HEX CONVERSION
8494 '************************************************************************
8500 IF K > 255 THEN HX$="Too big":GOTO 8530
8510 HX$=MID$(H$,K\16+1,1)
'UPPER NIBBLE
8520 HX$=HX$+MID$(H$,(K MOD 16)+1,1) 'LOWER NIBBLE
8530 RETURN
9499 '******************** BOOT CODE ****************************************
9500 DATA 86, 23
9510 DATA B7, 10, 02
9520 DATA 86, FE
9530 DATA B7, 10, 03
9540 DATA C6, FF
9550 DATA F7, 10, 07
9560 DATA CE, 0F, A0
9570 DATA 18, CE, E0, 00
9580 DATA 7E, BF, 00
'LDAA
'STAA
'LDAA
'STAA
'LDAB
'STAB
'LDX
#$23
OPT2
#$FE
PORTC
#$FF
DDRC
#4000
make port C wire or
light 1 LED on port C bit 0
make port C outputs
2msec at 2MHz
'LDY
'JMP
#$E000 Start of BUFFALO 3.4
$BF00 EPROM routine start address
9590 '***********************************************************************
Common Bootstrap Mode Problems
It is not unusual for a user to encounter problems with bootstrap mode
because it is new to many users. By knowing some of the common
difficulties, the user can avoid them or at least recognize and quickly
correct them.
Reset Conditions
vs. Conditions
as Bootloaded
Program Starts
It is common to confuse the reset state of systems and control bits with
the state of these systems and control bits when a bootloaded program
in RAM starts.
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Between these times, the bootloader program is executed, which
changes the states of some systems and control bits:
•
•
•
•
•
•
The SCI system is initialized and turned on (Rx and Tx).
The SCI system has control of the PD0 and PD1 pins.
Port D outputs are configured for wire-OR operation.
The stack pointer is initialized to the top of RAM.
Time has passed (two or more SCI character times).
Timer has advanced from its reset count value.
Users also forget that bootstrap mode is a special mode. Thus,
privileged control bits are accessible, and write protection for some
registers is not in effect. The bootstrap ROM is in the memory map. The
DISR bit in the TEST1 control register is set, which disables resets from
the COP and clock monitor systems.
Since bootstrap is a special mode, these conditions can be changed by
software. The bus can even be switched from single-chip mode to
expanded mode to gain access to external memories and peripherals.
Connecting RxD
To force an immediate jump to the start of EEPROM, the bootstrap
firmware looks for the first received character to be $00 (or break). The
data reception logic in the SCI looks for a 1-to-0 transition on the RxD
pin to synchronize to the beginning of a receive character. If the RxD pin
is tied to ground, no 1-to-0 transition occurs. The SCI transmitter sends
a break character when the bootloader firmware starts, and this break
character can be fed back to the RxD pin to cause the jump to EEPROM.
Since TxD is configured as an open-drain output, a pullup resistor is
required.
to V Does Not
SS
Cause the SCI
to Receive a Break
$FF Character Is
Required before
Loading into RAM
The initial character (usually $FF) that sets the download baud rate is
often forgotten.
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Original M68HC11
Versions Required
Exactly 256 Bytes
to be Downloaded
to RAM
Even users that know about the 256 bytes of download data sometimes
forget the initial $FF that makes the total number of bytes required for the
entire download operation equal to 256 + 1 or 257 bytes.
Variable-Length
Download
When on-chip RAM surpassed 256 bytes, the time required to serially
load this many characters became more significant. The variable-length
download feature allows shorter programs to be loaded without
sacrificing compatibility with earlier fixed-length download versions of
the bootloader. The end of a download is indicated by an idle RxD line
for at least four character times. If a personal computer is being used to
send the download data to the MCU, there can be problems keeping
characters close enough together to avoid tripping the end-of-download
detect mechanism. Using 1200 as the baud rate rather than the faster
default rate may help this problem.
Assemblers often produce S-record encoded programs which must be
converted to binary before bootloading them to the MCU. The process of
reading S-record data from a file and translating it to binary can be slow,
depending on the personal computer and the programming language
used for the translation. One strategy that can be used to overcome this
problem is to translate the file into binary and store it into a RAM array
before starting the download process. Data can then be read and
downloaded without the translation or file-read delays.
The end-of-download mechanism goes into effect when the initial $FF is
received to set the baud rate. Any amount of time may pass between
reset and when the $FF is sent to start the download process.
