HT67F5650 datasheet(32/235 Pages) HOLTEK

32 / 235 page

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HT67F5650/HT67F5660

24-Bit Delta Sigma A/D + LCD Flash MCU

HT67F5650/HT67F5660

24-Bit Delta Sigma A/D + LCD Flash MCU

Look-up Table

AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan

storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetupbyplacingtheaddress

ofthelookupdatatoberetrievedinthetablepointerregister,TBLPandTBHP.Theseregisters

definethetotaladdressofthelook-uptable.

Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemoryusing

thecorrespondingtablereadinstructionsuchas"TABRD[m]"or"TABRDL[m]"respectivelywhen

thememory[m]islocatedinsector0.Ifthememory[m]islocatedinothersectors,thedatacanbe

retrievedfromtheprogrammemoryusingthecorrespondingextendedtablereadinstructionsuchas

"LTABRD[m]"or"LTABRDL[m]"respectively.Whentheinstructionisexecuted,thelowerorder

tablebytefromtheProgramMemorywillbetransferredtotheuserdefinedDataMemoryregister[m]

asspecifiedintheinstruction.ThehigherordertabledatabytefromtheProgramMemorywillbe

transferredtotheTBLHspecialregister.

Theaccompanyingdiagramillustratestheaddressingdataflowofthelook-uptable.

Re gi st er T BL H

Us er S el ec te d

Re gi st er

Hi gh B yt eL ow B yt e

La st p age o r

TB HP R egi st er

TB LP R eg is te r

Da ta

16bi ts

Pr og ra m Me mo ry

Table Program Example

Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfromthe

microcontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichisstored

thereusingtheORGstatement.ThevalueatthisORGstatementis"1F00H"whichreferstothe

startaddressofthelastpagewithinthe8KProgramMemoryoftheHT67F5650device.Thetable

pointerlowbyteregisterissetupheretohaveaninitialvalueof"06H".Thiswillensurethatthefirst

datareadfromthedatatablewillbeattheProgramMemoryaddress"1F06H"or6locationsafter

thestartofthelastpage.Notethatthevalueforthetablepointerisreferencedtothefirstaddress

specifiedbyTBLPandTBHPifthe"TABRD[m]"instructionisbeingused.Thehighbyteofthe

tabledatawhichinthiscaseisequaltozerowillbetransferredtotheTBLHregisterautomatically

whenthe"TABRD[m]"instructionisexecuted.

BecausetheTBLHregisterisaread/writeregisterandcanberestored,careshouldbetaken

toensureitsprotectionifboththemainroutineandInterruptServiceRoutineusetableread

instructions.Ifusingthetablereadinstructions,theInterruptServiceRoutinesmaychangethe

valueoftheTBLHandsubsequentlycauseerrorsifusedagainbythemainroutine.Asaruleitis

recommendedthatsimultaneoususeofthetablereadinstructionsshouldbeavoided.However,in

situationswheresimultaneoususecannotbeavoided,theinterruptsshouldbedisabledpriortothe

executionofanymainroutinetable-readinstructions.Notethatalltablerelatedinstructionsrequire

twoinstructioncyclestocompletetheiroperation.

HT67F5650 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

HT67F5650 Datasheet(HTML) 32 Page - Holtek Semiconductor Inc

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