采用Proteus 等仿真软件设计一个秒表电路并编程实现，详细要求如下：

要求单片机驱动一个两位的LED数码管，系统带一个按键，一个蜂鸣器。正常情况下LED数码管显示初始数值00，按下一次按键，秒表开始走时，每秒更新一次时间并显示。再按下一次按键，走时停止，显示当前秒信息。再按一次，秒表清零，重新回到显示初始00值并停止。每次按键时，要求蜂鸣器响0.5秒。

-Proteus used a stopwatch and other circuit simulation software design and programming, detailed requirements are as follows: a two requirements of the LED driver chip digital control system with a button, a buzzer. Under normal circumstances LED display initial value 00, press a button, the stopwatch starts to move, time to update once per second and displayed. Then press a button, go stop, display the current second information. Press again to clear the stopwatch, back to show the initial value of 00 and stop. Each key, ask the buzzer sounds for 0.5 seconds.