EPROM/OTP
Versions
of M68HC11
Have an EPROM
Emulation Mode
The conditions that configure the MCU for EPROM emulation mode are
essentially the same as those for resetting the MCU in bootstrap mode.
While RESET is low and mode select pins are configured for bootstrap
mode (low), the MCU is configured for EPROM emulation mode.
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The port pins that are used for EPROM data I/O lines may be inputs or
outputs, depending on the pin that is emulating the EPROM output
enable pin (OE). To make these data pins appear as high-impedance
inputs as they would on a non-EPROM part in reset, connect the
PB7/(OE) pin to a pullup resistor.
Bootloading
a Program
to Perform
The bootloader ROM must be turned off before performing the
checksum program. To remove the boot ROM from the memory map,
clear the RBOOT bit in the HPRIO register. This is normally a write-
protected bit that is 0, but in bootstrap mode it is reset to 1 and can be
written. If the boot ROM is not disabled, the checksum routine will read
the contents of the boot ROM rather than the user’s mask ROM or
EPROM at the same addresses.
a ROM Checksum
Inherent Delays
Caused
This problem is troublesome in cases where one MCU is bootloading to
another MCU.
by Double
Buffering
of SCI Data
Because of transmitter double buffering, there may be one character in
the serial shifter as a new character is written into the transmit data
register. In cases such as downloading in which this 2-character pipeline
is kept full, a 2-character time delay occurs between when a character is
written to the transmit data register and when that character finishes
transmitting. A little more than one more character time delay occurs
between the target MCU receiving the character and echoing it back. If
the master MCU waits for the echo of each downloaded character before
sending the next one, the download process takes about twice as long
as it would if transmission is treated as a separate process or if verify
data is ignored.
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Boot ROM Variations
Different versions of the M68HC11 have different versions of the
bootstrap ROM program. Table 3 summarizes the features of the boot
ROMs in 16 members of the M68HC11 Family.
The boot ROMs for the MC68HC11F1, the MC68HC711K4, and the
MC68HC11K4 allow additional choices of baud rates for bootloader
communications. For the three new baud rates, the first character used
to determine the baud rate is not $FF as it was in earlier M68HC11s. The
intercharacter delay that terminates the variable-length download is also
different for these new baud rates. Table 3 shows the synchronization
characters, delay times, and baud rates as they relate to E-clock
frequency.
Commented Boot ROM Listing
Listing 3. MC68HC711E9 Bootloader ROM contains a complete
commented listing of the boot ROM program in the MC68HC711E9
version of the M68HC11. Other versions can be found in Appendix B of
the M68HC11 Reference Manual and in the freeware area of the
Motorola Web site.
Table 3. Bootloader Baud Rates
Baud Rates at E Clock =
Sync
Character
Timeout
Delay
2 MHz 2.1 MHz 3 MHz 3.15 MHz 4 MHz 4.2 MHz
$FF
$FF
$F0
$FD
$FD
4 characters
4 characters
7812
1200
8192 11,718 12,288 15,624 16,838
1260 1800 1890 2400 2520
4.9 characters 9600 10,080 14,400 15,120 19,200 20,160
17.3 characters 5208
13 characters 3906
5461
4096
7812
5859
8192
6144
10,416 10,922
7812 8192
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Listing 3. MC68HC711E9 Bootloader ROM
1
2
3
4
****************************************************
* BOOTLOADER FIRMWARE FOR 68HC711E9 - 21 Aug 89
****************************************************
* Features of this bootloader are...
*
5
6
7
8
9
10
11
* Auto baud select between 7812.5 and 1200 (8 MHz)
* 0 - 512 byte variable length download
* Jump to EEPROM at $B600 if 1st download byte = $00
* PROGRAM - Utility subroutine to program EPROM
* UPLOAD - Utility subroutine to dump memory to host
* Mask I.D. at $BFD4 = $71E9
12
13
****************************************************
* Revision A -
14
*
15
16
17
* Fixed bug in PROGRAM routine where the first byte
* programmed into the EPROM was not transmitted for
* verify.
18
19
20
* Also added to PROGRAM routine a skip of bytes
* which were already programmed to the value desired.
