Description: The first two digital tube display a decimal number, range 00- 59// 00 begin to show when each press S2 button once, the value plus 1 Each press S3 button once, the value minus 1 each Press S4 button once, the value zero every S5 key is pressed once, using the timer function enables automatic start values per second, press the S5 button again to stop automatically add a value to keep the display of the original number.
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独立键盘检测.c
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