秒表有两个功能按钮：一个是计数和停止计数按钮，当第一次按下此按钮时，秒表开始计数，再一次按下时，秒表停止计数，并显示所计的数字；另一个是清零按钮，当按下此按钮时，秒表清零。在数码管上采用动态扫描显示输出。-Stopwatch has two function buttons: one button count and stop counting when the first time you press this button, the stopwatch starts counting, when pressed again, the stopwatch stops counting, and displays the total figure　another is cleared Zero button, when this button is pressed, the stopwatch is cleared. Dynamic scan on the digital display output.