用动态扫描方法和定时器1在数码管的前三位显示出秒表，精确到1 秒，即后两位显示1 秒，一直循环下去。-With dynamic scanning method and Timer 1 in the digital control of the top three shows a stopwatch, accurate to 1 of the second, which showed 1 after two seconds, has been the cycle continues.