本设计 的是一个交通灯控制系统，以单片机为核心，采用目前比较流行的AT89S51单片机，对十字路口交通灯电路进行了仿真制作，主要完成十字路口交通灯的红、绿、黄灯的点亮时间控制，并模拟了两道均有车辆要求通过时、一道有车辆要求通过时、以及在紧急情况下三种状态下交通灯的时间控制方式。在模拟系统中，采用了两组红、黄、绿三种发光二极管分别代表两道上的红绿灯，采用了数码管显示每种灯点亮的时间；并采用了三个按钮开关来模拟系统要求的三种状态。-The design of the design is a traffic control system, with the single chip processor as the core, use at present more popular AT89S51, intersection traffic light circuit of the production, the main intersection of complete traffic lights red, green, yellow lights lit the time control, and simulated the two way are required when a vehicle, through a vehicle, and when to pass in an emergency condition of traffic lights three time control mode. In the simulation system, using the two groups of red, yellow, and green three leds on behalf of two way traffic lights, adopted digital pipe display each light of the time　And used the three button to switch to simulate the three state of system requirements.