HT45F65 datasheet(40/231 Pages) HOLTEK

40 / 231 page

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

Special Function Register Description

MostoftheSpecialFunctionRegisterdetailswillbedescribedintherelevantfunctionalsection;

howeverseveralregistersrequireaseparatedescriptioninthissection.

Indirect Addressing Registers – IAR0, IAR1

TheIndirectAddressingRegisters,IAR0andIAR1,althoughhavingtheirlocationsinnormalRAM

registerspace,donotactuallyphysicallyexistasnormalregisters.Themethodofindirectaddressing

forRAMdatamanipulationusestheseIndirectAddressingRegistersandMemoryPointers,in

contrasttodirectmemoryaddressing,wheretheactualmemoryaddressisspecified.Actionsonthe

IAR0andIAR1registerswillresultinnoactualreadorwriteoperationtotheseregistersbutrather

tothememorylocationspecifiedbytheircorrespondingMemoryPointers,MP0orMP1.Actingasa

pair,IAR0andMP0cantogetheraccessdatafromBank0whiletheIAR1andMP1registerpaircan

accessdatafromanybank.AstheIndirectAddressingRegistersarenotphysicallyimplemented,

readingtheIndirectAddressingRegistersindirectlywillreturnaresultof"00H"andwritingtothe

registersindirectlywillresultinnooperation.

Memory Pointers – MP0, MP1

TwoMemoryPointers,knownasMP0andMP1areprovided.TheseMemoryPointersare

physicallyimplementedintheDataMemoryandcanbemanipulatedinthesamewayasnormal

registersprovidingaconvenientwaywithwhichtoaddressandtrackdata.Whenanyoperationto

therelevantIndirectAddressingRegistersiscarriedout,theactualaddressthatthemicrocontroller

isdirectedtoistheaddressspecifiedbytherelatedMemoryPointer.MP0,togetherwithIndirect

AddressingRegister,IAR0,areusedtoaccessdatafromBank0,whileMP1andIAR1areusedto

accessdatafromallbanksaccordingtoBPregister.DirectAddressingcanonlybeusedwithBank0,

allotherBanksmustbeaddressedindirectlyusingMP1andIAR1.

Indirect Addressing Program Example

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, offset adres1 ; Accumulator loaded with first RAM address

mov mp0, a

; setup memory pointer with first RAM address

loop:

clr IAR0

; clear the data at address defined by MP0

inc mp0

; increment memory pointer

sdz block

; check if last memory location has been cleared

jmp loop

continue:

Theimportantpointtonotehereisthatintheexampleshownabove,noreferenceismadetospecific

DataMemoryaddresses.

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