ATmega128 datasheet(63/386 Pages) ATMEL

63 / 386 page

2467S–AVR–07/09

ATmega128

When the BOOTRST fuse is unprogrammed, the Boot section size set to 8K bytes and the

IVSEL bit in the MCUCR Register is set before any interrupts are enabled, the most typical and

general program setup for the Reset and Interrupt Vector Addresses is:

Address

LabelsCode

Comments

$0000

RESET:ldi

r16,high(RAMEND); Main program start

$0001

out

SPH,r16

; Set stack pointer to top of RAM

$0002

ldi

r16,low(RAMEND)

$0003

out

SPL,r16

$0004

sei

; Enable interrupts

$0005

<instr>

xxx

;

.org $F002

$F002

jmp

EXT_INT0

; IRQ0 Handler

$F004

jmp

EXT_INT1

; IRQ1 Handler

...

;

$F044

jmp

SPM_RDY

; Store Program Memory Ready Handler

When the BOOTRST fuse is programmed and the Boot section size set to 8K bytes, the most

typical and general program setup for the Reset and Interrupt Vector Addresses is:

Address

LabelsCode

Comments

.org $0002

$0002

jmp

EXT_INT0

; IRQ0 Handler

$0004

jmp

EXT_INT1

; IRQ1 Handler

...

;

$0044

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

.org $F000

$F000

RESET: ldi

r16,high(RAMEND); Main program start

$F001

out

SPH,r16

; Set stack pointer to top of RAM

$F002

ldi

r16,low(RAMEND)

$F003

out

SPL,r16

$F004

sei

; Enable interrupts

$F005

<instr>

xxx

When the BOOTRST fuse is programmed, the Boot section size set to 8K bytes and the IVSEL

bit in the MCUCR Register is set before any interrupts are enabled, the most typical and general

program setup for the Reset and Interrupt Vector Addresses is:

Address

Labels

Code

Comments

;

.org $F000

$F000

jmp

RESET

; Reset handler

$F002

jmp

EXT_INT0

; IRQ0 Handler

$F004

jmp

EXT_INT1

; IRQ1 Handler

...

;

$F044

jmp

SPM_RDY

; Store Program Memory Ready Handler

$F046

RESET: ldi

r16,high(RAMEND); Main program start

$F047

out

SPH,r16

; Set stack pointer to top of RAM

$F048

ldi

r16,low(RAMEND)

ATmega128 Datenblatt(PDF) 63 Page - ATMEL Corporation

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