串口的用法，proteus仿真，程序，原理图全套。

按键扫描,有很多系统都用到按键控制操作,按键扫描功能的程序是不可小的.-Buttons to scan, there are many systems used to control the operation buttons, button scanning procedure can not be small.

目的是让大家熟悉输入、输出端口的使用 该程序的功能是把演示板当做一个按键计数器-purpose is to let people familiar with the input, output ports using the procedures of the functional demonstration board is a key counter as

TIC24xdsp信号发生器库，解压后安装，含正弦波发生器-TIC24xdsp the signal generator, installed after extract containing sine wave generator

CSTN用IC NT7528-OTC 程序参考！-CSTN with IC NT7528-OTC procedures reference!

一个很不错的事件代码~！希望大家喜欢，多给点建议！-A very good event code ~! I hope you like it, more to the point proposal!

开发环境：FASM 功能：听过不要音箱的音乐么（当然也包括耳机之类的罗），这就是一个不要音箱也可听的音乐，怎么回事，请看源代码

（1） 有一个主持人控制开关和8路抢答按扭，当主持人允许抢答时才能进行抢答操作，并用一个数码管显示抢答选手的号码，同时其他选手不能再抢答。 （2）电路上要加个蜂鸣器的电路，当有选手抢答时蜂鸣器响一下。 （3）要有倒计时功能，开始抢答时开始倒20秒计时，用两个数码管显示，当有人抢答时停止倒计时。 2.2拓展部分 用按键可设置倒计时的时间，范围在5秒到30秒之间。-(1) has a host switch and 8-way control button to answer in, when the moderator allowed to be carried out to answer in time to answer in operation, and use an LED display to answer in the number of players, while other players can no longer answer in his place. (2) the circuit, we should add a buzzer circuit, when there are players when the buzzer rang to answer in about. (3) to have the countdown feature to begin to answer in 20 seconds when you start down time, using two digital tube display, when someone stops to answer in the countdown. 2.2 The expansion of part of the buttons can be set with the countdown time, the range of 5 seconds to 30 seconds.

编写一个自定义INT 79H的中断服务程序-prepared an INT 79H from the definition of a break in service procedures

一种很好的用单片机控制步进电机的程序，用汇编语言编写。-A good use of single-chip stepper motor control procedures, with the compilation of languages.

利用DS18B20温度传感器+AT89C51控制直流电机转速，-The use of DS18B20 temperature sensor+ AT89C51 control DC motor speed,