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1、AT89S52Features•CompatiblewithMCS-51Products•8KBytesofIn-SystemProgrammable(ISP)FlashMemory–Endurance:10,000Write/EraseCycles•4.0Vto5.5VOperatingRange•FullyStaticOperation:0Hzto33MHz•Three-levelProgramMemoryLock•256x8-bitInternalRAM•32ProgrammableI/OLi
2、nes•Three16-bitTimer/Counters•EightInterruptSources•FullDuplexUARTSerialChannel•Low-powerIdleandPower-downModes•InterruptRecoveryfromPower-downMode•WatchdogTimer•DualDataPointer•Power-offFlag•FastProgrammingTime•FlexibleISPProgramming(ByteandPageMode)•
3、Green(Pb/Halide-free)PackagingOption1.DescriptionTheAT89S52isalow-power,high-performanceCMOS8-bitmicrocontrollerwith8Kbytesofin-systemprogrammableFlashmemory.ThedeviceismanufacturedusingAtmel’shigh-densitynonvolatilememorytechnologyandiscompatiblewitht
4、heindus-try-standard80C51instructionsetandpinout.Theon-chipFlashallowstheprogrammemorytobereprogrammedin-systemorbyaconventionalnonvolatilememorypro-grammer.Bycombiningaversatile8-bitCPUwithin-systemprogrammableFlashonamonolithicchip,theAtmelAT89S52isa
5、powerfulmicrocontrollerwhichprovidesahighly-flexibleandcost-effectivesolutiontomanyembeddedcontrolapplications.TheAT89S52providesthefollowingstandardfeatures:8KbytesofFlash,256bytesofRAM,32I/Olines,Watchdogtimer,twodatapointers,three16-bittimer/counter
6、s,asix-vectortwo-levelinterruptarchitecture,afullduplexserialport,on-chiposcillator,andclockcircuitry.Inaddition,theAT89S52isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheCPUwh
7、ileallowingtheRAM,timer/counters,serialport,andinterruptsystemtocontinuefunctioning.ThePower-downmodesavestheRAMcon-tentsbutfreezestheoscillator,disablingallotherchipfunctionsuntilthenextinterruptorhardwarereset.1.PinDescription2.1VCC：Supplyvoltage.2.2
8、GND：Ground.2.3Port0：Port0isan8-bitopendrainbidirectionalI/Oport.Asanoutputport,eachpincansinkeightTTLinputs.When1sarewrittentoport0pins,thepinscanbeusedashigh-impedanceinputs.Port0canalsobeconfiguredtobethemultiplexedlow-orderaddress/da
