能准确测量输入频率，配备相应的C语言程序。

空孩子3310的程序，给需要的朋友－－－－－pcf8848-3310 children

C51串口扩展5个源代码，可以弥补51单片机串口不足的缺点，-C51 Serial Port Expansion five source code, it could make up for 51 microcontroller serial shortage of shortcomings,

在做项目（工程）的时候，我们经常要用到比较多的按键，而且IO 资源紧张， 于是我们就想方设法地在别的模块中节省IO 口，好不容易挤出一两个IO 口，却 发现仍然不够用，实在没办法了就添加一个IC 来扫键。一个IC 虽然价格不高， 但对于大批量生产而且产品利润低的厂家来说，这是一笔不菲的开支! 那，我们能不能想到比较好的扫键方法：用最少的IO 口，扫最多的键？可以吗？-Doing the project (engineering), we often use the relatively large number of keys, and the IO resource constraints, so we are trying to save in another module IO ports, finally out of one or two IO ports, only to find is still not enough there is really no other way to add an IC to sweep on the keys. Although the price of an IC is not high, but low profits, high-volume production and product manufacturers, this is spending a lot of money! That, we can not think of a better scan key method: with a minimum of IO ports, scan Most of the keys? OK?

汇编语言实现实用单片机电子钟的制作，包括时间的显示以及中断控制。-assembly language to achieve practical SCM electronic clock production, including the time of the show and interrupt control.

基于avr单片机系统硬盘mp3设计，硬盘为fat32文件系统-avr microcontroller-based digital audio system design, drives for fat32 file system

此为友善之臂micro2440板的核心板原理图，更新时间是2009年2月28日。-This is a friendly arm of the core board micro2440 board schematic, update time is February 28, 2009.

标准frescale单片机的I2C总线程序-frescale MCU standard I2C bus procedures

PIC 的资源,睡眠模式和看门狗的设置和使用的C语言样例-Using sleep mode, wakeup on change, and the watchdog timer on baseline PICs

kemi12864LCD源程序用kei uvision打开-kemi12864LCD source with open Kei uvision

avr单片机atmega8系列定时器的使用测试程序，本程序为示例程序，适用于初学者 -avr SCM timer atmega8 series of testing procedures, the procedures for sample procedures applicable to beginners