HT45F5Q datasheet(20/114 Pages) HOLTEK

20 / 114 page

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HT45F5Q

Charger Flash MCU

HT45F5Q

Charger Flash MCU

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

PC H ig h By te

TB LP R eg is te r

Da ta

14bi ts

Pr og ra m Me mo ry

Las t p age o r

pr es en t pag e

PC 10 ~P C8

Table Program Example

Thefollowingexampleshowshowthetablepointerandtabledataisdefinedandretrievedfromthe

microcontroller.ThisexampleusesrawtabledatalocatedintheProgramMemorywhichisstored

thereusingtheORGstatement.ThevalueatthisORGstatementis“700H”whichreferstothestart

addressofthelastpagewithinthe2KwordsProgramMemoryofthedevice.Thetablepointerissetup

heretohaveaninitialvalueof“06H”.Thiswillensurethatthefirstdatareadfromthedatatablewill

beattheProgramMemoryaddress“706H”or6locationsafterthestartofthelastpage.Notethatthe

valueforthetablepointerisreferencedtothefirstaddressofthepresentpageifthe“TABRDC[m]”

instructionisbeingused.Thehighbyteofthetabledatawhichinthiscaseisequaltozerowillbe

transferredtotheTBLHregisterautomaticallywhenthe“TABRDC[m]”instructionisexecuted.

BecausetheTBLHregisterisaread-onlyregisterandcannotberestored,careshouldbetaken

toensureitsprotectionifboththemainroutineandInterruptServiceRoutineusetableread

instructions.Ifusingthetablereadinstructions,theInterruptServiceRoutinesmaychangethe

valueoftheTBLHandsubsequentlycauseerrorsifusedagainbythemainroutine.Asaruleitis

recommendedthatsimultaneoususeofthetablereadinstructionsshouldbeavoided.However,in

situationswheresimultaneoususecannotbeavoided,theinterruptsshouldbedisabledpriortothe

executionofanymainroutinetable-readinstructions.Notethatalltablerelatedinstructionsrequire

twoinstructioncyclestocompletetheiroperation.

Table Read Program Example

tempreg1 db ?

; temporary register #1

tempreg2 db ?

; temporary register #2

mov a,06h

; initialise low table pointer - note that this address

; is referenced to the last page or present page

mov tblp,a

tabrdc tempreg1

; transfers value in table referenced by table pointer data at program

; memory address “706H” transferred to tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrdc tempreg2

; transfers value in table referenced by table pointer data at program

; memory address “705H” transferred to tempreg2 and TBLH in this

; example the data “1AH” is transferred to tempreg1 and data “0FH” to

; register tempreg2

org 700h

; sets initial address of program memory

dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

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