*
21
22
23
24
* This new version allows variable length download
* by quitting reception of characters when an idle
* of at least four character times occurs
*
25
****************************************************
26
27
28
* EQUATES FOR USE WITH INDEX OFFSET = $1000
*
29 0008
30 000E
31 0016
32 0023
33
PORTD
TCNT
TOC1
EQU
EQU
EQU
EQU
$08
$0E
$16
$23
TFLG1
* BIT EQUATES FOR TFLG1
34 0080
35
OC1F
*
EQU
$80
36 0028
37 002B
38 002D
39 002E
40 002F
41 003B
42
SPCR
BAUD
SCCR2
SCSR
SCDAT
PPROG
EQU
EQU
EQU
EQU
EQU
EQU
$28
$2B
$2D
$2E
$2F
$3B
(FOR DWOM BIT)
* BIT EQUATES FOR PPROG
43 0020
44 0001
45
ELAT
EPGM
*
EQU
EQU
$20
$01
46
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47
48
* MEMORY CONFIGURATION EQUATES
*
49 B600
50 B7FF
51
EEPMSTR EQU
EEPMEND EQU
*
$B600
$B7FF
Start of EEPROM
End of EEPROM
52 D000
53 FFFF
54
EPRMSTR EQU
EPRMEND EQU
*
$D000
$FFFF
Start of EPROM
End of EPROM
55 0000
56 01FF
RAMSTR
RAMEND
EQU
EQU
$0000
$01FF
57
58
59
* DELAY CONSTANTS
*
60 0DB0
61 021B
62
DELAYS
DELAYF
*
EQU
EQU
3504
539
Delay at slow baud
Delay at fast baud
63 1068
64
PROGDEL EQU
*
4200
2 ms programming delay
At 2.1 MHz
65
66
67 BF00
****************************************************
ORG $BF00
68
****************************************************
69
70
71
72
73
* Next two instructions provide a predictable place
* to call PROGRAM and UPLOAD even if the routines
* change size in future versions.
*
74 BF00 7EBF13
75 BF03
PROGRAM JMP
UPLOAD EQU
PRGROUT
*
EPROM programming utility
Upload utility
76
77
78
79
80
****************************************************
* UPLOAD - Utility subroutine to send data from
* inside the MCU to the host via the SCI interface.
* Prior to calling UPLOAD set baud rate, turn on SCI
* and set Y=first address to upload.
81
82
83
84
85
86
87
* Bootloader leaves baud set, SCI enabled, and
* Y pointing at EPROM start ($D000) so these default
* values do not have to be changed typically.
* Consecutive locations are sent via SCI in an
* infinite loop. Reset stops the upload process.
****************************************************
88 BF03 CE1000
89 BF06 18A600
90 BF09 1F2E80FC
91 BF0D A72F
92 BF0F 1808
93 BF11 20F3
94
LDX
LDAA
#$1000
0,Y
Point to internal registers
Read byte
Wait for TDRE
Send it
UPLOOP
BRCLR SCSR,X $80 *
STAA
INY
SCDAT,X
UPLOOP
BRA
Next...
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95
96
97
98
****************************************************
* PROGRAM - Utility subroutine to program EPROM.
* Prior to calling PROGRAM set baud rate, turn on SCI
* set X=2ms prog delay constant, and set Y=first
* address to program. SP must point to RAM.
99
100
101
102
103
* Bootloader leaves baud set, SCI enabled, X=4200
* and Y pointing at EPROM start ($D000) so these
* default values don't have to be changed typically.
* Delay constant in X should be equivalent to 2 ms
104
105
106
*
at 2.1 MHz X=4200; at 1 MHz X=2000.
* An external voltage source is required for EPROM
* programming.
107
108
109
* This routine uses 2 bytes of stack space
* Routine does not return. Reset to exit.
