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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/OLines•Three16
2、-bitTimer/Counters•EightInterruptSources•FullDuplexUARTSerialChannel•Low-powerIdleandPower-downModes•InterruptRecoveryfromPower-downMode•WatchdogTimer•DualDataPointer•Power-offFlag•FastProgrammingTime•FlexibleISPProgramming(ByteandPageMode)•Green(Pb/Halide-free)P
3、ackagingOption1.DescriptionTheAT89S52isalow-power,high-performanceCMOS8-bitmicrocontrollerwith8Kbytesofin-systemprogrammableFlashmemory.ThedeviceismanufacturedusingAtmel’shigh-densitynonvolatilememorytechnologyandiscompatiblewiththeindus-try-standard80C51instruct
4、ionsetandpinout.Theon-chipFlashallowstheprogrammemorytobereprogrammedin-systemorbyaconventionalnonvolatilememorypro-grammer.Bycombiningaversatile8-bitCPUwithin-systemprogrammableFlashonamonolithicchip,theAtmelAT89S52isapowerfulmicrocontrollerwhichprovidesahighly-
5、flexibleandcost-effectivesolutiontomanyembeddedcontrolapplications.TheAT89S52providesthefollowingstandardfeatures:8KbytesofFlash,256bytesof12RAM,32I/Olines,Watchdogtimer,twodatapointers,three16-bittimer/counters,asix-vectortwo-levelinterruptarchitecture,afulldupl
6、exserialport,on-chiposcillator,andclockcircuitry.Inaddition,theAT89S52isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheCPUwhileallowingtheRAM,timer/counters,serialport,andinterruptsystemto
7、continuefunctioning.ThePower-downmodesavestheRAMcon-tentsbutfreezestheoscillator,disablingallotherchipfunctionsuntilthenextinterruptorhardwarereset.2.PinDescriptionVCC：Supplyvoltage.GND：Ground.Port0：Port0isan8-bitopendrainbidirectionalI/Oport.Asanoutputport,eachp
8、incansinkeightTTLinputs.When1sarewrittentoport0pins,thepinscanbeusedashigh-impedanceinputs.Port0canalsobeconfiguredtobethemultiplexedlow-orderaddress/databusdu
