HT68F001 datasheet(13/55 Pages) HOLTEK

13 / 55 page

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HT68F001

Cost-Effective Flash MCU

HT68F001

Cost-Effective Flash MCU

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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

Theinstructionsrelatedtotheimmediatedataareonlyavailableforthe4-bitlownibble.The4-bit

highnibbledatamustbefilledwithavalueof0H.Therefore,todealwiththeoperationwithan

8-bitimmediatedata,thehighnibbledatashouldfirstbeprocessedfollowedbythelownibbledata

togetherwiththeSWAPinstruction.

Toachievethe“MOVA,03CH”operation,thefollowingthreeinstructionsshouldbeexecuted:

MOV A,03H ;Highnibbleimmediatedataprocessedfirst

SWAP ACC

MOV A,0CH

; Low nibble immediate data processed later

Toachievethe“RETA,0C3H”operation,thefollowingthreeinstructionsshouldbeexecuted:

MOV A,0CH ;Highnibbleimmediatedataprocessedfirst

SWAP ACC

RET A,03H

; Low nibble immediate data processed later

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