本文档收集并整理了许多实用的C51单片机开发程序，这些程序即可以作为参考程序，又是实际的开发程序，可以直接作为程序应用在相同的开发系统上。-This document is collected and compiled many useful C51 microcontroller development programs that can serve as a reference for the program, but also the actual development process, can be directly applied to the same as a program development system.