基于AT89C52的单片机4X4键盘原理图，可用于小系统板

该程序是个蜂鸣器的调试程序，歌曲是兰花草-The program is a debug procedures buzzer, songs are兰花草

本文详细介绍了4×4矩阵式键盘识别技术，内含详细的电路图和C51源代码。-This paper describes a 4 × 4 matrix keyboard recognition technology, and contains detailed schematics and source code C51.

at89c2051制作的超声波测距源程序，经本人检测程序无误，测距精度在10CM以内-AT89C2051 Ultrasonic Ranging source produced by the testing procedures I correct location accuracy within 10CM

超声波测距的源代码，已以SPCE61上调试通过。-Ultrasonic Distance Measurement of source code, has been adopted SPCE61 debugging.

8051两个单片机的通信，各自分别控制另一个单片机的跑马灯的左右跑动方向。keic工程文件-8051 2 MCU communication, each one separately control the left and right SCM ticker running direction. keic project file

12864中文字库测试程序 ST7920-12864 Chinese font ST7920 test procedure

LPC2378 LCD演示工程源代码，希望大家喜欢-LPC2378 LCD demo project source code, I hope everyone likes

有关网络接口芯片RTL8019As论文，有助于这方面的开放-The network interface chip RTL8019As papers, help in this regard open

IAR例子，里面是一个完整的定时例子。包含Proteus电路图。-IAR example, which is a complete example of the timing. Include Proteus schematic.

C51的45D驱动程序-C51 45D Driver