C8051F040 T0 对/INT0输入信号脉宽测量例程

在微机上模拟I2C总线的设计中，用并行口的D0（PIN2）模拟SCL信号，用D1（PIN3）模拟SDA信号。根据IIC总线的电平规范 -Computer simulation on the design of I2C bus with a parallel port D0 (PIN2) Analog SCL signal, with D1 (PIN3) Analog signal SDA. According to the IIC bus specification level

非常详细的PS_2数遍与键盘协议，英文版，附有中文版对照，译者十分详细，是不可多得的PS_2协议资料-PS_2 very detailed agreement several times with the keyboard, in English, with Chinese version control, the translator is very detailed, it is rare agreement PS_2 information

在单片机和DDS专用芯片进行控制，再显示-DDS special chip in the microcontroller and control, and then display

用C51做的计算器源码，矩阵键盘，液晶显示，C和ASM混合编程，PROTUSE自带的例程-C51 calculator to do with source code, matrix keyboard, LCD, C and ASM programming mixed, PROTUSE built-in routines

ID卡读写 （51的汇编程序）-ID Card Reader (51 compilation procedure)

这是用来分析HHT的程序，极好。 gooo ooo ood-This is the procedure used to analyze HHT, excellent. gooo ooo ood

一个基于AVR单片机的通用、标准串口收、发中断程序，可移植到8/16/32的单片机上-an AVR-based generic, standard serial admission, the suspension procedure, can be transplanted into 8/16/32 on the MCU

读卡器IC卡SL4428 读写模块源代码-Reader IC card SL4428 R/W Module source code

写单片机的可以看看17种使用的小软件这是1-RUANJIAN

按键扫描 51单片机加8279 8279通过74LS 138译码器扩展4×4键盘、6位显示器。 由3-8译码器对SL0～SL2译出键扫描线，由另一3-8译码器译出显示器的位扫描线，并采用了编码扫描方式。 为了防止出现重键现象，扫描输出线高位SL3不参加键扫描译码。CPU对8279的监视采用了查询方式，故8279的中断请求信号IRQ悬空未用。 -Scan button 82,798,279 plus 51 single-chip decoder 74LS 138 through the expansion of 4 × 4 keyboard, the display 6. From 3-8 decoder SL0 ~ SL2 translated to the key scanning line, by another 3-8 decoder translated display scan line, and uses code scanning. In order to prevent the emergence of the phenomenon of re-key, scan the output line does not take part in high level SL3 scan decoding keys. CPU on the 8279 surveillance using the query mode, the 8279 interrupt request signal IRQ left unused.