ATMEGA8 datasheet(46/303 Pages) ATMEL

46 / 303 page

ATmega8(L)

2486M–AVR–12/03

When the BOOTRST Fuse is unprogrammed, the boot section size set to 2K 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:

AddressLabels Code

Comments

$000

rjmp

RESET

; Reset handler

;

$001

RESET:ldi

r16,high(RAMEND); Main program start

$002

out

SPH,r16

; Set Stack Pointer to top of RAM

$003

ldi

r16,low(RAMEND)

$004

out

SPL,r16

$005

sei

; Enable interrupts

$006

<instr>

xxx

;

.org $c01

$c01

rjmp

EXT_INT0

; IRQ0 Handler

$c02

rjmp

EXT_INT1

; IRQ1 Handler

...

... ;

$c12

rjmp

SPM_RDY

; Store Program Memory Ready

Handler

When the BOOTRST Fuse is programmed and the boot section size set to 2K bytes, the

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

AddressLabels Code

Comments

.org $001

$001

rjmp

EXT_INT0

; IRQ0 Handler

$002

rjmp

EXT_INT1

; IRQ1 Handler

...

;

$012

rjmp

SPM_RDY

; Store Program Memory Ready

Handler

;

.org $c00

$c00

rjmp

RESET

; Reset handler

;

$c01

RESET:ldi

r16,high(RAMEND); Main program start

$c02

out

SPH,r16

; Set Stack Pointer to top of RAM

$c03

ldi

r16,low(RAMEND)

$c04

out

SPL,r16

$c05

sei

; Enable interrupts

$c06

<instr>

xxx

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