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外文翻译--AT89C2051.doc

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外文翻译--AT89C2051.doc

AT89C2051AT89C2051ismadeintheATMELCorporation,whichisthelowvoltage,highperformanceCMOS8bitmicrocontroller,Tabletscontainingrepeated2kbytesofprogrammemoryerasablereadonlyPEROMandrandom128bytesdatamemoryRAM,deviceusingATMELshighdensity,nonvolatilememorytechnology,CompatiblewiththestandardofMCS51instructionset,builtchip8bitgeneralpurposecentralprocessingunitandrepeatedlywritetheFlashmemory,whichcaneffectivelyreducethedevelopmentcosts.AT89C2051featuresapowerfulsinglechipcanprovidecosteffectiveinmanyApplications.MainfeaturesCompatibletheMCS51commandsystemContainsthe2KBmemoryreprogrammingFLASH10002.76VvoltagerangethewholeStaticwork0Hz24KHzSecrets2ProgramMemoryLock1288bitinternalRAM15programmableI/OlinesTwo16bittimer/counter6interruptsources,twoexternalinterruptsourcesProgrammableSerialChannelHighPrecisionVoltageComparator(P1.0,P1.1,P3.6)HavetheoutputportoftheLEDdirectdriveLowpoweridleandpowerdownmodeThepinPictureofAT89C2051PictureonethepinofAT89C2051123456ABCD654321DCBATitleNumberRevisionSizeBDate21May2009SheetofFileD\ProgramFiles\DesignExplorer99SE\Library\Sch\ProtelDOSSchematicLibraries.ddbDrawnBy20191817161514131211GNDP3.5P3.4P3.3P3.2XTAL1XTAL2P3.1P3.0RSTP3.7P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7VCC12345678910AT89C2051sfunctionaldescriptionVCCPowerSupplyVoltageGNDlandP1portP1mouthisagroupof8bitbidirectionalI/Ointerface,P1.2P1.7provideinternalpullupresistor,P1.0andP1.1internalsupremepullupresistor.P1mouthoutputbuffercanabsorbthecurrent20mAanddirectdriveLED.WhenProgrammingandcalibration,P1mouthastheeighthaddressreceive.P3mouthP3portP3.0P3.5,P3.7istheinternalpullupresistorwiththesevenbidirectionalI/Ointerface.DidnotbringouttheP3.6,ItasagenericI/Oport,butcannotvisit.Canbeusedasafixedchipinputcomparatoroutputsignal.whenP3write1,theywerehighedtheinternalpullupresistorcanberaisedasaninputport.P3portspecialfunctionasshownintable1Table1P3mouthsspecialfeatures引脚功能特性P3.0RXD(串行输入口P3.1TXD(串行输出口)P3.20INT外中断0P3.31INT外中断1P3.4T0定时/计数器0外部输入P3.5T1(定时/计数器1外部输入)RSTResetoutput.Whentheoscillatordevicereset,RSTpintomaintainthehighleveloftwomachinecycletime.XTAL1theRPoscillatoramplifierandinternalclockgeneratorinput.XTAL2RPoscillatoroutputamplifier.TimerOverviewoftheTimer89C2051singlechipchiphastwo16bittimer/counter,Thatisthetimer0T0andTimer1T1.Theyallhavefromtimetotimeandeventcountfunction,Canbeusedfortimingcontrol,delayofexternalevents,suchascountingandtestingoccasions.TimersT0andT1two16bittimersinfactis16bitcounterplus1.Amongthem,T0compositionedbythetwo8bitspecialfunctionregistersTH0andTL0T1posedbytheTH1andTL1.ThesefunctionswerecontroledbythespecialfunctionregistersTMODandTCONWhensettotheworkinthetiming,Throughthepincountoftheexternalpulsesignal.Whentheinputpulsesignalgeneratedbythefallingedgeof10,Thevalueoftimerplus1.AtofeverymachinecycleduringtheS5P2samplingpinT0andT1theinputlevel,ifamachinecyclebeforesamplevalueof1,Thenextmachinecyclesamplingvalueis0,Thecounterplus1.SincethenduringS3P1ofthemachinecycle,Newvaluewillintothecounter.soDetectionofa10transitionofthetwomachinecycles,SoThemaximumcountfrequencyofoscillationfrequencyof1/24.Inadditiontotheoptionofworkfromtimetotimeorcount,Eachtimer/counterhavefourkindsofworkmode,Thatis,eachoftimercircuitkindsoffourconstituteastructuralmodelTwolowpowermodeIdlemodeInidlemode,CPUtomaintainsleepandallchipperipheralsremainactive,thiswaygeneratedinSoftware,Atthispoint,ChipRAMandallthecontentsofspecialfunctionregistersremainunchanged.Idlemodewasterminatedbyanyinterruptrequestpermissiontoorhardwarereset.P1.0andP1.1,inthenonuseofexternalpullupresistoronthecaseshouldbesetto0,Orintheuseofpullupresistorissetto1.ItshouldbenotedthatwhenusesofhardwareresetTerminationidlemode,AT89C2051isusuallystoppedfromtheprogramuntiltheinternalresetcontrolofthetwomachinecyclesbeforetherestoreprocedureService.InthiscasethehardwarewithintheprohibitionofthereadingandwritingofinternalRAM,However,toallowaccesstoports,ToeliminatetheHardwareresetintheidlemodeofportaccidentsmaywrite,Inprinciple,toentertheidlemodeofinstructionshouldnotbeunderthecommandofapinoranexternalmemoryportforavisit.PowerdownmodeInpowerdownmode,theoscillatortostopworking,enterthepowerdownmode,Instructions,whowasthelastone,theimplementationoftheDirective,ChipRAMandallthecontentsofspecialfunctionregisterstheterminationofthepreviouspowerdownmodebefrozen.Towithdrawfrompowerdownmodeistheonlywaytoresetthehardware,ResetwillredefinealltheSpecialFunctionRegistersbutDoesnotchangethecontentsofRAMbeforethetheVccworkreturnedtonormallevelsShallbenullandvoidandmustberesettomaintainacertainperiodoftimeinordertorestartandoscillatorstabilityP1.0andP1.1inthenonuseofexternalpullupresistoronthecaseshouldbesetto0,Orintheuseofpullupresistorissetto1.OscillatorOscillatorconnectedclientXTAL1RPoscillatoramplifierandinternalclockgeneratorinputXTAL2RPoscillatoramplifieroutputCharacteristicsofOscillatorXTAL1,XTAL2waretheRPchiposcillatoramplifierinputsandoutputs,Quartzcrystalcanbecomposedoftheclockoscillatororceramicoscillator,FormoreinformationfromtheexternalinputclockdriverAT89C2051,XTAL1inputclocksignalfrom,XTAL2shouldbeleftvacant.Astheinputtotheinternalcircuitisa2flipflop,Therefore,theexternalclocksignalinputwithoutspecialrequirements,However,itmustcomplywiththemaximumlevelandminimumnormsandtiming

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