在单片机开发板上实现的一个电子钟程序。采用了模块化的设计方法，将头文件和源文件分开来写。时间用6个数码管显示，用按键可以随时调节时钟的时，分，秒，设计了三个有效按键，分别为功能选择键，数值增大键和数值减小键。每次按下键，(蜂鸣器鸣响一次)，利用板上at24c02设计实现断电自动保护显示数据的功能，当下次上电时会接着上次断电前的时间数据继续运行。-Microcontroller development board, an electronic clock program. Uses a modular design method, the header files and source files to write separately. Time with six digital display, the button can always adjust the clock, minutes, seconds, designed three effective keys to select the function key, value increases and numerical reduce key. Each time you press the button (buzzer sounds once), use board at24c02 designed to achieve power outage automatic protection function of display data, the time data before the last power failure when the next power will then continue to run.