十字路口带倒计时显示的交通红绿灯控制系统设计(28页)Good is good, but better carries it.精益求精，善益求善。目录。1 系统概述......................................................................................................................11.1 应用背景及意义.......................................................................................................11.2 设计任务...................................................................................................................11.3 设计要求...................................................................................................................12 方案论证......................................................................................................................22.1 方案比较...................................................................................................................22.2 方案选择...................................................................................................................32.3 方案设计...................................................................................................................32.4 方案时序图...............................................................................................................53. 硬件设计.....................................................................................................................63.1 I/O 分配....................................................................................................................63.2 I/O 接线图................................................................................................................73.3 元器件选型...............................................................................................................74. 软件设计.....................................................................................................................94.1 主流程.....................................................................
