利用单片机、HD7279、键盘，实现计时器、倒计时器。

C51源程序，实现IAP功能，可实现嵌入式系统的自主学习功能

mp3设计原理图 设计思想 设计思路 设计步骤 明确清晰-mp3 schematic design design design design thinking clear steps

一个使用C51编写的视频切换器的控制程序，用于16选4的视频切换-use C51 to prepare a video switcher control procedures for the April 16 elections Video Switch

一个对4X4数字键盘进行行&列扫描,获取扫描码的程序,支持符合键,串键,软件去抖.-one pair of 4x4 digital keyboard ranks scanning, access code scanning procedures, with key support and collaborate keys, software to tremble.

传感器是实现高精度的重要部分之一，电阻应变式称重传感器传感器由电阻应变片、弹性机械体、检测电路三部分组成。-Serial port is called serial interface, also known as serial communication interface, according to electrical standards and protocols to points, including RS-232-C, RS-422, RS485, USB, etc..

可用于 51系列单片机与触摸屏之间的通讯 （一般用modbus实现通讯）-design for exchange massage both mcu51 and torch pad

时钟芯片H1380控制程序，实现单片机时钟功能-Clock Chip H1380 control procedures, to achieve single-chip clock function

2051的时钟程序问题2051clk-2051 clock procedure 2051clk

编程软件可心安装使用安装过程简便一看就会大可放心使用-Kexin programming software is simple to install using the installation process will be a look can be assured the use of

键盘扫描程序 台湾义隆EMC汇编,程序后缀DT C0-C3 R0-R5 4*6键扫-keyboard Scan Taiwan Elan EMC compilation procedures suffix DT C0-C3 R0-R5 4* 6 keys sweep