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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3W 데이터시트(PDF) 36 Page - Holtek Semiconductor Inc |
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HT45F3W 데이터시트(HTML) 36 Page - Holtek Semiconductor Inc |
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36 / 167 page  Rev. 1.50 3� De�e��e� 01� �01� Rev. 1.50 37 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU Bank Pointer – BP TheProgramandDataMemoryaredividedintoseveralbanks.SelectingtherequiredProgramand DataMemoryareaisachievedusingtheBankPointer.Bit5oftheBankPointerisusedtoselect ProgramMemoryBanks0~1,whilebits0~2areusedtoselectDataMemoryBanks0~4. TheDataMemoryisinitialisedtoBank0afterareset,exceptforaWDTtime-outresetinthePower DownMode,inwhichcase,theDataMemorybankremainsunaffected.Itshouldbenotedthatthe SpecialFunctionDataMemoryisnotaffectedbythebankselection,whichmeansthattheSpecial FunctionRegisterscanbeaccessedfromwithinanybank.DirectlyaddressingtheDataMemory willalwaysresultinBank0beingaccessedirrespectiveofthevalueoftheBankPointer.Accessing datafrombanksotherthanBank0mustbeimplementedusingIndirectaddressing. AsboththeProgramMemoryandDataMemorysharethesameBankPointerRegister,caremustbe takenduringprogramming. BP Register Bit 7 6 5 4 3 2 1 0 Na�e — — PMBP0 — — DMBP� DMBP1 DMBP0 R/W — — R/W — — R/W R/W R/W POR — — 0 — — 0 0 0 Bit7~6 Unimplemented,readas“0” Bit5 PMBP0:SelectProgramMemoryBanks 0:Bank0,ProgramMemoryAddressisfrom0000H~1FFFH 1:Bank1,ProgramMemoryAddressisfrom2000H~3FFFH Bit4~3 Unimplemented,readas“0” Bit2~0 DMBP2~DMBP0:SelectDataMemoryBanks 000:Bank0 001:Bank1 010:Bank2 011:Bank3 100:Bank4 110~111:Undefined 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. |
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