应用单片机设计十字路*通灯管理系统,实现控制车辆正常运转.要求使用8155作为I/O口扩展.交通灯当出现紧急情况时会全红.可以让救护车等优先通过.-Application of single-chip design at the crossroads traffic lights management system, realize the normal operation of vehicle control. Require the use of 8155 as the I/O port