以C51语言为设计语言编程实现交通灯指示功能。东西向红灯亮20秒，绿灯亮40秒；南北向红灯亮40秒，绿灯亮20秒；红绿灯之间黄灯闪烁5秒-To the C51 programming language design language traffic lights function. Something to the red light 20 seconds, the green light 40 seconds　40 seconds north and south to the red light, green light is 20 seconds　between traffic lights flashing yellow light 5 seconds