****************************************************
110 BF13
PRGROUT EQU
PSHX
LDX
*
111 BF13 3C
112 BF14 CE1000
113 BF17
Save program delay constant
Point to internal registers
#$1000
114
* Send $FF to indicate ready for program data
115
116 BF17 1F2E80FC
117 BF1B 86FF
118 BF1D A72F
119
BRCLR SCSR,X $80 *
Wait for TDRE
LDAA
STAA
#$FF
SCDAT,X
120 BF1F
WAIT1
EQU
*
121 BF1F 1F2E20FC
122 BF23 E62F
123 BF25 18E100
124 BF28 271D
125 BF2A 8620
126 BF2C A73B
127 BF2E 18E700
128 BF31 8621
129 BF33 A73B
130 BF35 32
131 BF36 33
132 BF37 37
133 BF38 36
134 BF39 E30E
135 BF3B ED16
136 BF3D 8680
137 BF3F A723
138
BRCLR SCSR,X $20 *
Wait for RDRF
Get received byte
See if already programmed
If so, skip prog cycle
Put EPROM in prog mode
LDAB
CMPB
BEQ
SCDAT,X
$0,Y
DONEIT
#ELAT
PPROG,X
0,Y
#ELAT+EPGM
PPROG,X
LDAA
STAA
STAB
LDAA
STAA
PULA
PULB
PSHB
PSHA
ADDD
STD
Write the data
Turn on prog voltage
Pull delay constant
into D-reg
But also keep delay
keep delay on stack
Delay const + present TCNT
Schedule OC1 (2ms delay)
TCNT,X
TOC1,X
#OC1F
LDAA
STAA
TFLG1,X
Clear any previous flag
139 BF41 1F2380FC
140 BF45 6F3B
141
BRCLR TFLG1,X OC1F * Wait for delay to expire
CLR
PPROG,X
Turn off prog voltage
*
142 BF47
DONEIT
EQU
*
143 BF47 1F2E80FC
144 BF4B 18A600
145 BF4E A72F
146 BF50 1808
147 BF52 20CB
148
BRCLR SCSR,X $80 *
Wait for TDRE
Read from EPROM and...
Xmit for verify
Point at next location
Back to top for next
LDAA
STAA
INY
$0,Y
SCDAT,X
BRA
WAIT1
* Loops indefinitely as long as more data sent.
149
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150
151
****************************************************
* Main bootloader starts here
152
153
****************************************************
* RESET vector points to here
154
155 BF54
BEGIN
EQU
*
156 BF54 8E01FF
157 BF57 CE1000
158 BF5A 1C2820
159 BF5D CCA20C
160 BF60 A72B
161
LDS
LDX
BSET
LDD
STAA
#RAMEND
#$1000
SPCR,X $20
#$A20C
BAUD,X
Initialize stack pntr
Point at internal regs
Select port D wire-OR mode
BAUD in A, SCCR2 in B
SCPx = ÷4, SCRx = ÷4
* Writing 1 to MSB of BAUD resets count chain
162 BF62 E72D
163 BF64 CC021B
164 BF67 ED16
165
STAB
LDD
STD
SCCR2,X
#DELAYF
TOC1,X
Rx and Tx Enabled
Delay for fast baud rate
Set as default delay
166
* Send BREAK to signal ready for download
BSET SCCR2,X $01 Set send break bit
BRSET PORTD,X $01 * Wait for RxD pin to go low
167 BF69 1C2D01
168 BF6C 1E0801FC
169 BF70 1D2D01
170 BF73
BCLR
SCCR2,X $01
Clear send break bit
171 BF73 1F2E20FC
172 BF77 A62F
173
BRCLR SCSR,X $20 *
LDAA SCDAT,X
* Data will be $00 if BREAK OR $00 received
Wait for RDRF
Read data
174 BF79 2603
175 BF7B 7EB600
176 BF7E
BNE
JMP
NOTZERO
EEPMSTR
*
Bypass JMP if not 0
Jump to EEPROM if it was 0
NOTZERO EQU
177 BF7E 81FF
178 BF80 2708
179
CMPA
BEQ
#$FF
BAUDOK
$FF will be seen as $FF
If baud was correct
* Or else change to ÷104 (÷13 & ÷8) 1200 @ 2MHZ
180 BF82 1C2B33
181 BF85 CC0DB0
182 BF88 ED16
183 BF8A
184 BF8A 18CE0000
185
BSET
LDD
STD
EQU
LDY
BAUD,X $33
#DELAYS
TOC1,X
*
Works because $22 -> $33
And switch to slower...
