PAGEiv阳泉职业技术学院----毕业设计说明书1摘要近年来随着计算机在社会领域的渗透和大规模集成电路的发展，单片机的应用正在不断地走向深入，由于它具有功能强，体积小，功耗低，价格便宜，工作可靠，使用方便等特点，因此特别适合于与控制有关的系统，越来越广泛地应用于自动控制，智能化仪器，仪表，数据采集，军工产品以及家用电器等各个领域，单片机往往是作为一个核心部件来使用，在根据具体硬件结构，以及针对具体应用对象特点的软件结合，以作完善。本次做的数字钟是以单片机（AT89C52）为核心，结合相关的元器件（共阴极LED数码显示器、BCD-锁存/7段译码/驱动器等），再配以相应的软件，达到制作简易数字钟的目的，其硬件部分难点在于元器件的选择、布局及焊接。数字电子时钟计时器的优点很多:可靠性高,控制精确度高,优良的焊接性能,权威的焊接专家数据库,远程诊断功能,远程控制功能,人性化设计,节能降耗体积小,本机采用改进的IGBT逆变技术，减小了主变压器及电抗器体积，从而减小了电源整机的体积和重量,大大降低了铜铁损，提高了电源的效率及功率因数，使节能效果非常显著。关键词：单片机应用电子钟AT89C52共阴极LED数码显示器AbstractInrecentyearsalongwiththecomputerinthesocialdomainseepageandthelargescaleintegratedcircuitdevelopment,themonolithicintegratedcircuitapplicationwasmovingtowardsunceasinglythoroughly,becauseithadfunction,thevolumewassmall,thepowerlosswaslow,thepricewascheap,theworkwasreliable,characteristicsandsooneasytooperate,thereforesuitedspeciallyinwiththecontrolrelatedsystem,moreandmorewidelyappliedintheautomaticcontrol,theintellectualizedinstrument,themeasuringappliance,thedataacquisition,themilitaryproductaswellasthedomesticelectricappliancesandsooneachdomain,themonolithicintegratedcircuitoftenistookacorepartused,inthebasisconcretehardwarearchitecture,aswellasinviewoftheconcreteapplicationobjectcharacteristicsoftwareunion,madetheconsummation.Thistimedoesthedigitalclockistakethemonolithicintegratedcircuit(AT89C52)asacore,unifiestherelatedprimarydevice(commoncathodeLEDnumericalcodemonitor,theBCD-locksaves/7sectionofdecoding/driverandsoon),againmatchesbythecorrespondingsoftware,achievedthemanufacturesimplenumeralclockthegoal,itshardwarepartialdifficultieslieintheprimarydevicethechoice,thelayoutandthewelding.Digitalelectronicclockcalculagraphmeritmany:Reliabilityheight,theheightcontrollingprecision,goodweldingfunction,authority'sweldingexpertdatabase,long-rangediagnosefunction,long-rangeunderthecontroloffunction,personalizationdesignthat,savingenergyandreducingconsumptionvolumehasbeensmall,thismachinehasadopttheIGBTcontra