MSC51与ADC0809接口。ADC0809是CMOS单片型逐次逼近型A/D转换器，具有8路模拟量输入通道，有转换起停控制，模拟输入电压范畴为0~+5V，转换时间为100us。 -MSC51 and ADC0809 interface. ADC0809 is a monolithic CMOS successive approximation type A/D converter with 8 analog input channels with conversion start-stop