单片机扩展是单片机应用的重要部分，文档主要介绍单片机的片外扩展。...

这是一个波形选择菜单，通过开发板上的按键，选择波形，幅度，频率的等各参数，然后发送给下位机。让其产生需要的波形。-This is a waveform selection menu, through the development of on-board buttons, select the waveform, amplitude, frequency and other parameters, and then sent to the next bit plane. The need to generate the waveform.

用C51编写的74HC595驱动数码管通用程序，可显示浮点数-C51 prepared using 74HC595 driver generic digital tube procedures, can display floating-point numbers

GSM通讯的C语言源程序代码，能够实际应用，需用户自行修改-GSM communications C language source code, the practical application can be user modified

用89s52,访问ZLG7290(LED数码显示)-By 89s52, visit ZLG7290 (LED digital display)

u盘开发的源代码，fat16的文件系统源码，flash接口的源码-u set the development of source code, fat16 file system source code, flash interface source

一个使用adc0809进行数据采集,采用1602液晶显示模拟电压的源程序,已经调试通过.-Adc0809 a use for data collection, using 1602 LCD analog voltage source, has been debugging through.

Dallas单片机ds89c420的详细说明和下载软件，使用串口ISP

网络服务器上实现操作系统和嵌入式协议栈的 结合，对于嵌入式的开发具有实际意义-network server operating systems and embedded protocol stack, the combination of development for embedded real meaning

这是一个51系列单片机控制加热温度的程序，使用了pid算法。-This is a 51 series single-chip microcomputer to control the heating temperature of the procedures, the use of pid algorithm.

单片机应用PS/2键盘的实例,本程序源码只供学习参考，不得应用于商业用途，如有需要请联系作者。 [注:AT89x51使用12M或11.0592M晶振,实测使用11.0592M] [Keil uV2 7.01编译运行通过 程序中没有做键盘数据的奇偶校验]-SCM application PS/2 keyboard example, the learning process only reference source, not used for commercial purposes, if necessary please contact the author. [Note : AT89x51 use 12M or 11.0592M crystal, the measured use 11.0592M] [Keil uV2 7.01 compiler running through the procedure done keyboard data parity]