HT45F5Q-2 datasheet(17/117 Pages) HOLTEK

17 / 117 page

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HT45F5Q-2

Charger Flash MCU

HT45F5Q-2

Charger Flash MCU

Stack

ThisisaspecialpartofthememorywhichisusedtosavethecontentsoftheProgramCounter

only.Thestackisorganizedinto6levelsandneitherpartofthedatanorpartoftheprogramspace,

andisneitherreadablenorwriteable.TheactivatedlevelisindexedbytheStackPointer,andis

neitherreadablenorwriteable.Atasubroutinecallorinterruptacknowledgesignal,thecontentsof

theProgramCounterarepushedontothestack.Attheendofasubroutineoraninterruptroutine,

signaledbyareturninstruction,RETorRETI,theProgramCounterisrestoredtoitspreviousvalue

fromthestack.Afteradevicereset,theStackPointerwillpointtothetopofthestack.

Ifthestackisfullandanenabledinterrupttakesplace,theinterruptrequestflagwillberecordedbut

theacknowledgesignalwillbeinhibited.WhentheStackPointerisdecremented,byRETorRETI,

theinterruptwillbeserviced.Thisfeaturepreventsstackoverflowallowingtheprogrammertouse

thestructuremoreeasily.However,whenthestackisfull,aCALLsubroutineinstructioncanstill

beexecutedwhichwillresultinastackoverflow.Precautionsshouldbetakentoavoidsuchcases

whichmightcauseunpredictableprogrambranching.

Ifthestackisoverflow,thefirstProgramCountersaveinthestackwillbelost.

Stack

Pointer

Stack Leve� �

Stack Leve� 1

Stack Leve� 3

Stack Leve� �

Program Memor�

Program Co�nter

Bottom of Stack

Arithmetic and Logic Unit – ALU

Thearithmetic-logicunitorALUisacriticalareaofthemicrocontrollerthatcarriesoutarithmetic

andlogicoperationsoftheinstructionset.Connectedtothemainmicrocontrollerdatabus,theALU

receivesrelatedinstructioncodesandperformstherequiredarithmeticorlogicaloperationsafter

whichtheresultwillbeplacedinthespecifiedregister.AstheseALUcalculationoroperationsmay

resultincarry,borroworotherstatuschanges,thestatusregisterwillbecorrespondinglyupdatedto

reflectthesechanges.TheALUsupportsthefollowingfunctions:

• Arithmeticoperations:

ADD,ADDM,ADC,ADCM,SUB,SUBM,SBC,SBCM,DAA,

• Logicoperations:

AND,OR,XOR,ANDM,ORM,XORM,CPL,CPLA,

• Rotation:

RRA,RR,RRCA,RRC,RLA,RL,RLCA,RLC,

• IncrementandDecrement:

INCA,INC,DECA,DEC,

• Branchdecision:

JMP,SZ,SZA,SNZ,SIZ,SDZ,SIZA,SDZA,CALL,RET,RETI

HT45F5Q-2 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc

HT45F5Q-2 Datasheet(HTML) 17 Page - Holtek Semiconductor Inc

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