delay constant
BAUDOK
#RAMSTR
Point at start of RAM
186 BF8E
187 BF8E EC16
188 BF90
WAIT
EQU
LDD
EQU
*
TOC1,X
*
Move delay constant to D
WTLOOP
189 BF90 1E2E2007
190 BF94 8F
191 BF95 09
192 BF96 8F
193 BF97 26F7
194 BF99 200F
195
BRSET SCSR,X $20 NEWONE Exit loop if RDRF set
XGDX
DEX
Swap delay count to X
Decrement count
XGDX
BNE
BRA
Swap back to D
Loop if not timed out
Quit download on timeout
WTLOOP
STAR
196 BF9B
NEWONE
EQU
*
197 BF9B A62F
198 BF9D 18A700
199 BFA0 A72F
200 BFA2 1808
201 BFA4 188C0200
202 BFA8 26E4
LDAA
STAA
STAA
INY
CPY
BNE
SCDAT,X
$00,Y
SCDAT,X
Get received data
Store to next RAM location
Transmit it for handshake
Point at next RAM location
See if past end
#RAMEND+1
WAIT
If not, Get another
AN1060 — Rev. 1.0
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Application Note
203
204 BFAA
STAR
EQU
LDX
LDY
JMP
*
205 BFAA CE1068
206 BFAD 18CED000
207 BFB1 7E0000
208 BFB4
#PROGDEL
#EPRMSTR
RAMSTR
Init X with programming delay
Init Y with EPROM start addr
** EXIT to start of RAM **
209
210
****************************************************
* Block fill unused bytes with zeros
211
212 BFB4 000000000000
000000000000
000000000000
000000000000
0000000000
BSZ
$BFD1-*
213
214
215
****************************************************
* Boot ROM revision level in ASCII
216
217 BFD1 41
218
*
(ORG
FCC
$BFD1)
"A"
****************************************************
* Mask set I.D. ($0000 FOR EPROM PARTS)
219
220
*
(ORG
FDB
$BFD2)
$0000
221 BFD2 0000
222
223
****************************************************
* '711E9 I.D. - Can be used to determine MCU type
224
*
(ORG
FDB
$BFD4)
$71E9
225 BFD4 71E9
226
227
228
****************************************************
* VECTORS - point to RAM for pseudo-vector JUMPs
229
230 BFD6 00C4
231 BFD8 00C7
232 BFDA 00CA
233 BFDC 00CD
234 BFDE 00D0
235 BFE0 00D3
236 BFE2 00D6
237 BFE4 00D9
238 BFE6 00DC
239 BFE8 00DF
240 BFEA 00E2
241 BFEC 00E5
242 BFEE 00E8
243 BFF0 00EB
244 BFF2 00EE
245 BFF4 00F1
246 BFF6 00F4
247 BFF8 00F7
248 BFFA 00FA
249 BFFC 00FD
250 BFFE BF54
251 C000
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
FDB
END
$100-60
$100-57
$100-54
$100-51
$100-48
$100-45
$100-42
$100-39
$100-36
$100-33
$100-30
$100-27
$100-24
$100-21
$100-18
$100-15
$100-12
$100-9
SCI
SPI
PULSE ACCUM INPUT EDGE
PULSE ACCUM OVERFLOW
TIMER OVERFLOW
TIMER OUTPUT COMPARE 5
TIMER OUTPUT COMPARE 4
TIMER OUTPUT COMPARE 3
TIMER OUTPUT COMPARE 2
TIMER OUTPUT COMPARE 1
TIMER INPUT CAPTURE 3
TIMER INPUT CAPTURE 2
TIMER INPUT CAPTURE 1
REAL TIME INT
IRQ
XIRQ
SWI
ILLEGAL OP-CODE
COP FAIL
CLOCK MONITOR
RESET
$100-6
$100-3
BEGIN
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Application Note
Symbol Table:
Symbol Name
Value Def.# Line Number Cross Reference
BAUD
002B *00037 00160 00180
BF8A *00183 00178
BF54 *00155 00250
021B *00061 00163
0DB0 *00060 00181
BF47 *00142 00124
B7FF *00050
B600 *00049 00175
0020 *00043 00125 00128
0001 *00044 00128
BAUDOK
BEGIN
DELAYF
DELAYS
DONEIT
EEPMEND
EEPMSTR
ELAT
EPGM
EPRMEND
EPRMSTR
NEWONE
NOTZERO
OC1F
PORTD
PPROG
PRGROUT
PROGDEL
PROGRAM
RAMEND
RAMSTR
SCCR2
SCDAT
SCSR
FFFF *00053
D000 *00052 00206
BF9B *00196 00189
BF7E *00176 00174
0080 *00034 00136 00139
0008 *00029 00168
003B *00041 00126 00129 00140
BF13 *00110 00074
1068 *00063 00205
BF00 *00074
01FF *00056 00156 00201
0000 *00055 00184 00207
002D *00038 00162 00167 00169
002F *00040 00091 00118 00122 00145 00172 00197 00199
002E *00039 00090 00116 00121 00143 00171 00189
0028 *00036 00158
SPCR
STAR
BFAA *00204 00194
TCNT
000E *00030 00134
TFLG1
TOC1
UPLOAD
UPLOOP
WAIT
0023 *00032 00137 00139
0016 *00031 00135 00164 00182 00187
BF03 *00075
BF06 *00089 00093
BF8E *00186 00202
WAIT1
WTLOOP
BF1F *00120 00147
BF90 *00188 00193
Errors: None
Labels: 35
Last Program Address: $BFFF
Last Storage Address: $0000
Program Bytes: $0100 256
Storage Bytes: $0000
0
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Motorola Semiconductor Engineering Bulletin
EB184
Enabling the Security Feature on the MC68HC711E9
Devices with PCbug11 on the M68HC711E9PGMR
By Edgar Saenz
Austin, Texas
Introduction
The PCbug11 software, needed along with the M68HC711E9PGMR to
program MC68HC711E9 devices, is available from the download
section of the Microcontroller Worldwide Web site
http://www.motorola.com/semiconductors/.
