HT68F006 datasheet(22/93 Pages) HOLTEK

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HT68F005/HT68F006

Enhanced I/O Flash Type MCU

HT68F005/HT68F006

Enhanced I/O Flash Type MCU

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

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

RAMaddresses.

Bank Pointer – BP

Forthisseriesofdevices,theDataMemoryisdividedintotwobanks.SelectingtherequiredData

MemoryareaisachievedusingtheBankPointer.Bit0isusedtoselectDataMemoryBanks0~1.

TheDataMemoryisinitialisedtoBank0afterareset,exceptforaWDTtime-outresetinthePower

DownMode,inwhichcase,theDataMemorybankremainsunaffected.Itshouldbenotedthatthe

SpecialFunctionDataMemoryisnotaffectedbythebankselection,whichmeansthattheSpecial

FunctionRegisterscanbeaccessedfromwithinanybank.DirectlyaddressingtheDataMemory

willalwaysresultinBank0beingaccessedirrespectiveofthevalueoftheBankPointer.Accessing

datafrombanksotherthanBank0mustbeimplementedusingindirectaddressing.

BP Register

Bit

Name

—

DMBP0

R/W

—

R/W

P�R

—

Bit7~1

Unimplemented,readas“0”

Bit0

DMBP0:SelectDataMemoryBanks

0:Bank0

1:Bank1

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