目录序言......................................................错误!未定义书签。1绪论.......................................................................31.1课题背景...............................................................31.2里程表的发展...........................................................31.3设计的主要内容及技术指标.............................................52硬件的设计..................................................................62.1单片机简介..............................................................62.2AT89系列单片机简介...................................................72.3AT89C52系列单片机的介绍.............................................72.4里程表各部分电咐绍...............................................102.2.1霍尔传瞬电路....................................................102.2.2里程指示电路.......................................................102.2.3里程数据存储电路................................................112.2.4时钟电路..........................................................122.2.5LED显示模块电路及74LS07驱动器................................123软件的设计................................................................153.1系统的总体设计......................................................153.1单片机应用软件设计................................................153.2中断控制.............................................................173.3I/O口的控制方式...................................................173.4里程表的软件设计...................................................183.4.1总体设计思路.....................................................193.4.2里程的设计.........................................................213.4.3存贮历史里程数据的设计..........................................213.4.4里程的显示设计....................................................303.4.5里程公里数的累计功能设计..........................................344软件调试..................................................................40ThisdocumentisproducedbytrialversionofPrint2Flash(www.print2flash.com)4.1程序的检测与调试....................................................404.2单片机开发