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THEAT89C52ISALOWPOWER,HIGHPERFORMANCECMOS8BITMICROCOMPUTERWITH8KBYTESOFFLASHPROGRAMMABLEANDERASABLEREADONLYMEMORYPEROMTHEDEVICEISMANUFACTUREDUSINGATMEL’SHIGHDENSITYNONVOLATILEMEMORYTECHNOLOGYANDISCOMPATIBLEWITHTHEINDUSTRYSTANDARD80C51AND80C52INSTRUCTIONSETANDPINOUTTHEONCHIPFLASHALLOWSTHEPROGRAMMEMORYTOBEREPROGRAMMEDINSYSTEMORBYACONVENTIONALNONVOLATILEMEMORYPROGRAMMERBYCOMBININGAVERSATILE8BITCPUWITHFLASHONAMONOLITHICCHIP,THEATMELAT89C52ISAPOWERFULMICROCOMPUTERWHICHPROVIDESAHIGHLYFLEXIBLEANDCOSTEFFECTIVESOLUTIONTOMANYEMBEDDEDCONTROLAPPLICATIONSTHEAT89C52PROVIDESTHEFOLLOWINGSTANDARDFEATURES8KBYTESOFFLASH,256BYTESOFRAM,32I/OLINES,THREE16BITTIMER/COUNTERS,ASIXVECTORTWOLEVELINTERRUPTARCHITECTURE,AFULLDUPLEXSERIALPORT,ONCHIPOSCILLATOR,ANDCLOCKCIRCUITRYINADDITION,THEAT89C52ISDESIGNEDWITHSTATICLOGICFOROPERATIONDOWNTOZEROFREQUENCYANDSUPPORTSTWOSOFTWARESELECTABLEPOWERSAVINGMODESTHEIDLEMODESTOPSTHECPUWHILEALLOWINGTHERAM,TIMER/COUNTERS,SERIALPORT,ANDINTERRUPTSYSTEMTOCONTINUEFUNCTIONINGTHEPOWERDOWNMODESAVESTHERAMCONTENTSBUTFREEZESTHEOSCILLATOR,DISABLINGALLOTHERCHIPFUNCTIONSUNTILTHENEXTHARDWARERESETAMAPOFTHEONCHIPMEMORYAREACALLEDTHESPECIALFUNCTIONREGISTERSFRSPACEISSHOWNINTABLE1NOTETHATNOTALLOFTHEADDRESSESAREOCCUPIED,ANDUNOCCUPIEDADDRESSESMAYNOTBEIMPLEMENTEDONTHECHIPREADACCESSESTOTHESEADDRESSESWILLINGENERALRETURNRANDOMDATA,ANDWRITEACCESSESWILLHAVEANINDETERMINATEEFFECTUSERSOFTWARESHOULDNOTWRITE1STOTHESEUNLISTEDLOCATIONS,SINCETHEYMAYBEUSEDINFUTUREPRODUCTSTOINVOKENEWFEATURESINTHATCASE,THERESETORINACTIVEVALUESOFTHENEWBITSWILLALWAYSBE0CONTROLANDSTATUSBITSARECONTAINEDINREGISTERST2CONANDT2MODFORTIMER2THEREGISTERPAIRRCAP2H,RCAP2LARETHECAPTURE/RELOADREGISTERSFORTIMER2IN16BITCAPTUREMODEOR16BITAUTORELOADMODETHEINDIVIDUALINTERRUPTENABLEBITSAREINTHEIEREGISTERTWOPRIORITIESCANBESETFOREACHOFTHESIXINTERRUPTSOURCESINTHEIPREGISTERTHEAT89C52IMPLEMENTS256BYTESOFONCHIPRAMTHEUPPER128BYTESOCCUPYAPARALLELADDRESSSPACETOTHESPECIALFUNCTIONREGISTERSTHATMEANSTHEUPPER128BYTESHAVETHESAMEADDRESSESASTHESFRSPACEBUTAREPHYSICALLYSEPARATEFROMSFRSPACEWHENANINSTRUCTIONACCESSESANINTERNALLOCATIONABOVEADDRESS7FH,THEADDRESSMODEUSEDINTHEINSTRUCTIONSPECIFIESWHETHERTHECPUACCESSESTHEUPPER128BYTESOFRAMORTHESFRSPACEINSTRUCTIONSTHATUSEDIRECTADDRESSINGACCESSSFRSPACEFOREXAMPLE,THEFOLLOWINGDIRECTADDRESSINGINSTRUCTIONACCESSESTHESFRATLOCATION0A0HWHICHISP2MOV0A0H,DATAINSTRUCTIONSTHATUSEINDIRECTADDRESSINGACCESSTHEUPPER128BYTESOFRAMFOREXAMPLE,THEFOLLOWINGINDIRECTADDRESSINGINSTRUCTION,WHERER0CONTAINS0A0H,ACCESSESTHEDATABYTEATADDRESS0A0H,RATHERTHANP2WHOSEADDRESSIS0A0HMOVR0,DATANOTETHATSTACKOPERATIONSAREEXAMPLESOFINDIRECTADDRESSING,SOTHEUPPER128BYTESOFDATARAMAREAVAILABLEASSTACKSPACETIMER0AND1TIMER0ANDTIMER1INTHEAT89C52OPERATETHESAMEWAYASTIMER0ANDTIMER1INTHEAT89C51TIMER2TIMER2ISA16BITTIMER/COUNTERTHATCANOPERATEASEITHERATIMERORANEVENTCOUNTERTHETYPEOFOPERATIONISSELECTEDBYBITC/T2INTHESFRT2CONSHOWNINTABLE2TIMER2HASTHREEOPERATINGMODESCAPTURE,AUTORELOADUPORDOWNCOUNTING,ANDBAUDRATEGENERATORTHEMODESARESELECTEDBYBITSINT2CON,ASSHOWNINTABLE3TIMER2CONSISTSOFTWO8BITREGISTERS,TH2ANDTL2INTHETIMERFUNCTION,THETL2REGISTERISINCREMENTEDEVERYMACHINECYCLESINCEAMACHINECYCLECONSISTSOF12OSCILLATORPERIODS,THECOUNTRATEIS1/12OFTHEOSCILLATORFREQUENCYINTHECOUNTERFUNCTION,THEREGISTERISINCREMENTEDINRESPONSETOALTO0TRANSITIONATITSCORRESPONDINGEXTERNALINPUTPIN,T2INTHISFUNCTION,THEEXTERNALINPUTISSAMPLEDDURINGS5P2OFEVERYMACHINECYCLEWHENTHESAMPLESSHOWAHIGHINONECYCLEANDALOWINTHENEXTCYCLE,THECOUNTISINCREMENTEDTHENEWCOUNTVALUEAPPEARSINTHEREGISTERDURINGS3P1OFTHECYCLEFOLLOWINGTHEONEINWHICHTHETRANSITIONWASDETECTEDSINCETWOMACHINECYCLES24OSCILLATORPERIODSAREREQUIREDTORECOGNIZEA1TO0TRANSITION,THEMAXIMUMCOUNTRATEIS1/24OFTHEOSCILLATORFREQUENCYTOENSURETHATAGIVENLEVELISSAMPLEDATLEASTONCEBEFOREITCHANGES,THELEVELSHOULDBEHELDFORATLEASTONEFULLMACHINECYCLECAPTUREMODEINTHECAPTUREMODE,TWOOPTIONSARESELECTEDBYBITEXEN2INT2CONIFEXEN20,TIMER2ISA16BITTIMERORCOUNTERWHICHUPONOVERFLOWSETSBITTF2INT2CONTHISBITCANTHENBEUSEDTOGENERATEANINTERRUPTIFEXEN21,TIMER2PERFORMSTHESAMEOPERATION,BUTALTO0TRANSITIONATEXTERNALINPUTT2EXALSOCAUSESTHECURRENTVALUEINTH2ANDTL2TOBECAPTUREDINTORCAP2HANDRCAP2L,RESPECTIVELYINADDITION,THETRANSITIONATT2EXCAUSESBITEXF2INT2CONTOBESETTHEEXF2BIT,LIKETF2,CANGENERATEANINTERRUPTTHECAPTUREMODEISILLUSTRATEDINFIGURE1AUTORELOADUPORDOWNCOUNTERTIMER2CANBEPROGRAMMEDTOCOUNTUPORDOWNWHENCONFIGUREDINITS16BITAUTORELOADMODETHISFEATUREISINVOKEDBYTHEDCENDOWNCOUNTERENABLEBITLOCATEDINTHESFRT2MODSEETABLE4UPONRESET,THEDCENBITISSETTO0SOTHATTIMER2WILLDEFAULTTOCOUNTUPWHENDCENISSET,TIMER2CANCOUNTUPORDOWN,DEPENDINGONTHEVALUEOFTHET2EXPINFIGURE2SHOWSTIMER2AUTOMATICALLYCOUNTINGUPWHENDCEN0INTHISMODE,TWOOPTIONSARESELECTEDBYBITEXEN2INT2CONIFEXEN20,TIMER2COUNTSUPTO0FFFFHANDTHENSETSTHETF2BITUPONOVERFLOWTHEOVERFLOWALSOCAUSESTHETIMERREGISTERSTOBERELOADEDWITHTHE16BITVALUEINRCAP2HANDRCAP2LTHEVALUESINRCAP2HANDRCAP2LAREPRESETBYSOFTWAREIFEXEN21,A16BITRELOADCANBETRIGGEREDEITHERBYANOVERFLOWORBYALTO0TRANSITIONATEXTERNALINPUTT2EXTHISTRANSITIONALSOSETSTHEEXF2BITBOTHTHETF2ANDEXF2BITSCANGENERATEANINTERRUPTIFENABLEDSETTINGTHEDCENBITENABLESTIMER2TOCOUNTUPORDOWN,ASSHOWNINFIGURE3INTHISMODE,THET2EXPINCONTROLSTHEDIRECTIONOFTHECOUNTALOGIC1ATT2EXMAKESTIMER2COUNTUPTHETIMERWILLOVERFLOWAT0FFFFHANDSETTHETF2BITTHISOVERFLOWALSOCAUSESTHE16BITVALUEINRCAP2HANDRCAP2LTOBERELOADEDINTOTHETIMERREGISTERS,TH2ANDTL2,RESPECTIVELYALOGIC0ATT2EXMAKESTIMER2COUNTDOWNTHETIMERUNDERFLOWSWHENTH2ANDTL2EQUALTHEVALUESSTOREDINRCAP2HANDRCAP2LTHEUNDERFLOWSETSTHETF2BITANDCAUSES0FFFFHTOBERELOADEDINTOTHETIMERREGISTERSTHEEXF2BITTOGGLESWHENEVERTIMER2OVERFLOWSORUNDERFLOWSANDCANBEUSEDASA17THBITOFRESOLUTIONINTHISOPERATINGMODE,EXF2DOESNOTFLAGANINTERRUPTBAUDRATEGENERATORTIMER2ISSELECTEDASTHEBAUDRATEGENERATORBYSETTINGTCLKAND/ORRCLKINT2CONTABLE2NOTETHATTHEBAUDRATESFORTRANSMITANDRECEIVECANBEDIFFERENTIFTIMER2ISUSEDFORTHERECEIVERORTRANSMITTERANDTIMER1ISUSEDFORTHEOTHERFUNCTIONSETTINGRCLKAND/ORTCLKPUTSTIMER2INTOITSBAUDRATEGENERATORMODE,ASSHOWNINFIGURE4THEBAUDRATEGENERATORMODEISSIMILARTOTHEAUTORELOADMODE,INTHATAROLLOVERINTH2CAUSESTHETIMER2REGISTERSTOBERELOADEDWITHTHE16BITVALUEINREGISTERSRCAP2HANDRCAP2L,WHICHAREPRESETBYSOFTWARETHETIMERCANBECONFIGUREDFOREITHERTIMERORCOUNTEROPERATIONINMOSTAPPLICATIONS,ITISCONFIGUREDFORTIMEROPERATIONCP/T20THETIMEROPERATIONISDIFFERENTFORTIMER2WHENITISUSEDASABAUDRATEGENERATORNORMALLY,ASATIMER,ITINCREMENTSEVERYMACHINECYCLEAT1/12THEOSCILLATORFREQUENCYASABAUDRATEGENERATOR,HOWEVER,ITINCREMENTSEVERYSTATETIMEAT1/2THEOSCILLATORFREQUENCYTIMER2ASABAUDRATEGENERATORISSHOWNINFIGURE4THISFIGUREISVALIDONLYIFRCLKORTCLK1INT2CONNOTETHATAROLLOVERINTH2DOESNOTSETTF2ANDWILLNOTGENERATEANINTERRUPTNOTETOO,THATIFEXEN2ISSET,ALTO0TRANSITIONINT2EXWILLSETEXF2BUTWILLNOTCAUSEARELOADFROMRCAP2H,RCAP2LTOTH2,TL2THUSWHENTIMER2ISINUSEASABAUDRATEGENERATOR,T2EXCANBEUSEDASANEXTRAEXTERNALINTERRUPTNOTETHATWHENTIMER2ISRUNNINGTR21ASATIMERINTHEBAUDRATEGENERATORMODE,TH2ORTL2SHOULDNOTBEREADFROMORWRITTENTOUNDERTHESECONDITIONS,THETIMERISINCREMENTEDEVERYSTATETIME,ANDTHERESULTSOFAREADORWRITEMAYNOTBEACCURATETHERCAP2REGISTERSMAYBEREADBUTSHOULDNOTBEWRITTENTO,BECAUSEAWRITEMIGHTOVERLAPARELOADANDCAUSEWRITEAND/ORRELOADERRORSTHETIMERSHOULDBETURNEDOFFCLEARTR2BEFOREACCESSINGTHETIMER2ORRCAP2REGISTERSPROGRAMMABLECLOCKOUTA50DUTYCYCLECLOCKCANBEPROGRAMMEDTOCOMEOUTONP10,ASSHOWNINFIGURE5THISPIN,BESIDESBEINGAREGULARI/0PIN,HASTWOALTERNATEFUNCTIONSITCANBEPROGRAMMEDTOINPUTTHEEXTERNALCLOCKFORTIMER/COUNTER2ORTOOUTPUTA50DUTYCYCLECLOCKRANGINGFROM61HZTO4MHZATA16MHZOPERATINGFREQUENCYTOCONFIGURETHETIMER/COUNTER2ASACLOCKGENERATOR,BITC/T2T2CON1MUSTBECLEAREDANDBITT2OET2MOD1MUSTBESETBITTR2T2CON2STARTSANDSTOPSTHETIMERTHECLOCKOUTFREQUENCYDEPENDSONTHEOSCILLATORFREQUENCYANDTHERELOADVALUEOFTIMER2CAPTUREREGISTERSRCAP2H,RCAP2LINTHECLOCKOUTMODE,TIMER2ROLLOVERSWILLNOTGENERATEANINTERRUPTTHISBEHAVIORISSIMILARTOWHENTIMER2ISUSEDASABAUDRATEGENERATORITISPOSSIBLETOUSETIMER2ASABAUDRATEGENERATORANDACLOCKGENERATORSIMULTANEOUSLYNOTE,HOWEVER,THATTHEBAUDRATEANDCLOCKOUTFREQUENCIESCANNOTBEDETERMINEDINDEPENDENTLYFROMONEANOTHERSINCETHEYBOTHUSERCAP2HANDRCAP2LUARTTHEUARTINTHEAT89C52OPERATESTHESAMEWAYASTHEUARTINTHEAT89C51INTERRUPTSTHEAT89C52HASATOTALOFSIXINTERRUPTVECTORSTWOEXTERNALINTERRUPTSINT0ANDINT1,THREETIMERINTERRUPTSTIMERS0,1,AND2,ANDTHESERIALPORTINTERRUPTTHESEINTERRUPTSAREALLSHOWNINFIGURE6EACHOFTHESEINTERRUPTSOURCESCANBEINDIVIDUALLYENABLEDORDISABLEDBYSETTINGORCLEARINGABITINSPECIALFUNCTIONREGISTERIEIEALSOCONTAINSAGLOBALDISABLEBIT,EA,WHICHDISABLESALLINTERRUPTSATONCENOTETHATTABLE5SHOWSTHATBITPOSITIONIE6ISUNIMPLEMENTEDINTHEAT89C51,BITPOSITIONIE5ISALSOUNIMPLEMENTEDUSERSOFTWARESHOULDNOTWRITE1STOTHESEBITPOSITIONS,SINCETHEYMAYBEUSEDINFUTUREAT89PRODUCTSTIMER2INTERRUPTISGENERATEDBYTHELOGICALOROFBITSTF2ANDEXF2INREGISTERT2CONNEITHEROFTHESEFLAGSISCLEAREDBYHARDWAREWHENTHESERVICEROUTINEISVECTOREDTOINFACT,THESERVICEROUTINEMAYHAVETODETERMINEWHETHERITWASTF2OREXF2THATGENERATEDTHEINTERRUPT,ANDTHATBITWILLHAVETOBECLEAREDINSOFTWARETHETIMER0ANDTIMER1FLAGS,TF0ANDTFI,ARESETATS5P2OFTHECYCLEINWHICHTHETIMERSOVERFLOWTHEVALUESARETHENPOLLEDBYTHECIRCUITRYINTHENEXTCYCLEHOWEVER,THETIMER2FLAG,TF2,ISSETATS2P2ANDISPOLLEDINTHESAMECYCLEINWHICHTHETIMEROVERFLOWSOSCILLATORCHARACTERISTICSXTAL1ANDXTAL2ARETHEINPUTANDOUTPUT,RESPECTIVELY,OFANINVERTINGAMPLIFIERTHATCANBECONFIGUREDFORUSEASANONCHIPOSCILLATOR,ASSHOWNINFIGURE7EITHERAQUARTZCRYSTALORCERAMICRESONATORMAYBEUSEDTODRIVETHEDEVICEFROMANEXTERNALCLOCKSOURCE,XTAL2SHOULDBELEFTUNCONNECTEDWHILEXTAL1ISDRIVEN,ASSHOWNINFIGURE8THEREARENOREQUIREMENTSONTHEDUTYCYCLEOFTHEEXTERNALCLOCKSIGNAL,SINCETHEINPUTTOTHEINTERNALCLOCKINGCIRCUITRYISTHROUGHADIVIDEBYTWOFLIPFLOP,BUTMINIMUMANDMAXIMUMVOLTAGEHIGHANDLOWTIMESPECIFICATIONSMUSTBEOBSERVEDIDLEMODEINIDLEMODE,THECPUPUTSITSELFTOSLEEPWHILEALLTHEONCHIPPERIPHERALSREMAINACTIVETHEMODEISINVOKEDBYSOFTWARETHECONTENTOFTHEONCHIPRAMANDALLTHESPECIALFUNCTIONSREGISTERSREMAINUNCHANGEDDURINGTHISMODETHEIDLEMODECANBETERMINATEDBYANYENABLEDINTERRUPTORBYAHARDWARERESETNOTETHATWHENIDLEMODEISTERMINATEDBYAHARDWARERESET,THEDEVICENORMALLYRESUMESPROGRAMEXECUTIONFROMWHEREITLEFTOFF,UPTOTWOMACHINECYCLESBEFORETHEINTERNAL
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