HT46R0042 datasheet(13/83 Pages) HOLTEK

13 / 83 page

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HT46R0042

Cost-Effective A/D 8-Bit OTP MCU

HT46R0042

Cost-Effective A/D 8-Bit OTP MCU

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

• RotationRRA,RR,RRCA,RRC,RLA,RL,RLCA,RLC

• IncrementandDecrementINCA,INC,DECA,DEC

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

Program Memory

TheProgramMemoryisthelocationwheretheusercodeorprogramisstored.Thedeviceis

suppliedwithOne-TimeProgrammable,OTP,memorywhereuserscanprogramtheirapplication

codeintothedevice.Byusingtheappropriateprogrammingtools,OTPdeviceoffersusersthe

flexibilitytofreelydeveloptheirapplicationswhichmaybeusefulduringdebugorforproducts

requiringfrequentupgradesorprogramchanges.

Structure

TheProgramMemoryhasacapacityof2K×15bits.TheProgramMemoryisaddressedbythe

ProgramCounterandalsocontainsdata,tableinformationandinterruptentriesinformation.Table

data,whichcanbesetinanylocationwithintheProgramMemory,isaddressedbyseparatetable

pointerregister.

000H

00�H

010H

01�H

Reset

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Program Memory Structure

Special Vectors

WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation

000Hisreservedforusebythedeviceresetforprograminitialisation.Afteradeviceresetis

initiated,theprogramwilljumptothislocationandbeginexecution.

HT46R0042 Datasheet(PDF) 13 Page - Holtek Semiconductor Inc

HT46R0042 Datasheet(HTML) 13 Page - Holtek Semiconductor Inc

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