HT45F5R datasheet(30/138 Pages) HOLTEK

30 / 138 page

Rev. 1.10

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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

Na�e

—

DMBP0

R/W

—

R/W

POR

—

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.

HT45F5R Datasheet(PDF) 30 Page - Holtek Semiconductor Inc

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