HT69F360 datasheet(36/235 Pages) HOLTEK

36 / 235 page

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

Look-up Table

AnylocationwithintheProgramMemorycanbedefinedasalook-uptablewhereprogrammerscan

storefixeddata.Tousethelook-uptable,thetablepointermustfirstbesetupbyplacingtheaddress

ofthelookupdatatoberetrievedinthetablepointerregister,TBLPandTBHP.Theseregisters

definethetotaladdressofthelook-uptable.

Aftersettingupthetablepointer,thetabledatacanberetrievedfromtheProgramMemoryusing

the“TABRD[m]”or“TABRDL[m]”instructionsrespectivelywhenthememory[m]islocated

inSector0.Ifthememory[m]islocatedinotherSectors,thedatacanberetrievedfromthe

programmemoryusingthe“LTABRD[m]”or“LTABRDL[m]”instructionsrespectively.Whenthe

instructionisexecuted,thelowerordertablebytefromtheProgramMemorywillbetransferredto

theuserdefinedDataMemoryregister[m]asspecifiedintheinstruction.Thehigherordertabledata

bytefromtheProgramMemorywillbetransferredtotheTBLHspecialregister.

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

TB LP R eg is te r

Da ta

16 b it s

Pr og ra m Me mo ry

Las t p age o r

TB HP R egi st er

Table Program Example

Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfrom

themicrocontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichis

storedthereusingtheORGstatement.ThevalueatthisORGstatementis“1F00H”whichrefers

tothestartaddressofthelastpagewithinthe8KwordsProgramMemoryoftheHT69F350.The

tablepointerissetupheretohaveaninitialvalueof“06H”.Thiswillensurethatthefirstdataread

fromthedatatablewillbeattheProgramMemoryaddress“1F06H”or6locationsafterthestartof

thespecifiedpage.Notethatthevalueforthetablepointerisreferencedtothefirstaddressofthe

presentpageifthe“TABRD[m]”instructionisbeingused.Thehighbyteofthetabledatawhichin

thiscaseisequaltozerowillbetransferredtotheTBLHregisterautomaticallywhenthe“TABRD

[m]”instructionisexecuted.

BecausetheTBLHregisterisaread/writeregisterandcanberestored,careshouldbetaken

toensureitsprotectionifboththemainroutineandInterruptServiceRoutineusetableread

instructions.Ifusingthetablereadinstructions,theInterruptServiceRoutinesmaychangethe

valueoftheTBLHandsubsequentlycauseerrorsifusedagainbythemainroutine.Asaruleitis

recommendedthatsimultaneoususeofthetablereadinstructionsshouldbeavoided.However,in

situationswheresimultaneoususecannotbeavoided,theinterruptsshouldbedisabledpriortothe

executionofanymainroutinetable-readinstructions.Notethatalltablerelatedinstructionsrequire

twoinstructioncyclestocompletetheiroperation.

HT69F360 データシート(PDF) 36 Page - Holtek Semiconductor Inc

HT69F360 データシート(HTML) 36 Page - Holtek Semiconductor Inc

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