Retrieve the file pcbug342.exe (a self-extracting archive) from the
MCU11 directory.
Some Motorola evaluation board products also are shipped with
PCbug11.
NOTE: For specific information about any of the PCbug11 commands, see the
appropriate sections in the PCbug11 User's Manual (part number
M68PCBUG11/D2), which is available from the Motorola Literature
Distribution Center, as well as the Worldwide Web at
http://www.motorola.com/semiconductors/. The file is also on the
software download system and is called pcbug11.pdf.
© Motorola, Inc., 1998
EB184
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Engineering Bulletin
To Execute the Program
Use this step-by-step procedure to program the MC68HC711E9 device.
Step 1
•
Before applying power to the programming board, connect the
M68HC711E9PGMR serial port P2 to one of your PC COM ports
with a standard 25-pin RS-232 cable. Do not use a null modem
cable or adapter which swaps the transmit and receive signals
between the connectors at each end of the cable.
•
•
Place the MC68HC711E9 part in the PLCC socket on your board.
Insert the part upside down with the notched corner pointing
toward the red power LED.
•
•
Make sure both S1 and S2 switches are turned off.
Apply +5 volts to +5-V, +12 volts (at most +12.5 volts) to V , and
PP
ground to GND on your programmer board’s power connector, P1.
The remaining TXD/PD1 and RXD/PD0 connections are not used
in this procedure. They are for gang programming MC68HC711E9
devices, which is discussed in the M68HC711E9PGMR Manual.
You cannot gang program with PCbug11.
•
Ensure that the "remove for multi-programming" jumper, J1, below
the +5-V power switch has a fabricated jumper installed.
Step 2
Apply power to the programmer board by moving the +5-V switch to the
ON position. From a DOS command line prompt, start PCbug11this way:
C:\PCBUG11\ > PCBUG11 –E PORT = 1
with the E9PGMR connected to COM1
or
C:\PCBUG11\ > PCBUG11 –E PORT = 2
with the E9PGMR connected to COM2
PCbug11 only supports COM ports 1 and 2. If the proper connections
are made and you have a high-quality cable, you should quickly get a
EB184
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PCbug11 command prompt. If you do receive a Comms fault error,
check the cable and board connections. Most PCbug11 communications
problems can be traced to poorly made cables or bad board
connections.
Step 3
Step 4
PCbug11 defaults to base 10 for its input parameters.
Change this to hexadecimal by typing: CONTROL BASE HEX.
Clear the block protect register (BPROT) to allow programming of the
MC68HC711E9 EEPROM.
At the PCbug11 command prompt, type: MS 1035 00.
Step 5
The CONFIG register defaults to hexadecimal 103F on the
MC68HC711E9. PCBUG11 needs adressing parameters to allow
programming of a specific block of memory so the following parameter
must be given.
At the PCbug11 command prompt, type: EEPROM 0.
Then type: EEPROM 103F 103F.
Step 6
Step 7
Erase the CONFIG to allow byte programming.
At the PCbug11 command prompt, type: EEPROM ERASE BULK 103F.
You are now ready to download the program into the EEPROM and
EPROM.
At the PCbug11command prompt, type:
LOADSC:\MYPROG\MYPROG.S19.
For more details on programming the EPROM, read the engineering
bulletin Programming MC68HC711E9 Devices with PCbug11 and the
M68HC11EVB, Motorola document number EB187.
EB184
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Step 8
You are now ready to enable the security feature on the MCHC711E9.
At the PCbug11 command prompt type: MS 103F 05.
Step 9
Step 10
After the programming operation is complete, verifyng the CONFIG on
the MCHC711E9 is not possible because in bootstrap mode the default
value is always forced.
