HT46R003B datasheet(13/76 Pages) HOLTEK

13 / 76 page

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HT46R003B

Cost-Effective A/D 8-bit OTP MCU

HT46R003B

Cost-Effective A/D 8-bit OTP MCU

Program Memory

TheProgramMemoryisthelocationwheretheusercodeorprogramisstored.Thedeviceis

suppliedwithOne-TimeProgrammable,OTP,memorywhereuserscanprogramtheirapplication

codeintothedevice.Byusingtheappropriateprogrammingtools,OTPdeviceoffersusersthe

flexibilitytofreelydeveloptheirapplicationswhichmaybeusefulduringdebugorforproducts

requiringfrequentupgradesorprogramchanges.

Structure

TheProgramMemoryhasacapacityof1K×14bits.TheProgramMemoryisaddressedbythe

ProgramCounterandalsocontainsdata,tableinformationandinterruptentriesinformation.Table

data,whichcanbesetinanylocationwithintheProgramMemory,isaddressedbyseparatetable

pointerregister.

000H

Initialisation Vector

00�H

3FFH

1� bits

Interr�pt Vectors

010H

Look-�p Table

n00H

nFFH

Program Memory Structure

Special Vectors

WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation

000Hisreservedforusebythedeviceresetforprograminitialisation.Afteradeviceresetis

initiated,theprogramwilljumptothislocationandbeginexecution.

Look-up Table

AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan

storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetbyplacingtheaddress

ofthelookupdatatoberetrievedinthetablepointerregister,TBLP.Thisregisterdefinesthetotal

addressofthelook-uptable.

Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemory

usingthe“TABRDC[m]”or“TABRDL[m]”instructions,respectively.Whentheinstructionis

executed,thelowerordertablebytefromtheProgramMemorywillbetransferredtotheuser

definedDataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledatabyte

fromtheProgramMemorywillbetransferredtotheTBLHspecialregister.Anyunusedbitsinthis

transferredhigherorderbytewillbereadas“0”.

Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable.

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