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HT46R003B データシート(PDF) 13 Page - Holtek Semiconductor Inc

部品番号 HT46R003B
部品情報  Cost-Effective A/D 8-bit OTP MCU
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R003B データシート(HTML) 13 Page - Holtek Semiconductor Inc

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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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