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1、湖北理工学院毕业设计[论文]题目:秒表的设计院系:专业:姓名:指导老师:摘要本系统由石英晶体振荡器、分频器、计数器、译码器、LED显示器组成,采用了中小规模集成芯片。总体方案设计由主体电路和扩展电路两大部分组成。其中主体电路完成数字钟的基本功能,扩展电路完成数字计时器的扩展功能,进行了各单元设计,总体调试。数字计时器是由脉冲发生电路、计时和显示电路、清零电路、几部分组成的,电路由振荡器、分频器、计数器、译码器、显示器等元件构成。振荡器产生的脉冲信号经过分频器分频作用后为秒脉冲,秒脉冲送入计数器,计数器计数并且通过“时”、“分”、“秒
2、”译码器显示时间。本系统由计数器、译码器、LED显示器采用了中小规模集成芯片。总体方案设计由主体电路和扩展电路两大部分组成。其中主体电路完成循环显示的基本功能,扩展电路完成启动停止的扩展功能,进行了各单元设计,总体调试。本文首先描述系统硬件工作原理,并附以系统结构框图加以说明,着重介绍了本系统模块的功能及工作过程,其次,详细阐述了程序的各个模块和实现方法。本设计以数字集成电路技术为基础。本文编写的主导思想是以硬件为基础,来进行各功能模块的编写。关键词:石英晶体;分频器;计数器;译码器;脉冲AbstractSystemhasbeenc
3、omposedofcrystaloscillator,frequencydivisionimplement,counter,decoder,LEDdisplay,hasadoptedtobehitbythesmall-scaleintegrationchip.Twomajorpartdesigningfrommainbodycircuitandexpandingacircuitarecomposedofanoverallplan.Mainbodycircuitsamongthemaccomplishfundamentaldigita
4、lclockfunction,expandacircuitaccomplishingthefigurecalculagraphexpansionfunction,theelementhavingcarriedouteverydesignsthat,populationdebugs.Figurecalculagraphistobecomposedofpulsegeneratingcircuit,circuit,zeroclearingcircuit,severalpartsreckoningbytimeandshowing,theci
5、rcuitiscomposedofcomponentssuchasoscillator,frequencydivisionimplement,counter,decoder,display.Thepulsesignalthattheoscillatorproducescountsanddemonstratestimeby"time","mark","second"decoderbythatthefrequencydivisionimplementfrequencydivisioneffectqueenbeingsecondofpul
6、se,secondofpulsesendinginthecounter,thecounter.Thissystemhasadoptthemiddlesmall-scaleintegrationchipfromthecounter,decoder,LEDdisplay.Twomajorpartdesigningfrommainbodycircuitandexpandingacircuitarecomposedofanoverallplan.Mainbodycircuitsamongthemaccomplishthefundamenta
7、lfunctionthatcirculationdemonstrates,expandacircuitaccomplishingthestartingstopexpansionfunction,theelementhavingcarriedouteverydesignsthat,populationdebugs.Systemhardwareoperatingprinciplethemainbodyofabookisdescribedfirst,andattachtheblockdiagramgivesexplanationwiths
8、ystemstructure,emphasizethemoduleandrealizationmethodhavingintroducedsystemmodulefunctionandcourseofwork,havingsetfor