这是对51单片机RAM的扩展的程序 内有电路图，非常详细的注释...

在51等单片机中使用PC键盘的源码-in 51 other microprocessor using a PC keyboard FOSS

这是一个系列的单片机实验例子，有流水灯、数码管显示、行列式键盘、串口通信、系统功能等内容，是单片机初学者的最佳学习内容

C51单片机学习的好实例，好好学习哟，-C51 single-chip learning good examples to learn yo,呵呵呵~ ~ ~ ~

芯片PCF8951共有四个A/D输入通道：AD0，AD1，AD2，AD3,分别与四个电位器(R1,R2,R3,R4)连接，用以调节电位器的输出电压。其中AD0通道既可测量电位器输出电压，也可用于测量从J1插座输入的外接电压，须用开关J2加以选择。J4插座提供由PCF8591输出的时钟方波信号。SAA1064驱动四个数码管显示一路AD转换后得到的数据。-PCF8951 chip, there are four A/D input channels: AD0, AD1, AD2, AD3, respectively, with four potentiometers (R1, R2, R3, R4) connected to regulate the output voltage potential. AD0 channel which can be measured potentiometer output voltage can also be used to measure the input from the J1 socket external voltage, to be used to select switch J2. J4 socket output from the PCF8591 clock square wave signal. SAA1064 drivers of four digital display along after AD conversion data.

我同事做的一个CS5522的51单片机的驱动,用的是89S52,开发环境是KEIL C-my colleagues do a CS5522 51 MCU-driven, with the 89S52. Development environment is KEIL C

数码管驱动芯片用键盘驱动，有详细说明

研究所积累的资料8,大家秘密使用,千万别告诉别人!-8 Institute of accumulated data, we use a secret, please do not tell others!

飞思卡尔智能车闭环控制 18K-20K 变化-Freescale intelligent closed-loop control cars 18K-20K changes

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单片机测试开发程式，IIC与单片机通信，测试芯片，往芯片寄存器写程式-Single-chip test development program, IIC and single-chip communications, test chip, to chip registers to write programs