Write a traffic light control program, the conversion of the things the intersection with the north and south of the intersection status lights and emergency treatment. 8253 count output 1S the clock pulse, and use the 8255 interface chip to control the LED light off, while the 8279 display the countdown, keyboard control emergency processing keys, command and control systems in order to achieve the traffic lights.

交通灯指挥控制系统.docx

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