ATMEGA48 datasheet(56/374 Pages) ATMEL

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2545J–AVR–12/06

ATmega48/88/168

10. Interrupts

10.1

Overview

This section describes the specifics of the interrupt handling as performed in ATmega48/88/168.

For a general explanation of the AVR interrupt handling, refer to ”Reset and Interrupt Handling”

on page 15.

The interrupt vectors in ATmega48, ATmega88 and ATmega168 are generally the same, with

the following differences:

• Each Interrupt Vector occupies two instruction words in ATmega168, and one instruction word

in ATmega48 and ATmega88.

• ATmega48 does not have a separate Boot Loader Section. In ATmega88 and ATmega168, the

Reset Vector is affected by the BOOTRST fuse, and the Interrupt Vector start address is

affected by the IVSEL bit in MCUCR.

10.2

Interrupt Vectors in ATmega48

Table 10-1.

Reset and Interrupt Vectors in ATmega48

Vector No.

Program Address

Source

Interrupt Definition

0x000

RESET

External Pin, Power-on Reset, Brown-out Reset and Watchdog System Reset

0x001

INT0

External Interrupt Request 0

0x002

INT1

External Interrupt Request 1

0x003

PCINT0

Pin Change Interrupt Request 0

0x004

PCINT1

Pin Change Interrupt Request 1

0x005

PCINT2

Pin Change Interrupt Request 2

0x006

WDT

Watchdog Time-out Interrupt

0x007

TIMER2 COMPA

Timer/Counter2 Compare Match A

0x008

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

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