在89C51芯片上运行，采用两个中断方式，一个外部0中断实现救护车通行，南北红灯10秒后恢复中断前状态，另一个是定时器0中断实现南北灯状态转换，16X16 LED点阵对应显示“南北”字样信息-89C51 chip in operation, interruption of the use of two methods to achieve an external 0 interrupt the passage of ambulances, the North-South red light 10 seconds after the resumption of state, and the other is the timer 0 interrupt to achieve the state of North-South light conversion, 16X16 LED dot-matrix corresponding show " South-North"　in the information