A timer. The use of C51/52 chip, Protues simulation, and the HEX file available test. When the power is turned on for 0 minutes and 0 seconds 0. There are four key a key is suspended, the other three per click increased 1 hours /1 minutes/seconds.

basic clock
...........\clock.hex.DSN
...........\clock.hex.PWI
...........\clock.plg
...........\clock.PWI
...........\STARTUP.A51
...........\STARTUP.LST
...........\STARTUP.OBJ
...........\SZZ
...........\SZZ.hex
...........\SZZ.lnp
...........\SZZ.LST
...........\SZZ.M51
...........\SZZ.OBJ
...........\SZZ.plg
...........\SZZ.uvopt
...........\SZZ.uvproj
...........\SZZ_uvopt.bak
...........\SZZ_uvproj.bak

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