80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz80C51的8位单片机系列4K / 8K / 16K / 32K ROM / OTP 128B / 256B RAM的低电压2.7〜5.5 V,低功耗,高速30/33兆赫