一个用51单片机播放音乐的程序,附带仿真原理图.程序使用C51编写,对单个音调的播放进行了封装，可以脱离本工程独立使用.-A piece of program that could play music on MCS-51.The program is written in C51, the process of playing a single tone was packaged, which can be used independently from the project.