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根据MCS-51单片机无内部A/D转换器的特点，利用电压比较器及RC阻容元件设计出一种简易A/D转换器，该转换器的精度为7位，可满足低速低分辩率A/D转换应用的需要。
According to the characteristics of MCS-51 MCU without internal A / D converter, a simple A / D converter is designed by using voltage comparator and RC RC element. The accuracy of this converter is 7 bits to meet the requirements of low speed and low resolution A / D conversion application needs.