这个程序是基于有MMC下的SPI接口驱动程序源代码

L297+L298控制步进电机，用proteus进行仿真-L297+ L298 stepper motor control, using Proteus simulation

WEIGANG-ID卡读卡头数据传输协议,在门禁,停车场系统中大量使用-WEIGANG-ID card reader first data transmission agreement, the doors, garage extensive use of System

TLC2543实时时钟芯片的读取程序，采用AVR单片机读取，并附上芯片的Datasheet。-TLC2543 real-time clock chip reader, using AVR read, accompanied Chip Datasheet.

如何在硬件条件允许的情况下在C语言中使用双数据指针提高程序的执行效率,文章还给出了例子程序.-How to hardware conditions permit in the C language using a dual data pointers improve efficiency in the implementation process, the article also gives examples of the procedure.

Atmel Uart C51程序（主方式）-Uart (the main mode)

本程序是一个简单的流水灯程序,对初学者来说是很容易掌握的,特别是对C51的初学者!--A simple water light program. It is easy to understand for beginners, especially who are learning C51.

超声波测距 利用 送接受的时间 差计算得到距离-Ultrasonic Ranging acceptable use to send the time difference calculated by the distance

经过测试成功的PDIUSBD12与Mega8的连接代码，如有需要，可以下载，从PDISUBD12与S51单片机连接代码修改而来-PDIUSBD12 tested success Mega8 connection with the code, if necessary, can be downloaded from PDISUBD12 connection with the S51 code changes from single-chip microcomputer

16*2液晶显示驱动程序，包含字符输出和字符串输出函数，可直接使用-16* 2 LCD driver output and the string contains the character output function can be used directly

课程设计做的基本程序，可实现串口通信，定时，键盘扫描等功能！-Curriculum design to do the basic procedures can realize serial communication, timing, keyboard scanning and other functions!