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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F5R 데이터시트(PDF) 30 Page - Holtek Semiconductor Inc |
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HT45F5R 데이터시트(HTML) 30 Page - Holtek Semiconductor Inc |
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30 / 138 page  Rev. 1.10 �0 De�e��e� 1�� �01� Rev. 1.10 �1 De�e��e� 1�� �01� HT45F5R Charger ASSP Flash MCU HT45F5R Charger ASSP Flash MCU Bank Pointer – BP Forthisdevice,theDataMemoryisdividedintotwobanks,Bank0andBank1.Selectingthe requiredDataMemoryareaisachievedusingtheBankPointer.Bit0oftheBankPointerisusedto selectDataMemoryBanks0~1. TheDataMemoryisinitialisedtoBank0afterareset,exceptforaWDTtime-outresetinthe PowerDownMode,inwhichcase,theDataMemorybankremainsunaffected.Directlyaddressing theDataMemorywillalwaysresultinBank0beingaccessedirrespectiveofthevalueoftheBank Pointer.AccessingdatafromBank1mustbeimplementedusingIndirectAddressing. BP Register Bit 7 6 5 4 3 2 1 0 Na�e — — — — — — — DMBP0 R/W — — — — — — — R/W POR — — — — — — — 0 Bit7~1 Unimplemented,readas"0" Bit0 DMBP0:SelectDataMemoryBanks 0:Bank0 1:Bank1 Accumulator – ACC TheAccumulatoriscentraltotheoperationofanymicrocontrollerandiscloselyrelatedwith operationscarriedoutbytheALU.TheAccumulatoristheplacewhereallintermediateresults fromtheALUarestored.WithouttheAccumulatoritwouldbenecessarytowritetheresultof eachcalculationorlogicaloperationsuchasaddition,subtraction,shift,etc.,totheDataMemory resultinginhigherprogrammingandtimingoverheads.Datatransferoperationsusuallyinvolve thetemporarystoragefunctionoftheAccumulator;forexample,whentransferringdatabetween oneuser-definedregisterandanother,itisnecessarytodothisbypassingthedatathroughthe Accumulatorasnodirecttransferbetweentworegistersispermitted. Program Counter Low Register – PCL Toprovideadditionalprogramcontrolfunctions,thelowbyteoftheProgramCounterismade accessibletoprogrammersbylocatingitwithintheSpecialPurposeareaoftheDataMemory.By manipulatingthisregister,directjumpstootherprogramlocationsareeasilyimplemented.Loading avaluedirectlyintothisPCLregisterwillcauseajumptothespecifiedProgramMemorylocation, however,astheregisterisonly8-bitwide,onlyjumpswithinthecurrentProgramMemorypageare permitted.Whensuchoperationsareused,notethatadummycyclewillbeinserted. Look-up Table Registers – TBLP, TBHP, TBLH Thesethreespecialfunctionregistersareusedtocontroloperationofthelook-uptablewhichis storedintheProgramMemory.TBLPandTBHParethetablepointersandindicatethelocation wherethetabledataislocated.Theirvaluemustbesetupbeforeanytablereadcommandsare executed.Theirvaluecanbechanged,forexampleusingthe"INC"or"DEC"instructions,allowing foreasytabledatapointingandreading.TBLHisthelocationwherethehighorderbyteofthetable dataisstoredafteratablereaddatainstructionhasbeenexecuted.Notethatthelowerordertable databyteistransferredtoauserdefinedlocation. |
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