我们在做一个单片机系统时，常常会遇到这样那样的数据采集，在这些被采集的数据中，大部分可以通过我们的I/O口扩展接口电路直接得到，由于51单片机大部分不带AD转换器，所以模拟量的采集就必须靠A/D或V/F实现。下现我们就来了解一下AD0809与51单片机的接口及其程序设计。-We do a single-chip system, often encounter this kind of data collection, these data were collected, most by our I/O port expansion interface circuit directly, because most of the microcontroller 51 without AD converter, the analog acquisition must rely on A/D or V/F to achieve. Now we have to understand under what AD0809 and 51 single interface and its programming.