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Moteur de recherche de fiches techniques de composants électroniques |
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HT46R068B Fiches technique(PDF) 28 Page - Holtek Semiconductor Inc |
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HT46R068B Fiches technique(HTML) 28 Page - Holtek Semiconductor Inc |
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28 / 135 page  Rev. 1.50 �8 �e���a�� 05� �015 Rev. 1.50 �9 �e���a�� 05� �015 HT46R068B/HT46R069B Enhanced A/D 8-Bit OTP MCU HT46R068B/HT46R069B Enhanced A/D 8-Bit OTP MCU Accumulator – ACC TheAccumulatoriscentraltotheoperationofanymicrocontrollerandiscloselyrelatedwith operationscarriedoutbytheALU.TheAccumulatoristheplacewhereallintermediateresults fromtheALUarestored.WithouttheAccumulatoritwouldbenecessarytowritetheresultof eachcalculationorlogicaloperationsuchasaddition,subtraction,shift,etc.,totheDataMemory resultinginhigherprogrammingandtimingoverheads.Datatransferoperationsusuallyinvolve thetemporarystoragefunctionoftheAccumulator;forexample,whentransferringdatabetween oneuserdefinedregisterandanother,itisnecessarytodothisbypassingthedatathroughthe Accumulatorasnodirecttransferbetweentworegistersispermitted. Program Counter Low Register – PCL Toprovideadditionalprogramcontrolfunctions,thelowbyteoftheProgramCounterismade accessibletoprogrammersbylocatingitwithintheSpecialPurposeareaoftheDataMemory.By manipulatingthisregister,directjumpstootherprogramlocationsareeasilyimplemented.Loading avaluedirectlyintothisPCLregisterwillcauseajumptothespecifiedProgramMemorylocation, however,astheregisterisonly8-bitwide,onlyjumpswithinthecurrentProgramMemorypageare permitted.Whensuchoperationsareused,notethatadummycyclewillbeinserted. Bank Pointer – BP IntheHT46R068BandHT46R069Bdevices,theDataMemoryisdividedintoseveralBanks,from Bank0toBank7.ABankPointerisusedtoselecttherequiredDataMemorybank.Onlydatain Bank0canbedirectlyaddressedasdatainBank1~Bank7mustbeindirectlyaddressedusing MemoryPointerMP1andIndirectAddressingRegisterIAR1.UsingMemoryPointerMP0and IndirectAddressingRegisterIAR0willalwaysaccessdatafromBank0,irrespectiveofthevalue oftheBankPointer.MemoryPointerMP1andIndirectAddressingRegisterIAR1canindirectly addressdataineitherBank0orBank1~Bank7dependinguponthevalueoftheBankPointer. TheDataMemoryisinitialisedtoBank0afterareset,exceptfortheWDTtime-outresetintheIdle/ SleepMode,inwhichcase,theDataMemorybankremainsunaffected.ItshouldbenotedthatSpecial FunctionDataMemoryisnotaffectedbythebankselection,whichmeansthattheSpecialFunction RegisterscanbeaccessedfromwithineitherBank0orBank1~Bank7.DirectlyaddressingtheData MemorywillalwaysresultinBank0beingaccessedirrespectiveofthevalueoftheBankPointer. • HT46R068B Bit 7 6 5 4 3 2 1 0 Name — — PMBP0 — — — DMBP1 DMBP0 R/W — — R/W — — — R/W R/W POR — — 0 — — — 0 0 Bit7~6 unimplemented,readas"0" Bit5 PMBP0:ProgramMemoryBankPointer 0:Bank0 1:Bank1 Bit4~2 unimplemented,readas"0" Bit1,0 DMBP1, DMBP0:DataMemoryBankPointer 00:Bank0 01:Bank1 10:Bank2 11:Bank3 |
Numéro de pièce similaire - HT46R068B_15 |
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Description similaire - HT46R068B_15 |
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