基于单片机的交通信号灯控制系统设计.doc

目　录 中文摘要·····································································································Ⅰ 1. 引言········································································································1 2. 设计任务及思路························································································1 3. 单片机·····································································································3 3.1 单片机简介·····························································································3 3.2 单片机基本结构 ·····················································································3 3.3 单片机硬件特性 ·····················································································3 4. 芯片的选择······························································································4 4.1 74LS373以及74LS07芯片简介···································································4 4.2 8255芯片·······························································································5 4.2.1 8255可编程并行接口芯片简介·······························································5 4.2.2 8255可编程并行接口芯片方式控制字格式说明·········································5 4.3 晶闸管···································································································7 5. 交通灯控制原理分析及方案论证·································································8 6. 系统硬件设计···························································································9 6.1 总体设计································································································9 6.2 单片机最小系统······················································································9 6.2.1 振荡电路·····························································································9 6.2.2 复位电路···························································································10 6.3 显示及其驱动模块·················································································11 6.