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目录摘要........................................................................................................................................1Abstract...................................................................................................................................2第一章选题背景..................................................................................................................31.1课题背景.................................................................................................................31.2交通灯的历史.........................................................................................................3第二章单片机简介..............................................................................................................42.1单片机的发展历程.................................................................................................42.2单片机的特点:.....................................................................................................42.3AT89C51单片机简介.............................................................................................5第三章总体设计..................................................................................................................63.1设计方案.................................................................................................................63.2具体要求.................................................................................................................7第四章硬件设计..................................................................................................................94.1电源电路.................................................................................................................94.2单片机最小系统.....................................................................................................94.3数码管显示部分....................................................................................................114.4LED交通灯系列...........................................