ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 46

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

46
ATmega8(L)
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:
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
$000
;
$001
$002
$003
$004
$005
$006
;
.org $c01
$c01
$c02
...
$c12
Handler
AddressLabels Code
.org $001
$001
$002
...
$012
Handler
;
.org $c00
$c00
;
$c01
$c02
$c03
$c04
$c05
$c06
RESET:ldi
RESET:ldi
rjmp
out
ldi
out
sei
<instr>
rjmp
rjmp
...
rjmp
rjmp
rjmp
...
rjmp
rjmp
out
ldi
out
sei
<instr>
RESET
r16,high(RAMEND); Main program start
SPH,r16
r16,low(RAMEND)
SPL,r16
EXT_INT0
EXT_INT1
... ;
SPM_RDY
EXT_INT0
EXT_INT1
...
SPM_RDY
RESET
r16,high(RAMEND); Main program start
SPH,r16
r16,low(RAMEND)
SPL,r16
xxx
xxx
; Enable interrupts
; IRQ0 Handler
; IRQ1 Handler
; Store Program Memory Ready
Comments
; IRQ0 Handler
; IRQ1 Handler
;
; Store Program Memory Ready
; Reset handler
; Set Stack Pointer to top of RAM
; Enable interrupts
Comments
; Reset handler
; Set Stack Pointer to top of RAM
2486M–AVR–12/03