traffic lights at a crossroads right now management for traffic signal management, the driveway flashing yellow light five seconds later, the pedestrian crossings to release a minute and then released into driveway vehicles for three minutes. So the cycle to repeat. Using light-emitting diode signal simulation, 8255A right signals control (used to set the port), the 8253 regular counter to the two experimental system of the main unit there 8259A interrupt request, to achieve 3 minutes, 5 seconds and one minute timing. Experimental System to the 8253 counter two OPCLK CLK2 access, frequency of 1.19318MHZ, GATE2 has received+5 V, which combines hardware and software regularly use a combination of ways.

Packet : 903445200505060050419.rar filelist
交通灯控制电路（王金涛）.doc

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