定时闹钟原代码，用汇编语言编写 我用PROTEUS仿真过的 很成功

使用单片机AT89C51实现数字时钟功能，可以通过按键设定时、分、秒-Digital clock using microcontroller AT89C51 function keys can be set hours, minutes, seconds

用keil写的简单的适用于at89c51单片机的简易闹钟。支持时分秒功能。有一个可定时间的闹钟。-Keil wrote with a simple microcontroller for at89c51 simple alarm clock. Supported by minutes and seconds functions. One can set the time clock.