89C51-based procedures and Proteus7.5 simulated countdown chart. Through the button changes the countdown time, the four digital display. Has to do Proteus7.5 simulation under the map, simulation pass.

倒计时\单片机配套原理图纸.pdf
......\Program\STARTUP.A51
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......\...teus\Last Loaded 111.DBK
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......\.......\111.PWI
......\Program
......\Proteus
倒计时

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