本程序是用汇编语言编写的，倒计时剩5秒时黄灯闪烁警示（交通灯信号通过PA口输出，显示时间直接通过8255的PC口输出至双位数码管）；车辆闯红灯报警；绿灯时间可检测车流量并可通过双位数码管显示。-This program is written in assembly language, countdown 5 seconds when the yellow light flashing warning (traffic light signal through the output port PA left, indicating the time directly through the PC port output 8255 to two digital tube)　vehicle ran a red light alarm　green time to detection of traffic flow and the double- digit code to display.