摘要20世纪末，电子技术获得了飞速的发展，在其推动下，现代电子产品几乎渗透了社会的各个领域。那些对时间要求非常严格和准确的人来说，时间的不准确会带来非常大的麻烦，数码管显示的时间简单明了而且读数快、时间准确显示到秒。而机械式时钟依赖于晶体震荡器，可能会导致误差。所以以数码管为显示器的时钟比指针式的时钟表现出了很大的优势。多功能数字电子钟是采用数字电路实现对“时”、“分”、“秒”数字显示的计时装置。数字钟的精度、稳定度远远超过老式机械钟。在这次设计中，采用LED数码管显示时、分、秒，分别以12进制和24进制两种方案进行计时。用1Hz的晶振脉冲做为计数器的触发脉冲，分别设计了12进制、24进制和60进制计数器，根据数码管动态显示原理来进行显示。通过multism软件对设计的系统进行仿真分析，仿真结果正确。该系统具有时间显示、时间调整、闹钟、整点报时等功能。设计的多功能数字钟体积小巧，价格低廉，走时精度高，使用方便，功能完善，有一定的应用价值。关键字：数字电子钟，LED数码管，触发脉冲，整点报时AbstractThe20thcentury,electronictechnologyhasexperiencedrapidgrowthinitspromotion,modernelectronicproductalmostpermeatedeachsocialfields.Thoseverystrictdemandsontimeandaccuratepeople,timeisnotaccuratewillbringverybigtrouble,digitalpipedisplaytimesimpleandfastreading,timeshowtotheseconds.Andmechanicalclockdependsonthecrystaloscillator,couldleadtoerrors.Sotodigitalpipefortheclockdisplaypointertypethantheclockshowedalotofadvantage.Multi-functiondigitalelectricclockisthedigitalcircuittorealize"hour"and"minute","seconds"digitaldisplaytimerdevice.Adigitalclockprecision,stabilityisfarmorethanoldmechanicalclock.Inthisdesign,LEDdigitaldisplaywhenthetube,minutesandseconds,respectivelyto12and24intosystemintothetwoschemesforthetimer.1Hzwiththecrystalsasthecounterpulsetriggeringpulse,weredesigned12intosystem,andintothesystemand60intothecounter,accordingtotheprincipleofdigitaldynamicdisplaytoshow.Throughthemultismsoftwaretodesignofsystemsimulationanalysis,thesimulationresultsarecorrect.Thesystemhastimetoshow,timetoadjust,thewholepoint,alarmclocktimeetc.Function.Thedesignofthemulti-functiondigitalclocksmallsize,lowprices,whenthehighprecision,easytouse,theperfectfunction,havecertainapplicationvalue.Keywords:digitalelectricclock,LEDnixietube,triggerpulse,integralpointreporthour目录1前言..............................................................11.1发展概述.......................................................11.2数字电子钟的意义...............................................21.3数字电子钟的研究内容...........................................22开发工具软件介绍....................................................32.1仿真软件选择..................................................32.2同类软件比较..................................................63系统方案设计........................................................93.1设计目的.......................................................93.2设计方案.......................................................93.3计数器........................................................113.4比较器........................................................114系统实现...........................................................144.1.秒脉冲产生电路...............................................144.2系统设计方案一................................................164.2.1六十进制计数器..........................................174.2.2二十四进制计数器........................................184.3数字电子钟交流.................
