HT83B60 datasheet(22/84 Pages) HOLTEK

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HT83B60

Voice Mask MCU

HT83B60

Voice Mask MCU

Indirect Addressing Program Example

ThefollowingexampleshowshowtoclearasectionoffourDataMemorylocationsalreadydefined

aslocationsadres1toadres4.

data .section 'data'

adres1 db ?

adres2 db ?

adres3 db ?

adres4 db ?

block db ?

code .section at 0 code

org 00h

start:

mov a,04h

; setup size of block

mov block,a

mova,offsetadres1;AccumulatorloadedwithfirstRAMaddress

movmp0,a ;setupmemorypointerwithfirstRAMaddress

loop:

clrIAR0 ;clearthedataataddressdefinedbyMP0

inc mp0

; increment memory pointer

sdz block

; check if last memory location has been cleared

jmp loop

continue:

Theimportantpointtonotehereisthatintheexampleshownabove,noreferenceismadetospecific

DataMemoryaddresses.

Memory Pointers − MP0

Foralldevices,twoMemoryPointers,knownasMP0isprovided.TheseMemoryPointersare

physicallyimplementedintheDataMemoryandcanbemanipulatedinthesamewayasnormal

registersprovidingaconvenientwaywithwhichtoaddressandtrackdata.Whenanyoperationto

therelevantIndirectAddressingRegistersiscarriedout,theactualaddressthatthemicrocontroller

isdirectedto,istheaddressspecifiedbytherelatedMemoryPointer.

Accumulator − ACC

TheAccumulatoriscentraltotheoperationofanymicrocontrollerandiscloselyrelatedwith

operationscarriedoutbytheALU.TheAccumulatoristheplacewhereallintermediateresults

fromtheALUarestored.WithouttheAccumulatoritwouldbenecessarytowritetheresultof

eachcalculationorlogicaloperationsuchasaddition,subtraction,shift,etc.,totheDataMemory

resultinginhigherprogrammingandtimingoverheads.Datatransferoperationsusuallyinvolve

thetemporarystoragefunctionoftheAccumulator;forexample,whentransferringdatabetween

oneuserdefinedregisterandanother,itisnecessarytodothisbypassingthedatathroughthe

Accumulatorasnodirecttransferbetweentworegistersispermitted.

HT83B60 Datasheet(PDF) 22 Page - Holtek Semiconductor Inc

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