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EM78P259N8-BitMicroprocessorwithOTPROMProductSpecificationDOC.VERSION1.4ELANMICROELECTRONICSCORP.January2008TrademarkAcknowledgments:IBMisaregisteredtrademarkandPS/2isatrademarkofIBM.WindowsisatrademarkofMicrosoftCorporation.ELANandELANlogoaretrademarksofELANMicroelectronicsCorporation.Copyright©2005~2008byELANMicroelectronicsCorporationAllRightsReservedPrintedinTaiwanThecontentsofthisspecificationaresubjecttochangewithoutfurthernotice.ELANMicroelectronicsassumesnoresponsibilityconcerningtheaccuracy,adequacy,orcompletenessofthisspecification.ELANMicroelectronicsmakesnocommitmenttoupdate,ortokeepcurrenttheinformationandmaterialcontainedinthisspecification.Suchinformationandmaterialmaychangetoconformtoeachconfirmedorder.InnoeventshallELANMicroelectronicsbemaderesponsibleforanyclaimsattributedtoerrors,omissions,orotherinaccuraciesintheinformationormaterialcontainedinthisspecification.ELANMicroelectronicsshallnotbeliablefordirect,indirect,specialincidental,orconsequentialdamagesarisingfromtheuseofsuchinformationormaterial.Thesoftware(ifany)describedinthisspecificationisfurnishedunderalicenseornondisclosureagreement,andmaybeusedorcopiedonlyinaccordancewiththetermsofsuchagreement.ELANMicroelectronicsproductsarenotintendedforuseinlifesupportappliances,devices,orsystems.UseofELANMicroelectronicsproductinsuchapplicationsisnotsupportedandisprohibited.NOPARTOFTHISSPECIFICATIONMAYBEREPRODUCEDORTRANSMITTEDINANYFORMORBYANYMEANSWITHOUTTHEEXPRESSEDWRITTENPERMISSIONOFELANMICROELECTRONICS.ELANMICROELECTRONICSCORPORATIONHeadquarters:No.12,InnovationRoad1HsinchuScienceParkHsinchu,Taiwan308Tel:+8863563-9977Fax:+8863563-9966(HK)MicroelectronicsCorporation,Ltd.FlatA,19F.,WorldTechCentre95HowMingStreet,KwunTongKowloon,HONGKONGTel:+8522723-3376Fax:+8522723-7780elanhk@emc.com.hkUSA:ElanInformationTechnologyGroup(USA)P.O.Box601Cupertino,CA95015USATel:+1408366-8225Fax:+1408366-8225Shenzhen:ElanMicroelectronicsShenzhen,Ltd.3F,SSMECBldg.,GaoxinS.Ave.IShenzhenHi-techIndustrialPark(SouthArea),ShenzhenCHINA518057Tel:+867552601-0565Fax:+867552601-0500Shanghai:ElanMicroelectronicsShanghai,Ltd.#23,Zone115,Lane572,BiboRd.ZhangjiangHi-TechParkShanghai,CHINA201203Tel:+86215080-3866Fax:+86215080-4600ContentsProductSpecification(V1.4)01.25.2008•iiiContents1GeneralDescription................................................................................................12Features...................................................................................................................13PinAssignment.......................................................................................................24PinDescription........................................................................................................34.1EM78P259ND14/SO14.....................................................................................34.2EM78P259NSO16A..........................................................................................44.3EM78P259ND18/SO18.....................................................................................54.4EM78P259ND20/SO20/SS20...........................................................................65BlockDiagram.........................................................................................................76FunctionDescription..............................................................................................86.1OperationalRegisters.......................................................................................86.1.1R0(IndirectAddressRegister)..........................................................................86.1.2R1(TimeClock/Counter)...................................................................................86.1.3R2(ProgramCounter)andStack.......................................................................86.1.3.1DataMemoryConfiguration...............................................................106.1.4R3(StatusRegister)..........................................................................................116.1.5R4(RAMSelectRegister).................................................................................116.1.6R5~R6(Port5~Port6)..................................................................................126.1.7R7(Port7)........................................................................................................126.1.8R8(AISR:ADCInputSelectRegister).............................................................136.1.9R9(ADCON:ADCControlRegister)................................................................146.1.10RA(ADOC:ADCOffsetCalibrationRegister)..................................................156.1.11RB(ADDATA:ConvertedValueofADC)..........................................................156.1.12RC(ADDATA1H:ConvertedValueofADC).....................................................166.1.13RD(ADDATA1L:ConvertedValueofADC)......................................................166.1.14RE(InterruptStatus