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1、摘要近年来,随着单片机档次的不断提高,功能的不断完善,其应用日趋成熟,应用领域日趋扩大,特别是工业测控、尖端武器和日用家电等领域更是因为有了单片机而生辉增色.单片机应用技术已成为一项新的工程应用技术.本毕业设计正是以AT89S51单片机为中心设计的篮球比赛计时器。虽然篮球比赛计时器电路功能比较简单,但是设计它的意义在于能使学生将所学到的知识综合应用,提高动手实践能力.本电路主要由五个模块构成：秒脉冲发生器、计数器、译码显示电路、控制电路和报警电路。七段共阴LED数码管构成计时显示电路,具有计时器直控制电路直接控制计数器启动计数、暂停/连续计数、译码
2、显示电路的显示等功能。当控制电路的置数开关闭合时，在数码管上显示数字24，每当一个秒脉信号输入到计数器时，数码管上的数字就会自动减1，当计时器递减到零时，报警电路发出光电报警信号。关键词：单片机AT89C51共阴极LED数码显示器显示电路控制电路报警电路AbstractSummaryinrecentyears,assingletabletsmachinegradeofconstantlyimprove,functionofconstantlyperfect,itsapplicationincreasinglymature,applicationar
3、eaincreasinglyexpanded,especiallyindustrialmeasurementandcontrol,andtipweaponsanddailyappliances,areamoreisbecausehashassingletabletsmachineandhealthfaicolour.singletabletsmachinetechnologyhasbecameaitemsnewofengineeringtechnology.ThisgraduateddesignistoAT89S51singletabletsmac
4、hineforCenterdesignofbasketballcompetitiontimingdevice.Whilethetimercircuitfeaturesthebasketballgameisrelativelysimple,butitssignificanceisdesignedtoenablestudentstolearntheknowledgeofintegratedapplications,enhancethehands-onability.Thiscircuitismainlymadeupoffivemodules:pulse
5、generators,counters,displaydecodingcircuit,controlcircuitandalarmcircuits.ConstituteatimeofsevenYamLEDdigitaltubedisplaycircuits,directcontrolwithtimercontrolcircuit,pause/continuouscounterstartscountingfeaturessuchasdisplayofthecount,displaydecodingcircuit.Whenthenumberofther
6、esetcontrolcircuitwhentheswitchisclosed,inthedigitaldisplaysonDigital24,wheneverthepulseinputsignaltoasecondcounter,digitalCanalDigitalisautomaticallyreducedon1,whenthetimerdecrementsto0o'clock,alarmcircuitofopticalalarmsignalwasissued.Keywords：AT89S51single-chipmicrocomputerA
7、ltogethercathodeLEDdigitaldisplaydisplaydecodingcircuitcontrolcircuitalarmcircuit目录第一章绪论11.1课题背景11.2单片机概述.....................................................1.2.1单片机简介..................................................1.2.2单片机的特点...............................................1
8、.2.3单片机的应用领域...........................................1.2.4单
