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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

8BITMICROCONTROLLERWITH8KBYTESFLASHAT89C521DESCRIPTIONTHEAT89C52ISALOWPOWER,HIGHPERFORMANCECMOS8BITMICROCOMPUTERWITH8KBYTESOFFLASHPROGRAMMABLEANDERASABLEREADONLYMEMORYPEROMTHEDEVICEISMANUFACTUREDUSINGATMEL’SHIGHDENSITYNONVOLATILEMEMORYTECHNOLOGYANDISCOMPATIBLEWITHTHEINDUSTRYSTANDARD80C51AND80C52INSTRUCTIONSETANDPINOUTTHEONCHIPFLASHALLOWSTHEPROGRAMMEMORYTOBEREPROGRAMMEDINSYSTEMORBYACONVENTIONALNONVOLATILEMEMORYPROGRAMMERBYCOMBININGAVERSATILE8BITCPUWITHFLASHONAMONOLITHICCHIP,THEATMELAT89C52ISAPOWERFULMICROCOMPUTERWHICHPROVIDESAHIGHLYFLEXIBLEANDCOSTEFFECTIVESOLUTIONTOMANYEMBEDDEDCONTROLAPPLICATIONS2FEATURESCOMPATIBLEWITHMCS51™PRODUCTS8KBYTESOFINSYSTEMREPROGRAMMABLEFLASHMEMORY–ENDURANCE1,000WRITE/ERASECYCLESFULLYSTATICOPERATION0HZTO24MHZTHREELEVELPROGRAMMEMORYLOCK256X8BITINTERNALRAM32PROGRAMMABLEI/OLINESTHREE16BITTIMER/COUNTERSEIGHTINTERRUPTSOURCESPROGRAMMABLESERIALCHANNELLOWPOWERIDLEANDPOWERDOWNMODESTHEAT89C52PROVIDESTHEFOLLOWINGSTANDARDFEATURES8KBYTESOFFLASH,256BYTESOFRAM,32I/OLINES,THREE16BITTIMER/COUNTERS,ASIXVECTORTWOLEVELINTERRUPTARCHITECTURE,AFULLDUPLEXSERIALPORT,ONCHIPOSCILLATOR,ANDCLOCKCIRCUITRYINADDITION,THEAT89C52ISDESIGNEDWITHSTATICLOGICFOROPERATIONDOWNTOZEROFREQUENCYANDSUPPORTSTWOSOFTWARESELECTABLEPOWERSAVINGMODESTHEIDLEMODESTOPSTHECPUWHILEALLOWINGTHERAM,TIMER/COUNTERS,SERIALPORT,ANDINTERRUPTSYSTEMTOCONTINUEFUNCTIONINGTHEPOWERDOWNMODESAVESTHERAMCONTENTSBUTFREEZESTHEOSCILLATOR,DISABLINGALLOTHERCHIPFUNCTIONSUNTILTHENEXTHARDWARERESET3PINDESCRIPTIONVCCSUPPLYVOLTAGEGNDGROUNDPORT0PORT0ISAN8BITOPENDRAINBIDIRECTIONALI/OPORTASANOUTPUTPORT,EACHPINCANSINKEIGHTTTLINPUTSWHEN1SAREWRITTENTOPORT0PINS,THEPINSCANBEUSEDASHIGHIMPEDANCEINPUTSPORT0CANALSOBECONFIGUREDTOBETHEMULTIPLEXEDLOWORDERADDRESS/DATABUSDURINGACCESSESTOEXTERNALPROGRAMANDDATAMEMORYINTHISMODE,P0HASINTERNALPULLUPSPORT0ALSORECEIVESTHECODEBYTESDURINGFLASHPROGRAMMINGANDOUTPUTSTHECODEBYTESDURINGPROGRAMVERIFICATIONEXTERNALPULLUPSAREREQUIREDDURINGPROGRAMVERIFICATIONPORT1PORT1ISAN8BITBIDIRECTIONALI/OPORTWITHINTERNALPULLUPSTHEPORT1OUTPUTBUFFERSCANSINK/SOURCEFOURTTLINPUTSWHEN1SAREWRITTENTOPORT1PINS,THEYAREPULLEDHIGHBYTHEINTERNALPULLUPSANDCANBEUSEDASINPUTSASINPUTS,PORT1PINSTHATAREEXTERNALLYBEINGPULLEDLOWWILLSOURCECURRENTIILBECAUSEOFTHEINTERNALPULLUPSINADDITION,P10ANDP11CANBECONFIGUREDTOBETHETIMER/COUNTER2EXTERNALCOUNTINPUTP10/T2ANDTHETIMER/COUNTER2TRIGGERINPUTP11/T2EX,RESPECTIVELY,ASSHOWNINTHEFOLLOWINGTABLEPORT1ALSORECEIVESTHELOWORDERADDRESSBYTESDURINGFLASHPROGRAMMINGANDVERIFICATIONPORT2PORT2ISAN8BITBIDIRECTIONALI/OPORTWITHINTERNALPULLUPSTHEPORT2OUTPUTBUFFERSCANSINK/SOURCEFOURTTLINPUTSWHEN1SAREWRITTENTOPORT2PINS,THEYAREPULLEDHIGHBYTHEINTERNALPULLUPSANDCANBEUSEDASINPUTSASINPUTS,PORT2PINSTHATAREEXTERNALLYBEINGPULLEDLOWWILLSOURCECURRENTIILBECAUSEOFTHEINTERNALPULLUPSPORT2EMITSTHEHIGHORDERADDRESSBYTEDURINGFETCHESFROMEXTERNALPROGRAMMEMORYANDDURINGACCESSESTOEXTERNALDATAMEMORYTHATUSE16BITADDRESSESMOVXDPTRINTHISAPPLICATION,PORT2USESSTRONGINTERNALPULLUPSWHENEMITTING1SDURINGACCESSESTOEXTERNALDATAMEMORYTHATUSE8BITADDRESSESMOVXRI,PORT2EMITSTHECONTENTSOFTHEP2SPECIALFUNCTIONREGISTERPORT2ALSORECEIVESTHEHIGHORDERADDRESSBITSANDSOMECONTROLSIGNALSDURINGFLASHPROGRAMMINGANDVERIFICATIONPORT3PORT3ISAN8BITBIDIRECTIONALI/OPORTWITHINTERNALPULLUPSTHEPORT3OUTPUTBUFFERSCANSINK/SOURCEFOURTTLINPUTSWHEN1SAREWRITTENTOPORT3PINS,THEYAREPULLEDHIGHBYTHEINTERNALPULLUPSANDCANBEUSEDASINPUTSASINPUTS,PORT3PINSTHATAREEXTERNALLYBEINGPULLEDLOWWILLSOURCECURRENTIILBECAUSEOFTHEPULLUPSPORT3ALSOSERVESTHEFUNCTIONSOFVARIOUSSPECIALFEATURESOFTHEAT89C51,ASSHOWNINTHEFOLLOWINGTABLEPORT3ALSORECEIVESSOMECONTROLSIGNALSFORFLASHPROGRAMMINGANDVERIFICATIONRSTRESETINPUTAHIGHONTHISPINFORTWOMACHINECYCLESWHILETHEOSCILLATORISRUNNINGRESETSTHEDEVICEALE/PROGADDRESSLATCHENABLEISANOUTPUTPULSEFORLATCHINGTHELOWBYTEOFTHEADDRESSDURINGACCESSESTOEXTERNALMEMORYTHISPINISALSOTHEPROGRAMPULSEINPUTPROGDURINGFLASHPROGRAMMINGINNORMALOPERATION,ALEISEMITTEDATACONSTANTRATEOF1/6THEOSCILLATORFREQUENCYANDMAYBEUSEDFOREXTERNALTIMINGORCLOCKINGPURPOSESNOTE,HOWEVER,THATONEALEPORTPINALTERNATEFUNCTIONSP10T2EXTERNALCOUNTINPUTTOTIMER/COUNTER2,CLOCKOUTP11T2EXTIMER/COUNTER2CAPTURE/RELOADTRIGGERANDDIRECTIONCONTROLPORTPINALTERNATEFUNCTIONSP30RXDSERIALINPUTPORTP31TXDSERIALOUTPUTPORTP32INT0EXTERNALINTERRUPT0P33INT1EXTERNALINTERRUPT1P34T0TIMER0EXTERNALINPUTP35T1TIMER1EXTERNALINPUTP36WREXTERNALDATAMEMORYWRITESTROBEP37RDEXTERNALDATAMEMORYREADSTROBEPULSEISSKIPPEDDURINGEACHACCESSTOEXTERNALDATAMEMORYIFDESIRED,ALEOPERATIONCANBEDISABLEDBYSETTINGBIT0OFSFRLOCATION8EHWITHTHEBITSET,ALEISACTIVEONLYDURINGAMOVXORMOVCINSTRUCTIONOTHERWISE,THEPINISWEAKLYPULLEDHIGHSETTINGTHEALEDISABLEBITHASNOEFFECTIFTHEMICROCONTROLLERISINEXTERNALEXECUTIONMODEPSENPROGRAMSTOREENABLEISTHEREADSTROBETOEXTERNALPROGRAMMEMORYWHENTHEAT89C52ISEXECUTINGCODEFROMEXTERNALPROGRAMMEMORY,PSENISACTIVATEDTWICEEACHMACHINECYCLE,EXCEPTTHATTWOPSENACTIVATIONSARESKIPPEDDURINGEACHACCESSTOEXTERNALDATAMEMORYEA/VPPEXTERNALACCESSENABLEEAMUSTBESTRAPPEDTOGNDINORDERTOENABLETHEDEVICETOFETCHCODEFROMEXTERNALPROGRAMMEMORYLOCATIONSSTARTINGAT0000HUPTOFFFFHNOTE,

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