HT67F4892 datasheet(22/188 Pages) HOLTEK

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HT67F4892

Enhanced A/D Flash MCU with LCD & EEPROM

HT67F4892

Enhanced A/D Flash MCU with LCD & EEPROM

Stack

Pointe�

Stack Level �

Stack Level 1

Stack Level 3

Stack Level 8

P�og�a�

Me�o�y

P�og�a� Counte�

Botto� of Stack

Top of Stack

Ifthestackisfullandanenabledinterrupttakesplace,theinterruptrequestflagwillberecorded

buttheacknowledgesignalwillbeinhibited.WhentheStackPointerisdecremented,byRETor

RETI,theinterruptwillbeserviced.Thisfeaturepreventsstackoverflowallowingtheprogrammer

tousethestructuremoreeasily.However,whenthestackisfull,aCALLsubroutineinstructioncan

stillbeexecutedwhichwillresultinastackoverflow.Precautionsshouldbetakentoavoidsuch

caseswhichmightcauseunpredictableprogrambranching.Ifthestackisoverflow,thefirstProgram

Countersaveinthestackwillbelost.

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

LADD,LADDM,LADC,LADCM,LSUB,LSUBM,LSBC,LSBCM,LDAA

• Logicoperations:

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

LAND,LANDM,LOR,LORM,LXOR,LXORM,LCPL,LCPLA

• Rotation:

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

LRR,LRRA,LRRCA,LRRC,LRLA,LRL,LRLCA,LRLC

• IncrementandDecrement:

INCA,INC,DECA,DEC,LINCA,LINC,LDECA,LDEC

• Branchdecision:

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

LSNZ,LSZ,LSZA,LSIZ,LSIZA,LSDZ,LSDZA

HT67F4892 Datasheet(PDF) 22 Page - Holtek Semiconductor Inc

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