这是一个数字秒表的设计。几时周期为0.01s-1h。带有计数器的清零端，还有一个秒表的计时起止控制开关，最后计时信息显示在数码管上。-This is a digital stopwatch design. When a period of 0.01s-1h. Cleared with the end of the counter, and a stopwatch start and end time-control switch, th