Based At89c52 and implement digital stopwatch, has a positive time, countdown and clear function, three buttons corresponding to k1 (start time, pause, resume), k2 (countdown, pause, resume), k3 (stop, zero ). File contains the source code and schematics.

at89c52_3key_Digitaltube\Keil\test4
........................\....\test4.hex
........................\....\test4.lnp
........................\....\test4.M51
........................\....\test4.Opt
........................\....\test4.plg
........................\....\test4.Uv2
........................\....\test4_Opt.Bak
........................\....\test4_Uv2.Bak
........................\....\Text4.c
........................\....\Text4.LST
........................\....\Text4.OBJ
........................\Proteus Project\shumaguanfangzhen.pdsprj
........................\...............\shumaguanfangzhen.pdsprj.PC201405211826.Administrator.workspace
........................\Keil
........................\Proteus Project
at89c52_3key_Digitaltube

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