HT67F488 datasheet(30/171 Pages) HOLTEK

30 / 171 page

Rev. 1.60

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Direct Addressing Program Example using extended instructions

data .section ´data´

temp db ?

code .section at 0 ´code´

org 00h

start:

lmov a, [m]

; move [m] data to acc

lsub a, [m+1]

; compare [m] and [m+1] data

snz c

; [m]>[m+1]?

jmp continue

; no

lmov a, [m]

; yes, exchange [m] and [m+1] data

mov temp, a

lmov a, [m+1]

lmov [m], a

mov a, temp

lmov [m+1], a

continue:

Note:Here“m”isadatamemoryaddresslocatedinanydatamemorysectors.Forexample,

m=1F0H,itindicatesaddress0F0HinSector1.

Accumulator – ACC

TheAccumulatoriscentraltotheoperationofanymicrocontrollerandiscloselyrelatedwith

operationscarriedoutbytheALU.TheAccumulatoristheplacewhereallintermediateresults

fromtheALUarestored.WithouttheAccumulatoritwouldbenecessarytowritetheresultof

eachcalculationorlogicaloperationsuchasaddition,subtraction,shift,etc.,totheDataMemory

resultinginhigherprogrammingandtimingoverheads.Datatransferoperationsusuallyinvolve

thetemporarystoragefunctionoftheAccumulator;forexample,whentransferringdatabetween

oneuserdefinedregisterandanother,itisnecessarytodothisbypassingthedatathroughthe

Accumulatorasnodirecttransferbetweentworegistersispermitted.

Program Counter Low Register – PCL

Toprovideadditionalprogramcontrolfunctions,thelowbyteoftheProgramCounterismade

accessibletoprogrammersbylocatingitwithintheSpecialPurposeareaoftheDataMemory.By

manipulatingthisregister,directjumpstootherprogramlocationsareeasilyimplemented.Loading

avaluedirectlyintothisPCLregisterwillcauseajumptothespecifiedProgramMemorylocation,

however,astheregisterisonly8-bitwide,onlyjumpswithinthecurrentProgramMemorypageare

permitted.Whensuchoperationsareused,notethatadummycyclewillbeinserted.

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