ATmega48PA/88PA/168PA/328P
Table 11-5 on page 63 shows reset and Interrupt Vectors placement for the various combina-
tions of BOOTRST and IVSEL settings. If the program never enables an interrupt source, the
Interrupt Vectors are not used, and regular program code can be placed at these locations. This
is also the case if the Reset Vector is in the Application section while the Interrupt Vectors are in
the Boot section or vice versa.
Table 11-5. Reset and Interrupt Vectors Placement in ATmega168PA(1)
BOOTRST
IVSEL
Reset Address
0x000
Interrupt Vectors Start Address
0x002
1
1
0
0
0
1
0
1
0x000
Boot Reset Address + 0x0002
0x002
Boot Reset Address
Boot Reset Address
Boot Reset Address + 0x0002
Note:
1. The Boot Reset Address is shown in Table 26-7 on page 289. For the BOOTRST Fuse “1”
means unprogrammed while “0” means programmed.
The most typical and general program setup for the Reset and Interrupt Vector Addresses in
ATmega168PA is:
Address Labels Code
Comments
0x0000
0x0002
0x0004
0x0006
0x0008
0x000A
0x000C
0x000E
0x0010
0x0012
0x0014
0x0016
0x0018
0x001A
0x001C
0x001E
0x0020
0x0022
0x0024
0x0026
0x0028
0x002A
0x002C
0x002E
0x0030
0x0032
;
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
RESET
; Reset Handler
EXT_INT0
EXT_INT1
PCINT0
; IRQ0 Handler
; IRQ1 Handler
; PCINT0 Handler
PCINT1
; PCINT1 Handler
PCINT2
; PCINT2 Handler
WDT
; Watchdog Timer Handler
; Timer2 Compare A Handler
; Timer2 Compare B Handler
; Timer2 Overflow Handler
; Timer1 Capture Handler
; Timer1 Compare A Handler
; Timer1 Compare B Handler
; Timer1 Overflow Handler
; Timer0 Compare A Handler
; Timer0 Compare B Handler
; Timer0 Overflow Handler
; SPI Transfer Complete Handler
; USART, RX Complete Handler
; USART, UDR Empty Handler
; USART, TX Complete Handler
; ADC Conversion Complete Handler
; EEPROM Ready Handler
; Analog Comparator Handler
; 2-wire Serial Interface Handler
; Store Program Memory Ready Handler
TIM2_COMPA
TIM2_COMPB
TIM2_OVF
TIM1_CAPT
TIM1_COMPA
TIM1_COMPB
TIM1_OVF
TIM0_COMPA
TIM0_COMPB
TIM0_OVF
SPI_STC
USART_RXC
USART_UDRE
USART_TXC
ADC
EE_RDY
ANA_COMP
TWI
SPM_RDY
0x0033RESET:
ldi
r16, high(RAMEND); Main program start
63
8161D–AVR–10/09