HT45F3230 datasheet(21/148 Pages) HOLTEK

21 / 148 page

Rev. 1.00

January 13, 2017

Rev. 1.00

January 13, 2017

HT45F3230

IR Sensing/Motor Driving Flash MCU

HT45F3230

IR Sensing/Motor Driving Flash MCU

Flash Program Memory

TheProgramMemoryisthelocationwheretheusercodeorprogramisstored.Forthedevicethe

ProgramMemoryisFlashtype,whichmeansitcanbeprogrammedandre-programmedalarge

numberoftimes,allowingtheusertheconvenienceofcodemodificationonthesamedevice.By

usingtheappropriateprogrammingtools,theFlashdeviceoffersuserstheflexibilitytoconveniently

debuganddeveloptheirapplicationswhilealsoofferingameansoffieldprogrammingand

updating.

Structure

TheProgramMemoryhasacapacityof2K×16bits.TheProgramMemoryisaddressedbythe

ProgramCounterandalsocontainsdata,tableinformationandinterruptentries.Tabledata,which

canbesetupinanylocationwithintheProgramMemory,isaddressedbyaseparatetablepointer

000H

Initialisation Vector

004H

7FFH

16 bits

Interrupt Vectors

03CH

Look-up Table

n00H

nFFH

Program Memory Structure

Special Vectors

WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation

000Hisreservedforusebythedeviceresetforprograminitialisation.Afteradeviceresetis

initiated,theprogramwilljumptothislocationandbeginexecution.

Look-up Table

AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan

storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetupbyplacingtheaddress

ofthelookupdatatoberetrievedinthetablepointerregister,TBLPandTBHP.Theseregisters

definethetotaladdressofthelook-uptable.

Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemoryusing

the“TABRD[m]”or“TABRDL[m]”instructions,respectively.Whentheinstructionisexecuted,

thelowerordertablebytefromtheProgramMemorywillbetransferredtotheuserdefined

DataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledatabytefrom

theProgramMemorywillbetransferredtotheTBLHspecialregister.Anyunusedbitsinthis

transferredhigherorderbytewillbereadas0.

Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable.

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