HT66F0187 datasheet(32/192 Pages) HOLTEK

32 / 192 page

Rev. 1.20

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Rev. 1.20

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HT66F0187

A/D Flash MCU with EEPROM

HT66F0187

A/D Flash MCU with 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.

Look-up Table Registers – TBLP, TBHP, TBLH

Thesethreespecialfunctionregistersareusedtocontroloperationofthelook-uptablewhichis

storedintheProgramMemory.TBLPandTBHParethetablepointersandindicatethelocation

wherethetabledataislocated.Theirvaluemustbesetupbeforeanytablereadcommandsare

executed.Theirvaluecanbechanged,forexampleusingthe“INC”or“DEC”instructions,allowing

foreasytabledatapointingandreading.TBLHisthelocationwherethehighorderbyteofthetable

dataisstoredafteratablereaddatainstructionhasbeenexecuted.Notethatthelowerordertable

databyteistransferredtoauserdefinedlocation.

HT66F0187 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

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