在51单片机上用7279芯片驱动键盘和数码管-51 SCM in 7279 with a chip-driven keyboard and digital tube

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.

rc522原厂完整资料,包括源码,工程文件-rc522 original integrity of the information, including source code, project file

本程序实现了对MOTOROLA08AS20单片机EEPROM的访问，可自动配置波特率，实现了对EEPROM的读、写和擦除操作。-This procedure MOTOROLA08AS20 realize single-chip EEPROM of the visit, can automatically configure the baud rate, to realize the EEPROM read, write and erase operations.

mc51单片机与isd1700芯片的通信程序，实现用单片机控制isd1700进行放音，录音等等功能-mc51 SCM and isd1700 chip communication procedures, using single-chip microcomputer to control isd1700 playback, sound recording function, etc.

这个软件是设置时间的程序。可以把时间设置在寄存器中保存。-The software is set up time-consuming procedures. Time settings can be saved in the register.

我自己用单片机C语言写的一个抢答器，希望对大家有用-For my own use MCU C language written in a Responder hope for all of us

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C51汇编必做试验3 -- 键盘扫描（C51最常见的应用哦）-ASM exam3-- Scan KeyBoard.

89c51的iic 读写的程序-89C51 to read and write procedures for the IIC