1、(PEROM).devicemanufacturedusingAtmelshigh-densitynonvolatiletechnologycompatibletheindustry-standardMCS-51instructionsetpinout.on-chipallowsprogramtobereprogrammedin-systemorbyconventionalprogrammer.BycombiningversatileCPUonmonolithicchip,Atmelpowerfulwhichprovideshighly-flexiblecost-effectivesoluti
2、onmanyembeddedcontrolapplications. Functioncharacteristic:followingstandardfeatures:Flash,128RAM,32I/Olines,two16-bittimer/counters,fivevectortwo-levelinterruptarchitecture,fullduplexserialport,oscillatorclockcircuitry.Inaddition,designedstaticlogicforoperationdownzerofrequencysupportssoftwareselect
3、ablepowersavingmodes.IdleModestopswhileallowingportsystemcontinuefunctioning.Power-downsavesRAMcontentsbutfreezesdisablingallotherchipfunctionsuntilnexthardwarereset.PinVCC:Supplyvoltage.GND:Ground.Port0:0anopen-drainbi-directionalport.AsoutputeachpincansinkeightTTLinputs.When1sarewrittenpins,pinsus
4、edashighimpedanceinputs.Portmayalsoconfiguredmultiplexedloworderaddress/databusduringaccessesexternaldatamemory.thismodeP0hasinternalpullups.Portreceivescodeprogramming,andoutputsprogramverification.Externalpullupsrequired1:1pullups.Thebufferssink/sourcefourinputs.Whentheypulledhighinputs,Portthatex
5、ternallybeinglowwillsourcecurrent(IIL)becauselow-orderaddressprogrammingverification.2:2 8 bycurrent,emitshigh-orderbytefetchesfromuseaddresses.application,itusesstrongpullupswhenemitting1s.Duringaddresses,P2SpecialRegister.Portbitssomesignals3:3servesvariousspecialfeatureslistedbelow:Port PinAltren
6、ate FunctionsP3.0RXD(seral input Port)P3.1TXD(seral output Port)P3.2INT0(external interrupt 0)P3.3INT1(external interrupt 1)P3.4T0(time 0 external input)P3.5T1(time 1 external input)P3.6WR(external data memory write strobe)P3.7RD(external data memory read strobe)verification.RST:Resetinput.Amachinec
7、yclesrunningresetsdevice.ALE/PROG:AddressLatchEnablepulselatchingThisinput(PROG)programming.InnormalALEemittedatconstantrate1/6frequency,timingclockingpurposes.Note,however,oneskippedaccessDataMemory.Ifdesired,disabledsettingbitSFRlocation8EH.With set,activeMOVXMOVCinstruction.Otherwise,weaklyhigh.SettingALE-disablenoeffectifmic
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