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 lig