This paper utilizes the forward (AINO) and reverse (AINI) input functions of precise analog comparator~ within the monolithic Com~puter AT89C2051,and adds a few peripheral elements to achieve analogue-digital~ conversion.

• 利用AT89C2 0 5 1单片机内部精确模拟比较器的正向输入 (AIN0 )和反向输入 (AIN1 ) ,加以少量的外围元件实现模数转换