HT66F20 datasheet(40/298 Pages) HOLTEK

40 / 298 page

Rev. 1.90

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Rev. 1.90

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

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

Dependinguponwhichdeviceisused,theProgramandDataMemoryaredividedintoseveral

banks.SelectingtherequiredProgramandDataMemoryareaisachievedusingtheBankPointer.

Bit5oftheBankPointerisusedtoselectProgramMemoryBank0or1,whilebits0~2areusedto

selectDataMemoryBanks0~4.

TheDataMemoryisinitialisedtoBank0afterareset,exceptforaWDTtime-outresetinthePower

DownMode,inwhichcase,theDataMemorybankremainsunaffected.Itshouldbenotedthatthe

SpecialFunctionDataMemoryisnotaffectedbythebankselection,whichmeansthattheSpecial

FunctionRegisterscanbeaccessedfromwithinanybank.DirectlyaddressingtheDataMemory

willalwaysresultinBank0beingaccessedirrespectiveofthevalueoftheBankPointer.Accessing

datafrombanksotherthanBank0mustbeimplementedusingIndirectaddressing.

AsboththeProgramMemoryandDataMemorysharethesameBankPointerRegister,caremustbe

takenduringprogramming.

Device

Bit

HT66��0

HT66�40

—

DMBP0

HT66��0

HT66�50

—

DMBP1 DMBP0

HT66�60

—

PMBP0

—

DMBP� DMBP1 DMBP0

BP Register List

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