89s51 MCU control of the keyboard and led system, the keyboard to send a few led...

功能强大的串口程序，用avr系列的mega16单片机实现-powerful Serial procedures used avr series mega16 MCU

rtx51操作系统说明-rtx51 OS

51单片机的电子琴C程序有自动演奏和键盘演奏功能-51 Microcontroller, the flower C program for automatic playing and keyboard performance features

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?

ARMMP3 ARMMP3 ARMMP3-ARMMP3 ARMMP3 ARMMP3 ARMMP3

S3C2410 PCB LAYOUT的一些技巧-S3C2410 PCB LAYOUT some skills

STCS89C51单片机的介绍，给热爱STCS89C51的朋友提供一个参考资料。-SCM STCS89C51 introduction to the love of friends STCS89C51 to provide a reference.

单片机IAP编程源程序,可直接使用,适用于嵌入式系统的智能学习功能-Singlechip IAP programming source code can be used directly applicable to embedded systems intelligent learning function

DS18B20的管脚定义：1、GND 2、DQ 3、VCC 温度显示用四位，当温度>=100度时，第四位才显示-DS18B20 pin definition: 1, GND 2, DQ 3, VCC temperature display with four, when the temperature

C8051F系列单片机SPI端口驱动程序，简洁，高效。-C8051F MCU SPI port drivers, simple and efficient.