The part is now in secure mode and whatever code you loaded into
EEPROM will be erased if you tried to bring the microcontroller up in
either expanded mode or bootstrap mode.
NOTE: It is important to note that the microcontroller will work properly in secure
mode only in single chip mode.
NOTE: If the part is placed in bootstrap or expanded, the code in EEPROM and
RAM will be erased and the microcontroller cannot be reused. The
security software will constantly read the NOSEC bit and lock the part.
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EB188
Enabling the Security Feature on M68HC811E2 Devices
with PCbug11 on the M68HC711E9PGMR
By Edgar Saenz
Austin, Texas
Introduction
The PCbug11 software, needed along with the M68HC711E9PGMR to
program MC68HC811E2 devices, is available from the download
section of the Microcontroller Worldwide Web site
http://www.motorola.com/semiconductors/.
Retrieve the file pcbug342.exe (a self-extracting archive) from the
MCU11 directory.
Some Motorola evaluation board products also are shipped with
PCbug11.
NOTE: For specific information about any of the PCbug11 commands, see the
appropriate sections in the PCbug11 User's Manual (part number
M68PCBUG11/D2), which is available from the Motorola Literature
Distribution Center, as well as the Worldwide Web at
http://www.motorola.com/semiconductors/. The file is also on the
software download system and is called pcbug11.pdf.
© Motorola, Inc., 1998
EB188
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Engineering Bulletin
To Execute the Program
Once you have obtained PCbug11, use this step-by-step procedure.
Step 1
•
Before applying power to the programming board, connect the
M68HC711E9PGMR serial port P2 to one of your PC COM ports
with a standard 25 pin RS-232 cable. Do not use a null modem
cable or adapter which swaps the transmit and receive signals
between the connectors at each end of the cable.
•
•
Place your MC68HC811E2 part in the PLCC socket on your
board.
Insert the part upside down with the notched corner pointing
toward the red power LED.
•
•
Make sure both S1 and S2 switches are turned off.
Apply +5 volts to +5 volts and ground to GND on the programmer
board’s power connector, P1. Applying voltage to the V pin is
PP
not necessary.
Step 2
Apply power to the programmer board by moving the +5-volt switch to
the ON position.
From a DOS command line prompt, start PCbug11 this way:
•
•
C:\PCBUG11\> PCBUG11 –A PORT = 1
when the E9PGMR connected to COM1 or
C:\PCBUG11\> PCBUG11 –A PORT = 2
when the E9PGMR connected to COM2
PCbug11only supports COM ports 1 and 2.
Step 3
PCbug11 defaults to base ten for its input parameters.
Change this to hexadecimal by typing
CONTROL BASE HEX
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Step 4
Clear the block protect register (BPROT) to allow programming of the
MC68HC811E2 EEPROM.
At the PCbug11 command prompt, type
MS 1035 00
Step 5
PCbug11 defaults to a 512-byte EEPROM array located at $B600. This
must be changed since the EEPROM is, by default, located at $F800 on
the MC68HC811E2.
At the PCbug11 command prompt, type
EEPROM 0
Then type: EEPROM F800 FFFF
EEPROM 103F 103F
This assumes you have not relocated the EEPROM by previously
reprogramming the upper 4 bits of the CONFIG register. But if you have
done this and your S records reside in an address range other than
$F800 to $FFFF, you will need to first relocate the EEPROM.
Step 6
Erase the CONFIG to allow programming of NOSEC bit (bit 3). It is also
recommended to program the EEPROM at this point before
programming the CONFIG register. Refer to the engineering bulletin
Programming MC68HC811E2 Devices with PCbug11 and the
M68HC711E9PGMR, Motorola document number EB184.
At the PCbug11command prompt, type
EEPROM ERASE BULK 103F
EB188
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Step 7
You are now ready to enable the security feature on the MCHC811E2.
At the PCbug11 command prompt, type
MS 103F 05
The value $05 assumes the EEPROM is to be mapped from $0800 to
$0FFF.
Step 8
Step 9
After the programming operation is complete, verifying the CONFIG on
the MCHC811E2 is not possible because in bootstrap mode the default
value is always forced.
The part is now in secure mode and whatever code you loaded into
EEPROM will be erased if you tried to bring the microcontroller up in
either expanded mode or bootstrap mode. The microcontroller will work
properly in the secure mode only in single chip mode.
NOTE: If the part is placed in bootstrap mode or expanded mode, the code in
EEPROM and RAM will be erased the microcontroller can be reused.
