文件名称:4_2
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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 Timer 1 in the top three shows digital stopwatch, accurate to 1 of the second, that last one is displayed 1 seconds, until the cycle continues setting the clock frequency is 12M
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 Timer 1 in the top three shows digital stopwatch, accurate to 1 of the second, that last one is displayed 1 seconds, until the cycle continues setting the clock frequency is 12M
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4_2.c
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