HT45F75 datasheet(35/190 Pages) HOLTEK

35 / 190 page

Rev. 1.10

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Indirect Addressing Program Example 2

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

mov a, 01h

; setup the memory sector

mov mp1h, a

mova,offsetadres1;AccumulatorloadedwithfirstRAMaddress

movmp1l,a ;setupmemorypointerwithfirstRAMaddress

loop:

clrIAR1;clearthedataataddressdefinedbyMP1L

incmp1l;incrementmemorypointerMP1L

sdz block

; check if last memory location has been cleared

jmp loop

continue:

Theimportantpointtonotehereisthatintheexampleshownabove,noreferenceismadetospecific

DataMemoryaddresses.

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

oneuser-definedregisterandanother,itisnecessarytodothisbypassingthedatathroughthe

Accumulatorasnodirecttransferbetweentworegistersispermitted.

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