EB188
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EB296
Programming MC68HC711E9 Devices with PCbug11
and the M68HC11EVBU
By John Bodnar
Austin, Texas
Introduction
The PCbug1software, needed along with the M68HC11EVBU to
program MC68HC711E9 devices, is available from the download
section of the Microcontroller Worldwide Web site
http://www.motorola.com/semiconductors/.
Retrieve the file pcbug342.exe (a self-extracting archive) from the
MCU11 directory.
Some Motorola evaluation board products also are shipped with
PCbug11.
For specific information about any of the PCbug11 commands, see the
appropriate sections in the PCbug11 User's Manual (part number
M68PCBUG11/D2), which is available from the Motorola Literature
Distribution Center, as well as the Worldwide Web at
http://www.motorola.com/semiconductors/. The file is also on the
software download system and is called pcbug11.pdf.
© Motorola, Inc., 1998
EB296
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Engineering Bulletin
Programming Procedure
Once you have obtained PCbug11, use this step-by-step procedure to
program your MC68HC711E9 part.
Step 1
•
•
Before applying power to the EVBU, remove the jumper from J7
and place it across J3 to ground the MODB pin.
Place a jumper across J4 to ground the MODA pin. This will force
the EVBU into special bootstrap mode on power up.
•
•
Remove the resident MC68HC11E9 MCU from the EVBU.
Place your MC68HC711E9 in the open socket with the notched
corner of the part aligned with the notch on the PLCC socket.
•
Connect the EVBU to one of your PC COM ports. Apply +5 volts
to V and ground to GND on the power connector of your EVBU.
DD
Also take note of P4 connector pin 18. In step 5, you will connect a +12-
volt (at most +12.5 volts) programming voltage through a 100-Ω current
limiting resistor to the XIRQ pin. Do not connect this programming
voltage until you are instructed to do so in step 5.
Step 2
•
From a DOS command line prompt, start PCbug11 with
– C:\PCBUG11\> PCBUG11 –E PORT = 1
with the EVBU connected to COM1
– C:\PCBUG11\> PCBUG11 –E PORT = 2
with the EVBU connected to COM2
PCbug11 only supports COM ports 1 and 2. If you have made the
proper connections and have a high quality cable, you should
quickly get a PCbug11 command prompt. If you do receive a
Comms fault error, check your cable and board connections.
Most PCbug11 communications problems can be traced to poorly
made cables or bad board connections.
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Step 3
Step 4
Step 5
•
•
PCbug11 defaults to base 10 for its input parameters; change this
to hexadecimal by typing
CONTROL BASE HEX
You must declare the addresses of the EPROM array to PCbug11.
To do this, type
EPROM D000 FFFF
You are now ready to download your program into the EPROM.
•
•
Connect +12 volts (at most +12.5 volts) through a 100-Ω current
limiting resistor to P4 connector pin 18, the XIRQ* pin.
At the PCbug11 command prompt type
LOADS C:\MYPROG\ISHERE.S19
Substitute the name of your program into the command above.
Use a full path name if your program is not located in the same
directory as PCbug11.
Step 8
After the programming operation is complete, PCbug11 will display this
message
Total bytes loaded: $xxxx
Total bytes programmed: $yyyy
•
You should now remove the programming voltage from P4
connector pin 18, the XIRQ* pin.
Each ORG directive in your assembly language source will cause
a pair of these lines to be generated. For this operation, $yyyy will
be incremented by the size of each block of code programmed
into the EPROM of the MC68HC711E9.
EB296
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•
PCbug11 will display the above message whether or not the
programming operation was successful. As a precaution, you
should have PCbug11 verify your code.
At the PCbug11 command prompt type
VERF C:\MYPROG\ISHERE.S19
Substitute the name of your program into the command above.
Use a full path name if your program is not located in the same
directory as PCbug11.
If the verify operation fails, a list of addresses which did not
program correctly is displayed. Should this occur, you probably
need to erase your part more completely. To do so, allow the
MC68HC711E9 to sit for at least 45 minutes under an ultraviolet
light source. Attempt the programming operation again. If you
have purchased devices in plastic packages (one-time
programmable parts), you will need to try again with a new,
unprogrammed device.
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Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty,
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© Motorola Inc. 2003
M68HC11E/D
Rev. 5
6/2003
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相关型号:
MC68HC711E9FN
Microcontroller, 8-Bit, OTPROM, 6800 CPU, 3MHz, CMOS, PQCC52, PLASTIC, LCC-52
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