The article describes the use of 89C51 microcontroller as the control center of traffic light system. The system has traffic light display, it also shows the time countdown function.

• 摘要介绍一种使用89C51单片机作为控制中心的交通灯系统，该系统具有红、绿、黄灯显示功能和显示时间倒计时功能。