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1、项目一单片机最小系统设计（Thesmallestsystemdesignofprojectsinglechipmicrocomputer）Thispaperiscontributedbyap0705307DOCdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyouselectTXTfirstordownloadthesourcefiletothelocalmachine.Item11.1taskdescriptionBriefintroductionof1.LEDBasicapplicationofs
2、inglechipmicrocomputerThelightemittingdiodeLED(LightEmittingdiode),itsshapeasshowninFigure1-1,ithasred,greenandbluecolor,hastheadvantagesofhighbrightness,brightcolor,goodstability,lowpowerconsumption,highluminousefficiency,longservicelifeetc..LEDisrichincolor,smallsize,energysaving,durable,very
3、suitablefordecorativepurposes,itismountedonacircuitboardoraflexiblecable,canbeusedasalamp,lightcard,signtheletterofthetracklights,lamp.LargeLEDdisplaysareusedforinformationdisplayandlargescreendisplay,widelyusedinstadiums,airports,commercialcentersandsoon.Figure1-1.Theinternalstructureof2.LEDLi
4、ghtemittingdiodeprofileLEDisaninternalchipjunction,asshowninFigure1-2,theentirechippackagetobeepoxyresin,shortpinsislongpincathode,anode,whenthePNjunctioninforwardconductionstatecurrentfrompositivetonegative,LED,semiconductorcrystalsonadifferentcolor,light,lightintensitytherelatedcurrent,thecol
5、orofthelightisdeterminedbythesemiconductormaterial,therearered,greenandblue,yellowandothercolors.GoldwirecombinedwithpartiallyroundepoxylensLEDchipReflectivecapPositivepinnegativepinFigure1-1theinternalstructureof3.LED,LEDlight-emittingcircuitcommonsingletubeLEDoperatingvoltageis1.7-3.6V,thewor
6、kingcurrentis3-10mA,usingthecircuitasshowninFigure1-3canbelitLED.One1K+5VFigure1-3singletubeLEDlightemittingcircuitLEDworkingvoltage1.7V,thenthecurrentlimitingresistorvoltageis3.3V,thecurrentis3.3mA.TheLEDcanbemadeintoaverybeautifullightboxandbillboardwithacertainarrangementofrulesandacombinati
7、onoflightandextinction,asshowninfigure1-4.Figure1-4LEDbillboardmicrocontrollerisoftenusedtocontroltheLEDlightsout,colorconversion,ourfirsttaskishowtouseSCMtocontrolaLEDlamplightsout.Inviewoftheaboverequirements,wehave3problemstobe
