P1.0-P1.2 north-south direction, respectively red, yellow, green P1.3- P1.5 for the east-west direction of the red, yellow, green common cathode LED of a, b, c, d, e , f, g, dp, respectively, then P0.0-P0.7 digital V0-V2 were then P2.0- P2.2 (V0 to one hundred, V1 is 10-bit, V2 is a bit) north and the south main road, can do time 180 seconds, the yellow light for 3 seconds, something for the rural road, access time of 60 seconds, yellow light for 3 seconds use T0 interrupt source, the scans showed that the digital control, T1 for the timer, each timer 0.5 seconds, two counts of 1 second.

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