Time control in accordance with the principle, the use of parallel interface and timer, interrupt and time to design a crossroads of traffic lights management systems, access time (or the prohibition of the time) 30 seconds, three seconds preparation time, time in the preparation of yellow light flashes 3 times, blinking frequency of 0.5 seconds and again. Can be used such as interface circuits 8255,8253,8259.

4jiaotongdeng.doc

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