callback demo program, you can learn how to write callback functions

电话机的工作原理,有振铃电路,电话极性保护电路,还有双音多频发送接收电路-Telephone the working principle, has ringing circuit, Phone polarity protection circuit, as well as send DTMF receiver circuit

LED大屏幕显示系统的主要程序段 内包含几个主要的函数-LED large screen display system

数码管的显示操作，同时也有按键操作程序，通过单片机控制可以直接进行显示-Digital tube display operation, but also has key operating procedures, can be directly controlled through the single-chip display

带有存储器功能的数字温度计－DS1624技术应用-With memory function-DS1624 digital thermometer Technology

可用于 51系列单片机与触摸屏之间的通讯 （一般用modbus实现通讯）-design for exchange massage both mcu51 and torch pad

C8051f020单片机内部FLASH读写程序-C8051F020 single chip microcomputer to read and write procedures for internal FLASH

x9313数控电位器的驱动函数，用于程控LCD对比度，-NC Potentiometers x9313 driver function for program-controlled LCD contrast,

LT_1B msp430开发板例子程序－UART11_19200_2

单片机测速 用测频的方法测速，用于简单的环境 已调试程序-MCU speed by the method of frequency measurement speed, for a simple debugger environment has been

监控PS2的按键信息，是否有键按下是否为要监控的值。是则激活，不是则继续。-PS2 monitor key information, whether there is any key press if the point is to monitor the value. Is then activated, not continued.