单片机89c51按键控制蜂鸣器分别发出a r m f si li xi的音阶,献给刚学单片机的朋友...

（1）频率测试功能：测频范围0.1H~200H。 测试精度：恒为百万分之一。 （2）脉宽测试功能：范围0.1us~1s，精度0.01us。 （3）占空比测试功能。-(1) the frequency of test functions: the scope of testing frequency 0.1H ~ 200H. Test accuracy: Constant for the parts per million. (2) pulse-width test functions: the scope of 0.1us ~ 1s, the accuracy of 0.01us. (3) duty cycle testing.

嵌入式系统下的键盘驱动程序。可识别三种类型的键盘动作：按下，抬起，一直按住。加入了去抖动的处理。文档附有，详细的原理说明，和简要的设计思想。该键盘驱动可适用于arm和dsp.-Embedded system under the keyboard driver. Identifies three types of keyboard actions: pressing, lifting, has been holding down the. Added to deal with jitter. Document with a detailed description of the principle, and briefly the design idea. The keyboard-driven applied to arm and dsp.

uboot移植文档 1.2 2009 skyey模拟-uboot 1.2 2009

一个电子表程序，keil c 开发！有显示，时间，ii2c等功能，希望对大家有帮助！-An electronic spreadsheet programs, keil c development! Have shown that time, ii2c and other functions, and they hope to have everyone help!

ST7920液晶控制器的AVR程序，有反白程序。图片显示程序等等。代码很精简，用串行方式传输，只需要三根控制线就可以了。-ST7920 LCD controller AVR procedures, anti-white programs. Image display program and so on. Code is very simple to use serial transmission, only three control lines on it.

利用单片机的串行通信的实现是很困难，这忙乱的任务，可使用此源代码为通信发生在一种很舒服的方式可以轻松地。

header file of the specific codes for LPC2100 target boards -header file of the specific codes for LPC21 00 target boards

C8051F020 东软电力载波集中器命令处理程序-C8051F020 Neusoft Power Line Carrier for order processing

ARM9200+嵌入式linux下的lcd驱动-ARM9200+ Embedded lcd driver under linux

用ADS1.2做的S3C44B0的bios，功能比较齐全，是学习ARM启动初始化的好资源！-ADS1.2 to do with the S3C44B0