一个简单的交通灯控制器，交通灯显示用实验箱的交通灯模块来显示。系统时钟选择时钟模块的1Hz时钟，黄灯闪烁时钟为1Hz，红灯15s，黄灯5s，绿灯15s。-A simple traffic light controller, traffic lights display module test box to display the traffic lights. System clock selection 1Hz clock module clock, flashing yellow clock