ATMEGA6450SLASHV datasheet(47/347 Pages) ATMEL

47 / 347 page

ATmega325/3250/645/6450

2570A–AVR–09/04

Interrupts

This section describes the specifics of the interrupt handling as performed in

ATmega325/3250/645/6450. For a general explanation of the AVR interrupt handling,

refer to “Reset and Interrupt Handling” on page 14.

Interrupt Vectors in ATmega325/3250/645/6450

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”

on page 242.

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.

3. PCINT2 and PCINT3 are only present in ATmega3250 and ATmega6450.

Table 22. Reset and Interrupt Vectors

Vector

No.

Program

Address(2)

Source

Interrupt Definition

0x0000(1)

RESET

External Pin, Power-on Reset, Brown-out Reset,

Watchdog Reset, and JTAG AVR Reset

0x0002

INT0

External Interrupt Request 0

0x0004

PCINT0

Pin Change Interrupt Request 0

0x0006

PCINT1

Pin Change Interrupt Request 1

0x0008

TIMER2 COMP

Timer/Counter2 Compare Match

0x000A

TIMER2 OVF

Timer/Counter2 Overflow

0x000C

TIMER1 CAPT

Timer/Counter1 Capture Event

0x000E

TIMER1 COMPA

Timer/Counter1 Compare Match A

0x0010

TIMER1 COMPB

Timer/Counter1 Compare Match B

0x0012

TIMER1 OVF

Timer/Counter1 Overflow

0x0014

TIMER0 COMP

Timer/Counter0 Compare Match

0x0016

TIMER0 OVF

Timer/Counter0 Overflow

0x0018

SPI, STC

SPI Serial Transfer Complete

0x001A

USART, RX

USART, Rx Complete

0x001C

USART, UDRE

USART Data Register Empty

0x001E

USART, TX

USART, Tx Complete

0x0020

USI START

USI Start Condition

0x0022

USI OVERFLOW

USI Overflow

0x0024

ANALOG COMP

Analog Comparator

0x0026

ADC

ADC Conversion Complete

0x0028

EE READY

EEPROM Ready

0x002A

SPM READY

Store Program Memory Ready

0x002C

NOT_USED

RESERVED

24(3)

0x002E

PCINT2

Pin Change Interrupt Request 2

25(3)

0x0030

PCINT3

Pin Change Interrupt Request 3

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