Digital stopwatch design: 4 key development board left to right S1-S4, after power is displayed at the beginning of 0.0 Start timing after use S1 button after S2 button to stop counting after S3 key time to zero the maximum timing 9.9 seconds. Timing error is less than 0.2 seconds, the display is stable. Crystal frequency: 11.0592MHz

秒表软件.c

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