ATmega328P datasheet(63/448 Pages) ATMEL

63 / 448 page

8161D–AVR–10/09

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.

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

jmp

RESET

; Reset Handler

0x0002

jmp

EXT_INT0

; IRQ0 Handler

0x0004

jmp

EXT_INT1

; IRQ1 Handler

0x0006

jmp

PCINT0

; PCINT0 Handler

0x0008

jmp

PCINT1

; PCINT1 Handler

0x000A

jmp

PCINT2

; PCINT2 Handler

0x000C

jmp

WDT

; Watchdog Timer Handler

0x000E

jmp

TIM2_COMPA

; Timer2 Compare A Handler

0x0010

jmp

TIM2_COMPB

; Timer2 Compare B Handler

0x0012

jmp

TIM2_OVF

; Timer2 Overflow Handler

0x0014

jmp

TIM1_CAPT

; Timer1 Capture Handler

0x0016

jmp

TIM1_COMPA

; Timer1 Compare A Handler

0x0018

jmp

TIM1_COMPB

; Timer1 Compare B Handler

0x001A

jmp

TIM1_OVF

; Timer1 Overflow Handler

0x001C

jmp

TIM0_COMPA

; Timer0 Compare A Handler

0x001E

jmp

TIM0_COMPB

; Timer0 Compare B Handler

0x0020

jmp

TIM0_OVF

; Timer0 Overflow Handler

0x0022

jmp

SPI_STC

; SPI Transfer Complete Handler

0x0024

jmp

USART_RXC

; USART, RX Complete Handler

0x0026

jmp

USART_UDRE

; USART, UDR Empty Handler

0x0028

jmp

USART_TXC

; USART, TX Complete Handler

0x002A

jmp

ADC

; ADC Conversion Complete Handler

0x002C

jmp

EE_RDY

; EEPROM Ready Handler

0x002E

jmp

ANA_COMP

; Analog Comparator Handler

0x0030

jmp

TWI

; 2-wire Serial Interface Handler

0x0032

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

0x0033RESET:

ldi

r16, high(RAMEND); Main program start

Table 11-5.

Reset and Interrupt Vectors Placement in ATmega168PA(1)

BOOTRST

IVSEL

Reset Address

Interrupt Vectors Start Address

0x000

0x002

0x000

Boot Reset Address + 0x0002

Boot Reset Address

0x002

Boot Reset Address

Boot Reset Address + 0x0002

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