HT45FM2C datasheet(27/171 Pages) HOLTEK

27 / 171 page

Rev. 1.10

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Rev. 1.10

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HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

Preliminar�

Bank Pointer – BP

TheDataMemoryisdividedintotwobanks.SelectingtheDataMemoryareaisachievedusingthe

BankPointer.Bit0oftheBankPointerisusedtoselectDataMemoryBanks0or1.

TheDataMemoryisinitialisedtoBank0afterareset,exceptforaWDTtime-outresetinthe

PowerDownMode,inwhichcase,theDataMemorybankremainsunaffected.Directlyaddressing

theDataMemorywillalwaysresultinBank0beingaccessedirrespectiveofthevalueofthe

BankPointer.AccessingdatafrombanksotherthanBank0mustbeimplementedusingIndirect

addressing.

BP Register

Bit

Name

—

D�BP0

R/W

—

R/W

POR

—

Bit7~1

Unimplemented,readas“0”

Bit 0

DMBP0:

SelectDataMemoryBanks

0: Bank 0

1: Bank 1

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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