use STC89C52 produced a calendar, document contains drawings (Cadence- Allegro), and the entire PCB schematic source files, The tests can be used, hope for the program is to help beginners.

stc89c52_sys_time_ok
....................\MAIN.C
....................\MAIN.H

....................\SCANKEY.C
....................\SCANLED.C
....................\STC89C52.DSN
....................\TIMER.C
....................\WORKSPACE.C
....................\说明.txt

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