HT45F56 datasheet(15/90 Pages) HOLTEK

15 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

Flash Program Memory

TheProgramMemoryisthelocationwheretheusercodeorprogramisstored.Forthedevicethe

ProgramMemoryisFlashtype,whichmeansitcanbeprogrammedandre-programmedalarge

numberoftimes,allowingtheusertheconvenienceofcodemodificationonthesamedevice.

Byusingtheappropriateprogrammingtools,theseFlashdevicesofferuserstheflexibilityto

convenientlydebuganddeveloptheirapplicationswhilealsoofferingameansoffieldprogramming

andupdating.

Structure

TheProgramMemoryhasacapacityof1K×14bits.TheProgramMemoryisaddressedbythe

ProgramCounterandalsocontainsdata,tableinformationandinterruptentries.Tabledata,which

canbesetupinanylocationwithintheProgramMemory,isaddressedbyaseparatetablepointer

registers.

000H

004H

01CH

n00H

nFFH

Initialisation Vector

14 bits

Interrupt Vectors

Look-up Table

020H

3FFH

Program Memory Structure

Special Vectors

WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation

000Hisreservedforusebythesedevicesresetforprograminitialisation.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]”instructionsrespectively.Whentheinstructionisexecuted,

thelowerordertablebytefromtheProgramMemorywillbetransferredtotheuserdefined

DataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledatabytefrom

theProgramMemorywillbetransferredtotheTBLHspecialregister.Anyunusedbitsinthis

transferredhigherorderbytewillbereadas“0”.

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