毕业论文基于单片机数字式电子秒表电路设计基于单片机数字式电子秒表电路设计摘要时间是工农业生产，国防，人民生活等领域不可缺少的。它涉及到我们工作，生活的各个方面。没有时间人们的一切行为都无法进行本篇论文是利用单片机（SinglechipMicrocomputer）AT89C51和接口外围电路8279芯片等组成的时钟和秒表双重功能的电子秒表电路。整个电路由硬件电路和软件程序两部分组成。硬件电路由单片机AT89C51、接口芯片8279等元件组成，它使用元件少，电路结构简单，功能强；软件程序采用汇编语言进行设计，它结构合理，思路清晰，利用中断服务程序对各种事件进行处理，提高微处理器的工作效率。关键词：微处理器中断接口电路数码显示按键电路I基于单片机数字式电子秒表电路设计AbstractTimeistheindustryandagricultureproduction,nationaldefense,andpeople'slivingareassuchasindispensable.Itinvolvesourwork,allaspectsoflife.Notallthetimepeopleareunabletoact.Thispaperisusingsingle-chipMicrocomputerchip(your)AT89C51andinterfacecircuit8279peripheralcomponents,suchaschipclocksandstopwatchfunctionofelectronicstopwatchcircuit.Thecircuithardwarecircuitandsoftwareprogrambytwoparts.ThehardwarecircuitofmicrocomputerAT89C51,interfacechip8279etc,itUSEScomponentscomponents,suchassimplestructure,thefunctionisstrong,Softwaredesignusingassemblylanguage,itsstructureisreasonable,clarity,usinganinterruptserviceroutinetreatmentofvariousevents,improveworkefficiencyofmicroprocessors.Keywords:Microcomputer，interrupt，interfacecircuit，digitaldisplay，switchcircuitII基于单片机数字式电子秒表电路设计目录摘要.................................................................................................................ⅠAbstract........................................................................................................Ⅱ目录...............................................................................................................III前言.................................................................................................................11.设计功能与要求.........................................................................................21.1系统功能...........................................................................................21.2设计要求..........................................................................................22.设计构思.....................................................................................................33.硬件电路原理框图.....................................................................................44.硬件电路的设计与实现.............................................................................54.1AT89C51微处理器介绍...................................................................54.1.1AT89C51微处理器的背景...................................................54.1.2AT89C51单片机的功能结构...............................................54.1.3AT89C51单片机的应用.......................................................64.2接口芯片的介绍...............................................................................74.2.1芯片8279的背景..................................................................74.2.2芯片8279的功能结构..........................................................74.2.3芯片8279的应用..................................................................84.3译码器74LS138功能结构...............................................................94.4总线锁存器74LS373功能结构...........
