HT66F0176 datasheet(22/165 Pages) HOLTEK

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Rev. 1.20

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Rev. 1.20

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HT66F0176

A/D Flash MCU with EEPROM

HT66F0176

A/D Flash MCU with EEPROM

Stack

Pointer

Stack Level 2

Stack Level 1

Stack Level 3

Stack Level �

Pro�ram Memory

Pro�ram Co�nter

Bottom of Stack

Top 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

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