Functional requirements: must adopt. When K0 first time, allowing the use of K1 and K2 on the single-digit increase or decrease, press the first K0 second time, allowing the use of K1 and K2 on the ten-digit increase or decrease, that K0 in the bit and 10 to switch between, K1 and K2 two digital control buttons to add and subtract, with K3 to confirm the digital tube automatically after a count. The count range is displayed in cycles 00 to 59, and the buzzer beeps three times each time the counter reaches 00.

时钟2
.....\123.hex
.....\123.M51
.....\123.plg
.....\STARTUP.A51
.....\STARTUP.lst
.....\实验六键盘与显示.PWI
.....\时钟.c
.....\时钟.PWI
.....\123.lnp
.....\123.build_log.htm
.....\123_Uv2.Bak
.....\123_Opt.Bak
.....\时钟.LST
.....\时钟.OBJ
.....\123
.....\123.Uv2
.....\123.Opt
.....\Last Loaded 时钟.DBK
.....\时钟.DSN
.....\可调定时器C51.doc

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