ATmega88 datasheet(59/340 Pages) ATMEL

59 / 340 page

7530H–AVR–02/09

ATmega48/88/168 Automotive

Notes:

1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader address at

reset, see “Boot Loader Support – Read-While-Write Self-Programming, ATmega88 and

ATmega168” on page 263.

2. When the IVSEL bit in MCUCR is set, Interrupt Vectors will be moved to the start of the Boot

Flash Section. The address of each Interrupt Vector will then be the address in this table

added to the start address of the Boot Flash Section.

Table 9-5 shows reset and Interrupt Vectors placement for the various combinations 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 24-6 on page 276. 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

ATmega168 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

0x002E

ANALOG

COMP

Analog Comparator

0x0030

TWI

2-wire Serial Interface

0x0032

SPM READY

Store Program Memory Ready

Table 9-5.

Reset and Interrupt Vectors Placement in ATmega168

(1)

BOOTRST

IVSEL

Reset Address

Interrupt Vectors Start Address

0x000

0x001

0x000

Boot Reset Address + 0x0002

Boot Reset Address

0x001

Boot Reset Address

Boot Reset Address + 0x0002

Table 9-4.

Reset and Interrupt Vectors in ATmega168

Vector

No.

Program

Address(2)

Source

Interrupt Definition

ATmega88 Datasheet(PDF) 59 Page - ATMEL Corporation

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