HT45F12 datasheet(21/104 Pages) HOLTEK

21 / 104 page

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HT45F12

8-Bit Flash MCU with Op Amps & Comparators

HT45F12

8-Bit Flash MCU with Op Amps & Comparators

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

Las t p age o r

TB HP R egi st er

TB LP R eg is te r

Da ta

15 b it s

Pr og ra m Me mo ry

Instruction

Table location

TABRDC [�]

PC9

PC8

@�

TABRDL [�]

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Table Location

Note:b9~b0:Tablelocationbits

PC9~PC8:CurrentProgramCounterbits

@7~@0:TablePointerTBLPbits

Table Program Example

Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfromthe

microcontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichisstored

thereusingtheORGstatement.ThevalueatthisORGstatementis“300H”whichreferstothestart

addressofthelastpagewithinthe1KwordsProgramMemoryofthedevice.Thetablepointeris

setupheretohaveaninitialvalueof“06H”.Thiswillensurethatthefirstdatareadfromthedata

tablewillbeattheProgramMemoryaddress“306H”or6locationsafterthestartofthelastpage.

Notethatthevalueforthetablepointerisreferencedtothefirstaddressofthepresentpageifthe

“TABRDC[m]”instructionisbeingused.Thehighbyteofthetabledatawhichinthiscaseisequal

tozerowillbetransferredtotheTBLHregisterautomaticallywhenthe“TABRDL[m]”instruction

isexecuted.

BecausetheTBLHregisterisaread-onlyregisterandcannotberestored,careshouldbetaken

toensureitsprotectionifboththemainroutineandInterruptServiceRoutineusetableread

instructions.Ifusingthetablereadinstructions,theInterruptServiceRoutinesmaychangethe

valueoftheTBLHandsubsequentlycauseerrorsifusedagainbythemainroutine.Asaruleitis

recommendedthatsimultaneoususeofthetablereadinstructionsshouldbeavoided.However,in

situationswheresimultaneoususecannotbeavoided,theinterruptsshouldbedisabledpriortothe

executionofanymainroutinetable-readinstructions.Notethatalltablerelatedinstructionsrequire

twoinstructioncyclestocompletetheiroperation.

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