HT45F5R datasheet(23/138 Pages) HOLTEK

23 / 138 page

Rev. 1.10

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HT45F5R

Charger ASSP Flash MCU

HT45F5R

Charger ASSP Flash MCU

Flash Program Memory

TheProgramMemoryisthelocationwheretheusercodeorprogramisstored.Forthisdevice

theProgramMemoryareFlashtype,whichmeansitcanbeprogrammedandre-programmed

alargenumberoftimes,allowingtheusertheconvenienceofcodemodificationonthesame

device.Byusingtheappropriateprogrammingtools,thisFlashdeviceoffersuserstheflexibilityto

convenientlydebuganddeveloptheirapplicationswhilealsoofferingameansoffieldprogramming

andupdating.

Structure

TheProgramMemoryhasacapacityof4K×16bits.TheProgramMemoryisaddressedbythe

ProgramCounterandalsocontainsdata,tableinformationandinterruptentries.Tabledata,which

canbesetupinanylocationwithintheProgramMemory,isaddressedbyaseparatetablepointer

000H

Initialisation Ve�to�

004H

0FFFH

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0�0H

Program Memory Structure

Special Vectors

WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation

000Hisreservedforusebythisdeviceresetforprograminitialisation.Afteradeviceresetis

initiated,theprogramwilljumptothislocationandbeginexecution.

Look-up Table

AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan

storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetupbyplacingtheaddress

ofthelookupdatatoberetrievedinthetablepointerregister,TBLPandTBHP.Thisregisterdefines

thetotaladdressofthelook-uptable.

Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemoryusing

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

thelowerordertablebytefromtheProgramMemorywillbetransferredtotheuserdefined

DataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledatabytefrom

theProgramMemorywillbetransferredtotheTBLHspecialregister.Anyunusedbitsinthis

transferredhigherorderbytewillbereadas"0".

Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable.

HT45F5R Datasheet(PDF) 23 Page - Holtek Semiconductor Inc

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