ATmega48 datasheet(55/340 Pages) ATMEL

55 / 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 9-3 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.

0x004

PCINT1

Pin Change Interrupt Request 1

0x005

PCINT2

Pin Change Interrupt Request 2

0x006

WDT

Watchdog Time-out Interrupt

80x007

TIMER2

COMPA

Timer/Counter2 Compare Match A

90x008

TIMER2

COMPB

Timer/Counter2 Compare Match B

0x009

TIMER2 OVF

Timer/Counter2 Overflow

0x00A

TIMER1 CAPT

Timer/Counter1 Capture Event

0x00B

TIMER1

COMPA

Timer/Counter1 Compare Match A

0x00C

TIMER1

COMPB

Timer/Coutner1 Compare Match B

0x00D

TIMER1 OVF

Timer/Counter1 Overflow

0x00E

TIMER0

COMPA

Timer/Counter0 Compare Match A

0x00F

TIMER0

COMPB

Timer/Counter0 Compare Match B

0x010

TIMER0 OVF

Timer/Counter0 Overflow

0x011

SPI, STC

SPI Serial Transfer Complete

0x012

USART, RX

USART Rx Complete

0x013

USART, UDRE

USART, Data Register Empty

0x014

USART, TX

USART, Tx Complete

0x015

ADC

ADC Conversion Complete

0x016

EE READY

EEPROM Ready

0x017

ANALOG

COMP

Analog Comparator

0x018

TWI

2-wire Serial Interface

0x019

SPM READY

Store Program Memory Ready

Table 9-2.

Reset and Interrupt Vectors in ATmega88

Vector

No.

Program

Address(2)

Source

Interrupt Definition

ATmega48 Datasheet(PDF) 55 Page - ATMEL Corporation

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