ATmega325P datasheet(55/364 Pages) ATMEL

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8023F–AVR–07/09

ATmega325P/3250P

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

0x0000

RESET: ldi

r16,high(RAMEND); Main program start

0x0001

out

SPH,r16

; Set Stack Pointer to top of RAM

0x0002

ldi

r16,low(RAMEND)

0x0003

out

SPL,r16

0x0004

sei

; Enable interrupts

0x0005

<instr> xxx

;

.org 0x3802/0x7802

0x3804/0x7804

jmp

EXT_INT0

; IRQ0 Handler

0x3806/0x7806

jmp

PCINT0

; PCINT0 Handler

...

;

0x1C2C

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 0x0002

0x0002

jmp

EXT_INT0

; IRQ0 Handler

0x0004

jmp

PCINT0

; PCINT0 Handler

...

;

0x002C

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

.org 0x3800/0x7800

0x3800/0x7801RESET:ldir16,high(RAMEND); Main program start

0x3801/0x7801

out

SPH,r16

; Set Stack Pointer to top of RAM

0x3802/0x7802

ldi

r16,low(RAMEND)

0x3803/0x7803

out

SPL,r16

0x3804/0x7804

sei

; Enable interrupts

0x3805/0x7805

<instr>

xxx

When the BOOTRST Fuse is programmed, the Boot section size set to 4K 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:

0x0032

RESET:

ldi

r16, high(RAMEND)

; Main program start

0x0033

out

SPH,r16

; Set Stack Pointer to top of RAM

0x0034

ldi

r16, low(RAMEND)

0x0035

out

SPL,r16

0x0036

sei

; Enable interrupts

0x0037

<inst

xxx

...

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