單片機89c52中英文對照翻譯(經(jīng)典版)_第1頁
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1、AT89C52internalstructureanalysisDeionTheAT89S52isalowpowerhighperfmanceCMOS8bitmicrocontrollerwith8KbytesofinsystemprogrammableFlashmemy.ThedeviceismanufacturedusingAtmel’shighdensitynonvolatilememytechnologyiscompatible

2、withtheindustrystard80C51instructionsetpinout.TheonchipFlashallowstheprogrammemytobereprogrammedinsystembyaconventionalnonvolatilememyprogrammer.Bycombiningaversatile8bitCPUwithinsystemprogrammableFlashonamonolithicchipt

3、heAtmelAT89S52isapowerfulmicrocontrollerwhichprovidesahighlyflexiblecosteffectivesolutiontomanyembeddedcontrolapplications.TheAT89S52providesthefollowingstardfeatures:8KbytesofFlash256bytesofRAM32IOlinesWatchdogtimertwod

4、atapointersthree16bittimercountersasixvecttwolevelinterruptarchitectureafullduplexserialptonchiposcillatclockcircuitry.InadditiontheAT89S52isdesignedwithstaticlogicfoperationdowntozerofrequencysupptstwosoftwareablepowers

5、avingmodes.TheIdleModestopstheCPUwhileallowingtheRAMtimercountersserialptinterruptsystemtocontinuefunctioning.ThePowerdownmodesavestheRAMcontentsbutfreezestheoscillatdisablingallotherchipfunctionsuntilthenextinterrupthar

6、dwarereset.PinDeionVCCSupplyvoltage.GNDGround.Pt0Pt0isan8bitopendrainbidirectionalIOpt.AsanoutputpteachpincansinkeightTTLinputs.When1sarewrittentopt0pinsthepinscanbeusedasfollowingtable.Pt3alsoreceivessomecontrolsignalsf

7、Flashprogrammingverification.RSTResetinput.Ahighonthispinftwomachinecycleswhiletheoscillatisrunningresetsthedevice.ThispindrivesHighf96oscillatperiodsaftertheWatchdogtimesout.TheDISRTObitinSFRAUXR(address8EH)canbeusedtod

8、isablethisfeature.InthedefaultstateofbitDISRTOtheRESETHIGHoutfeatureisenabled.ALEPROGAddressLatchEnable(ALE)isanoutputpulseflatchingthelowbyteoftheaddressduringaccessestoexternalmemy.Thispinisalsotheprogrampulseinput(PRO

9、G)duringFlashprogramming.InnmaloperationALEisemittedataconstantrateof16theoscillatfrequencymaybeusedfexternaltimingclockingpurposes.NotehoweverthatoneALEpulseisskippedduringeachaccesstoexternaldatamemy.IfdesiredALEoperat

10、ioncanbedisabledbysettingbit0ofSFRlocation8EH.WiththebitsetALEisactiveonlyduringaMOVXMOVCinstruction.Otherwisethepinisweaklypulledhigh.SettingtheALEdisablebithasnoeffectifthemicrocontrollerisinexternalexecutionmode.PSENP

11、rogramSteEnable(PSEN)isthereadstrobetoexternalprogrammemy.WhentheAT89S52isexecutingcodefromexternalprogrammemyPSENisactivatedtwiceeachmachinecycleexceptthattwoPSENactivationsareskippedduringeachaccesstoexternaldatamemy.E

12、AVPPExternalAccessEnable.EAmustbestrappedtoGNDindertoenablethedevicetofetchcodefromexternalprogrammemylocationsstartingat0000HuptoFFFFH.Notehoweverthatiflockbit1isprogrammedEAwillbeinternallylatchedonreset.EAshouldbestra

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