HT67F5652 datasheet(24/224 Pages) HOLTEK

24 / 224 page

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HT67F5652

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

HT67F5652

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

0000H

0004H

0034H

1FFFH

Reset

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Program Memory Structure

Special Vectors

WithintheProgramMemory,certainlocationsarereservedfortheresetandinterrupts.Thelocation

0000Hisreservedforusebythedeviceresetforprograminitialisation.Afteradeviceresetis

initiated,theprogramwilljumptothislocationandbeginexecution.

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.

Last Page o�

TBHP Registe�

TBLP Registe�

P�og�a� Me�o�y

Registe� TBLH

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Registe�

Data

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High Byte

Low Byte

Table Program Example

Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfrom

themicrocontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichis

storedthereusingtheORGstatement.ThevalueatthisORGstatementis"1F00H"whichrefersto

thestartaddressofthelastpagewithinthe8KProgramMemoryofthemicrocontroller.Thetable

pointerlowbyteregisterissetupheretohaveaninitialvalueof"06H".Thiswillensurethatthefirst

datareadfromthedatatablewillbeattheProgramMemoryaddress"1F06H"or6locationsafter

thestartofthelastpage.Notethatthevalueforthetablepointerisreferencedtothefirstaddress

specifiedbyTBLPandTBHPifthe"TABRD[m]"instructionisbeingused.Thehighbyteofthe

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