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外文翻译-AT89C52---带有8K快闪的八位微控制器.doc

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外文翻译-AT89C52---带有8K快闪的八位微控制器.doc

8BitMicrocontrollerwith8KBytesFlashAT89C521.DescriptionTheAT89C52isalowpower,highperformanceCMOS8bitmicrocomputerwith8KbytesofFlashprogrammableanderasablereadonlymemoryPEROM.ThedeviceismanufacturedusingAtmelshighdensitynonvolatilememorytechnologyandiscompatiblewiththeindustrystandard80C51and80C52instructionsetandpinout.TheonchipFlashallowstheprogrammemorytobereprogrammedinsystemorbyaconventionalnonvolatilememoryprogrammer.Bycombiningaversatile8bitCPUwithFlashonamonolithicchip,theAtmelAT89C52isapowerfulmicrocomputerwhichprovidesahighlyflexibleandcosteffectivesolutiontomanyembeddedcontrolapplications.2.FeaturesCompatiblewithMCS51™Products8KBytesofInSystemReprogrammableFlashMemory–Endurance1,000Write/EraseCyclesFullyStaticOperation0Hzto24MHzThreeLevelProgramMemoryLock256x8BitInternalRAM32ProgrammableI/OLinesThree16BitTimer/CountersEightInterruptSourcesProgrammableSerialChannelLowPowerIdleandPowerDownModesTheAT89C52providesthefollowingstandardfeatures8KbytesofFlash,256bytesofRAM,32I/Olines,three16bittimer/counters,asixvectortwolevelinterruptarchitecture,afullduplexserialport,onchiposcillator,andclockcircuitry.Inaddition,theAT89C52isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheCPUwhileallowingtheRAM,timer/counters,serialport,andinterruptsystemtocontinuefunctioning.ThePowerDownModesavestheRAMcontentsbutfreezestheoscillator,disablingallotherchipfunctionsuntilthenexthardwarereset.3.PinDescriptionVCCSupplyvoltage.GNDGround.Port0Port0isan8bitopendrainbidirectionalI/Oport.Asanoutputport,eachpincansinkeightTTLinputs.When1sarewrittentoport0pins,thepinscanbeusedashighimpedanceinputs.Port0canalsobeconfiguredtobethemultiplexedloworderaddress/databusduringaccessestoexternalprogramanddatamemory.Inthismode,P0hasinternalpullups.Port0alsoreceivesthecodebytesduringFlashprogrammingandoutputsthecodebytesduringprogramverification.Externalpullupsarerequiredduringprogramverification.Port1Port1isan8bitbidirectionalI/Oportwithinternalpullups.ThePort1outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort1pins,theyarepulledhighbytheinternalpullupsandcanbeusedasinputs.Asinputs,Port1pinsthatareexternallybeingpulledlowwillsourcecurrentIILbecauseoftheinternalpullups.Inaddition,P1.0andP1.1canbeconfiguredtobethetimer/counter2externalcountinputP1.0/T2andthetimer/counter2triggerinputP1.1/T2EX,respectively,asshowninthefollowingtable.Port1alsoreceivestheloworderaddressbytesduringFlashprogrammingandverification.Port2Port2isan8bitbidirectionalI/Oportwithinternalpullups.ThePort2outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort2pins,theyarepulledhighbytheinternalpullupsandcanbeusedasinputs.Asinputs,Port2pinsthatareexternallybeingpulledlowwillsourcecurrentIILbecauseoftheinternalpullups.Port2emitsthehighorderaddressbyteduringfetchesfromexternalprogrammemoryandduringaccessestoexternaldatamemorythatuse16bitaddressesMOVXDPTR.Inthisapplication,Port2usesstronginternalpullupswhenemitting1s.Duringaccessestoexternaldatamemorythatuse8bitaddressesMOVXRI,Port2emitsthecontentsoftheP2SpecialFunctionRegister.Port2alsoreceivesthehighorderaddressbitsandsomecontrolsignalsduringFlashprogrammingandverification.Port3Port3isan8bitbidirectionalI/Oportwithinternalpullups.ThePort3outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort3pins,theyarepulledhighbytheinternalpullupsandcanbeusedasinputs.Asinputs,Port3pinsthatareexternallybeingpulledlowwillsourcecurrentIILbecauseofthepullups.Port3alsoservesthefunctionsofvariousspecialfeaturesoftheAT89C51,asshowninthefollowingtable.Port3alsoreceivessomecontrolsignalsforFlashprogrammingandverification.RSTResetinput.Ahighonthispinfortwomachinecycleswhiletheoscillatorisrunningresetsthedevice.ALE/PROGAddressLatchEnableisanoutputpulseforlatchingthelowbyteoftheaddressduringaccessestoexternalmemory.ThispinisalsotheprogrampulseinputPROGduringFlashprogramming.Innormaloperation,ALEisemittedataconstantrateof1/6theoscillatorfrequencyandmaybeusedforexternaltimingorclockingpurposes.Note,however,thatoneALEPortPinAlternateFunctionsP1.0T2externalcountinputtoTimer/Counter2,clockoutP1.1T2EXTimer/Counter2capture/reloadtriggeranddirectioncontrolPortPinAlternateFunctionsP3.0RXDserialinputportP3.1TXDserialoutputportP3.2INT0externalinterrupt0P3.3INT1externalinterrupt1P3.4T0timer0externalinputP3.5T1timer1externalinputP3.6WRexternaldatamemorywritestrobeP3.7RDexternaldatamemoryreadstrobepulseisskippedduringeachaccesstoexternaldatamemory.Ifdesired,ALEoperationcanbedisabledbysettingbit0ofSFRlocation8EH.Withthebitset,ALEisactiveonlyduringaMOVXorMOVCinstruction.Otherwise,thepinisweaklypulledhigh.SettingtheALEdisablebithasnoeffectifthemicrocontrollerisinexternalexecutionmode.PSENProgramStoreEnableisthereadstrobetoexternalprogrammemory.WhentheAT89C52isexecutingcodefromexternalprogrammemory,PSENisactivatedtwiceeachmachinecycle,exceptthattwoPSENactivationsareskippedduringeachaccesstoexternaldatamemory.EA/VPPExternalAccessEnable.EAmustbestrappedtoGNDinordertoenablethedevicetofetchcodefromexternalprogrammemorylocationsstartingat0000HuptoFFFFH.Note,

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