基于51單片機(jī)的多功能數(shù)字時(shí)鐘設(shè)計(jì)-畢業(yè)論文設(shè)計(jì)_第1頁
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1、目錄摘要......................................................................................................................1ABSTRACT.........................................................................................

2、...................21概述...............................................................................................................31.1本課題研究目的及意義.................................................................31.2國內(nèi)外

3、研究背景.............................................................................31.3本課題的研究方法及預(yù)期達(dá)到的目的.........................................42總體控制方案設(shè)計(jì)....................................................................

4、..................52.1數(shù)字時(shí)鐘的工作原理.....................................................................52.2單片機(jī)的選型.................................................................................52.3AT89C51單片機(jī)介紹.............

5、.......................................................72.4總體方案設(shè)計(jì).................................................................................83硬件設(shè)計(jì)....................................................................

6、....................................93.1鍵盤模塊.........................................................................................93.2顯示模塊...............................................................................

7、..........93.3復(fù)位電路.......................................................................................123.4蜂鳴器驅(qū)動(dòng)電路...........................................................................134軟件設(shè)計(jì).....................

8、.................................................................................154.1總體軟件設(shè)計(jì)...............................................................................154.2中斷服務(wù)函數(shù)......................................

9、.........................................154.3計(jì)時(shí)子函數(shù)...................................................................................164.4鬧鐘子函數(shù)流程圖.......................................................................17

10、4.5鍵盤掃描子函數(shù)...........................................................................184.6時(shí)間和鬧鐘的設(shè)置......................................................................194.7軟件設(shè)計(jì)總結(jié).........................................

11、.....................................205總結(jié)...............................................................................................................226參考文獻(xiàn)............................................................

12、..........................................237致謝................................................................................................................24附錄.........................................................

13、...........................................................242ABSTRACTInrecentyearselectronictechnologyhasgainedrapiddevelopmentmodernelectronicproductshasbeenusedinalmostallspheresofsocietyIt’sastrongimpetustothedevelop

14、mentofsocialproductivityimprovementinthelevelofsocialinfmation.Theperfmanceofmodernelectronicproductsalsohasbeenfurtherimproved.Thedigitalclocktimingisadigitalcircuitwhichdisplays“hour““minute““second“.Theaccuracystabili

15、tyofdigitalclockisfarmethantheoldfashionedmechanicalclock.Inthisdesignweuse8segmentLEDdigitaldisplaydisplayedaccdingtodigitaldynamicdisplayprinciplewitha12MHzcrystaloscillatpulsethetimercountanexternalspeakerisusedasther

16、ing.Inthisdesignthecircuithasthefunctiontodisplaytimethetimecanbeadjusted.Becausedigitalclockhastheadvantageoflowpriceshighprecisioneasytousemultifunctioneasyintegrationitislovedbythemajityofconsumptionsoithasbeenwidelyu

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