ATmega32A datasheet(47/352 Pages) ATMEL

47 / 352 page

8155B–AVR–07/09

ATmega32A

When the BOOTRST Fuse is unprogrammed, the Boot section size set to 4K bytes and the

IVSEL bit in the GICR 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

$000

RESET:

ldi

r16,high(RAMEND); Main program start

$001

out

SPH,r16

; Set Stack Pointer to top of RAM

$002

ldi

r16,low(RAMEND)

$003

out

SPL,r16

$004

sei

; Enable interrupts

$005

<instr>

xxx

;

.org $3802

$3802

jmp

EXT_INT0

; IRQ0 Handler

$3804

jmp

EXT_INT1

; IRQ1 Handler

:..

;

$3828

jmp

SPM_RDY

; Store Program Memory Ready Handler

When the BOOTRST Fuse is programmed and the Boot section size set to 4K bytes, the most

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

Address

Labels

Code

Comments

.org $002

$002

jmp

EXT_INT0

; IRQ0 Handler

$004

jmp

EXT_INT1

; IRQ1 Handler

:..

;

$028

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

.org $3800

$3800

RESET:

ldi

r16,high(RAMEND); Main program start

$3801

out

SPH,r16

; Set Stack Pointer to top of RAM

$3802

ldi

r16,low(RAMEND)

$3803

out

SPL,r16

$3804

sei

; Enable interrupts

$3805

<instr>

xxx

When the BOOTRST Fuse is programmed, the Boot section size set to 4K bytes and the IVSEL

bit in the GICR 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 $3800

$3800

jmp

RESET

; Reset handler

$3802

jmp

EXT_INT0

; IRQ0 Handler

$3804

jmp

EXT_INT1

; IRQ1 Handler

:..

;

$3828

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

$382A

RESET:

ldi

r16,high(RAMEND); Main program start

$382B

out

SPH,r16

; Set Stack Pointer to top of RAM

$382C

ldi

r16,low(RAMEND)

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