at89c52_3key_Digitaltube

代码说明：

  基于At89c52和数码管实现的秒表，具有正向计时、倒计时和清零功能，三个按键分别对应k1（开始计时、暂停、继续）、k2（倒计时、暂停、继续）、k3（停止、归零）。文件包括源码、工程文件、仿真原理图和工程文件。(Based At89c52 and implement digital stopwatch, has a positive time, countdown and clear function, three buttons corresponding to k1 (start time, pause, resume), k2 (countdown, pause, resume), k3 (stop, zero ). File contains the source code and schematics.)