本系统就是充分利用了8051和8255芯片的I/O引脚。系统统采用MSC-51系列单片机Intel8051和可编程并行I/O接口芯片8255A为中心器件来设计交通灯控制器，实现了能根据实际车流量通过8031芯片的P1口设置红、绿灯燃亮时间的功能；红绿灯循环点亮，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。

-Take full advantage of this system is the 8051 and 8255 chip I/O pin. System integration using MSC-51 series single-chip programmable Intel8051 and parallel I/O interface chip 8255A-centric device designed to control traffic lights, can be achieved in accordance with the actual traffic flow through the P1 port 8031 chip set red, green fuel Liang function of time　traffic light cycle, the countdown five seconds left when the yellow light flashing warning (traffic lights through the PA output signal indicates the time directly through the PC port output 8255 to double-digits)　vehicle alarm闯红灯　green time traffic flow can be detected through a double-digital display.