HT82B42R datasheet(18/86 Pages) HOLTEK

18 / 86 page

Rev. 1.00

October 27, 2011

Rev. 1.00

October 27, 2011

HT82B42R/HT82B42RE

I/O MCU with USB Interface

operation.Theseareasmayfunctionasnormalprogrammemorydependingontherequirements.

OnceTBHPisenabled,theinstruction"TABRDC[m]"readstheProgramMemorydataasdefined

bytheTBLPandTBHPvalues.IftheProgramMemorycodeoptionhasdisabledTBHP,the

instruction"TABRDC[m]"readstheProgramMemorydataasdefinedbyTBLPonlyinthecurrent

ProgramMemorypage.

Look-up Table

AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan

storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetupbyplacingthelower

orderaddressofthelookupdatatoberetrievedintheTBLPregisterandthehigherorderaddressin

theTBHPregister.Thesetworegistersdefinethefulladdressofthelook-uptable.UsingtheTBHP

mustbeselectedbyconfigurationoption,ifnotusedtabledatacanstillbeaccessedbutonlythe

lowerbyteaddressinthecurrentpageorlastpagecanbedefined.

Aftersettingupthetablepointers,thetabledatacanberetrievedfromthecurrentProgramMemory

pageorlastProgramMemorypageusingthe"TABRDC[m]"or"TABRDL[m]"instructions,

respectively.Whentheseinstructionsareexecuted,thelowerordertablebytefromtheProgram

MemorywillbetransferredtotheuserdefinedDataMemoryregister[m]asspecifiedinthe

instruction.ThehigherordertabledatabytefromtheProgramMemorywillbetransferredtothe

TBLHspecialregister.Anyunusedbitsinthistransferredhigherorderbytewillbereadas"0".

Pr og ra m

Me mo ry

P r ogr am C ount er

H i gh By te

TB LP

TB LH

Sp ec if ie d by [ m]

T abl e Co nt en ts H i gh By te

T abl e Co nt en ts L ow B yt e

Table Read – TBLP only

Pr og ra m

Me mo ry

TB LH

Sp ec if ie d by [ m]

Hi gh B yt e of T abl e Co nt en ts

Lo w By te o f T abl e Co nt en ts

TB LP

TB HP

Table Read – TBLP/TBHP

Instruction

Table Location Bits

b11

b10

TABRDC [m] PC11 PC10 PC9 PC8

TABRDL [m]

Table Location

Note:PC11~PC8:CurrentProgramCounterbits.TBHPregisterBit3~0whenTBHPisenabled.

@7~@0:TablePointerTBLPbits

TableHighBytePointerforCurrentTableReadTBHP(Address0X1F)

Bits

Read/Write

Functions

TBHP(0X1F)

3~0

R/W

Store current table read bit11~bit8 data

HT82B42R Datasheet(PDF) 18 Page - Holtek Semiconductor Inc

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