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4_2
- 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,即最后一位显示1 秒,一直循环下去 设时钟频率为12M-Dynamic scanning method and a digital timer control of the top three shows a stopwatch, accurate to 1 of the second and final one showed 1 of the second, has been set clock cycle con