HT69F360 datasheet(52/235 Pages) HOLTEK

52 / 235 page

Rev. 1.30

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

Special Function Register Description

MostoftheSpecialFunctionRegisterdetailswillbedescribedintherelevantfunctionalsections,

howeverseveralregistersrequireaseparatedescriptioninthissection.

Indirect Addressing Register – IAR0, IAR1, IAR2

TheIndirectAddressingRegisters,IAR0,IAR1andIAR2,althoughhavingtheirlocationsinnormal

RAMregisterspace,donotactuallyphysicallyexistasnormalregisters.Themethodofindirect

addressingforRAMdatamanipulationusestheseIndirectAddressingRegistersandMemory

Pointers,incontrasttodirectmemoryaddressing,wheretheactualmemoryaddressisspecified.

ActionsontheIAR0,IAR1andIAR2registerswillresultinnoactualreadorwriteoperationto

theseregistersbutrathertothememorylocationspecifiedbytheircorrespondingMemoryPointers,

MP0,MP1L/MP1HorMP2L/MP2H.Actingasapair,IAR0andMP0cantogetheraccessdata

onlyfromSector0whiletheIAR1registertogetherwithMP1L/MP1HregisterpairandIAR2

registertogetherwithMP2L/MP2HregisterpaircanaccessdatafromanyDataMemorysector.As

theIndirectAddressingRegistersarenotphysicallyimplemented,readingtheIndirectAddressing

Registersindirectlywillreturnaresultof“00H”andwritingtotheregistersindirectlywillresultin

nooperation.

Memory Pointers – MP0, MP1L, MP1H, MP2L, MP2H

FiveMemoryPointers,knownasMP0,MP1L,MP1H,MP2LandMP2H,areprovided.These

MemoryPointersarephysicallyimplementedintheDataMemoryandcanbemanipulatedinthe

samewayasnormalregistersprovidingaconvenientwaywithwhichtoaddressandtrackdata.

WhenanyoperationtotherelevantIndirectAddressingRegistersiscarriedout,theactualaddress

thatthemicrocontrollerisdirectedtoistheaddressspecifiedbytherelatedMemoryPointer.MP0,

togetherwithIndirectAddressingRegister,IAR0,areusedtoaccessdatafromSector0,while

MP1L/MP1HtogetherwithIAR1andMP2L/MP2HtogetherwithIAR2areusedtoaccessdata

fromalldatasectorsaccordingtothecorrespondingMP1HorMP2Hregister.DirectAddressingcan

beusedinalldatasectorsusingthecorrespondinginstructionwhichcanaddressallavailabledata

memoryspace.

ThefollowingexampleshowshowtoclearasectoroffourDataMemorylocationsalreadydefined

aslocationsadres1toadres4.

Indirect Addressing Program Example 1

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:

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