目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc359772678"1绪论PAGEREF_Toc359772678\h2HYPERLINK\l"_Toc359772679"1.1背景和意义PAGEREF_Toc359772679\h2HYPERLINK\l"_Toc359772680"1.2设计要求PAGEREF_Toc359772680\h2HYPERLINK\l"_Toc359772681"1.2.1设计要求PAGEREF_Toc359772681\h2HYPERLINK\l"_Toc359772682"1.2.2主要内容PAGEREF_Toc359772682\h2HYPERLINK\l"_Toc359772683"2系统总体方案设计PAGEREF_Toc359772683\h3HYPERLINK\l"_Toc359772684"2.1方案设计PAGEREF_Toc359772684\h3HYPERLINK\l"_Toc359772685"2.2方案论证PAGEREF_Toc359772685\h3HYPERLINK\l"_Toc359772686"2.2.1车流量检测方案PAGEREF_Toc359772686\h3HYPERLINK\l"_Toc359772687"2.2.2显示方案选择PAGEREF_Toc359772687\h5HYPERLINK\l"_Toc359772688"2.3芯片选择及介绍PAGEREF_Toc359772688\h5HYPERLINK\l"_Toc359772689"2.3.1AT89C51主要特点PAGEREF_Toc359772689\h5HYPERLINK\l"_Toc359772690"2.3.2AT89C51外部引脚PAGEREF_Toc359772690\h5HYPERLINK\l"_Toc359772691"2.3.3AT89C51内部结构PAGEREF_Toc359772691\h7HYPERLINK\l"_Toc359772692"3系统硬件电路设计PAGEREF_Toc359772692\h8HYPERLINK\l"_Toc359772693"3.1单片机最小系统设计PAGEREF_Toc359772693\h8HYPERLINK\l"_Toc359772694"3.1.1时钟电路PAGEREF_Toc359772694\h8HYPERLINK\l"_Toc359772695"3.1.2复位电路PAGEREF_Toc359772695\h8HYPERLINK\l"_Toc359772696"3.2传感检测电路设计PAGEREF_Toc359772696\h8HYPERLINK\l"_Toc359772697"3.2.1光电开关的工作原理PAGEREF_Toc359772697\h8HYPERLINK\l"_Toc359772698"3.2.2电路连接PAGEREF_Toc359772698\h9HYPERLINK\l"_Toc359772699"3.3显示电路设计PAGEREF_Toc359772699\h10HYPERLINK\l"_Toc359772700"3.4电源电路设计PAGEREF_Toc359772700\h11HYPERLINK\l"_Toc359772701"3.5系统电路设计PAGEREF_Toc359772701\h11HYPERLINK\l"_Toc359772702"4系统软件设计PAGEREF_Toc359772702\h12HYPERLINK\l"_Toc359772703"4.1系统工作状态说明PAGEREF_Toc359772703\h12HYPERLINK\l"_Toc359772704"4.2相关参数说明PAGEREF_Toc359772704\h15HYPERLINK\l"_Toc359772705"4.3系统主程序设计PAGEREF_Toc359772705\h15HYPERLINK\l"_Toc359772706"4.4中断程序流程图PAGEREF_Toc359772706\h16HYPERLINK\l"_Toc359772707