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本文件是一个3*4键盘扫描显示程序, 初学者往往对此类问题感到头疼, 本人特上传一个供大家参考.-This document is a 3* 4 keyboard scan showed procedures, beginners often on such issues headache, I would like for you to upload a reference.

基于无线通信模块的流程设备

51单片机矩阵键盘的设计与调试，建议使用52单片机。-51 Single-chip design of the keyboard matrix and debugging, it is recommended to use single-chip microcomputer 52.

8051 SIMULATOR GOOD WORK

基于单片机准双向I/O的键盘程序基于单片机准双向I/O的键盘程序-Based on single-chip quasi-bidirectional I/O keyboard procedures Singlechip-based quasi-two-way I/O keyboard procedures

二进制小数转为十进制BCD码的汇编程序，结果保留四位并在七段数码管上输出-decimal to binary decimal BCD compilation procedures, and results in four reservations in paragraph 107 digital output tube

=== =时钟20:6=== === == 应先初始化状态寄存器 tx1714 EQU 7FFH PA EQU 05H PB EQU 06H PC EQU 07H PD EQU 20H IAR EQU 00H 间接寻址寄存器 TMR0 EQU 01H 定时器 STATUS EQU 03H 状态寄存器 BSR EQU 04H bank选择寄存器 PORTA EQU 05H I/0端口寄存器 PORTB EQU 06H I/0端口寄存器 PORTC EQU 07H I/0端口寄存器 PORTD EQU 20H I/0端口寄存器 PULL EQU 21H PULL-High上拉寄存器 WAKEUP EQU 22H 唤醒控制寄存器－－被用来设定watchdog允许和禁止 IRQM EQU 23H 中断屏蔽寄存器 IRQF EQU 24H 中断标志寄存器 WDTSEL EQU 25H -=== === = clock 20 : 6 === === === == should first register initialization state tx1714 EQU 7FFH EQU PA PB EQU 05H 06H 07H PC EQU PD EQU 20H IAR E QU 00H indirectly addressable registers TMR0 EQU 01H timer STATUS EQU Mr send state BSR EQU-deposit bank in the 04H choice Register PORTA EQU 05H I/O ports Register P ORTB EQU 06H I/O ports Register PORTC EQU 07H I/O ports Register POR TD EQU 20H I/O ports Register PULL EQU 21H PULL-High pull Register WAKEUP EQU 22H awaken control registers-- were used to set watchdog allowed and prohi

多年工作有关PCB绘图的总结，适合初学者学习-Years of work-related summary graphics PCB, suitable for beginners to learn

直流电机转速测控，并实现语音报速，而且在LCD上显示当前设置的速度-DC motor speed measurement and control, and realize al-speed voice, but also in LCD displays current settings of the speed of

AT24C02的应用例程，进行eeprom和I2C的应用设计-AT24C02 Application routines for I2C EEPROM and Application Design