1. Through the parallel port 8255A to control LED brightness light-emitting diode out. 2. A population control a red light, B I control yellow, C green population control. 3. Output of 0-liang, the output for an out. 4. Using 8253 to control the transformation of time from time to time.

Packet : 17869305thecontroloftrafficlights.rar filelist
The control of traffic lights.doc

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