ATmega32A datasheet(45/352 Pages) ATMEL

45 / 352 page

8155B–AVR–07/09

ATmega32A

11. Interrupts

This section describes the specifics of the interrupt handling as performed in ATmega32A. For a

general explanation of the AVR interrupt handling, refer to “Reset and Interrupt Handling” on

page 13.

11.1

Interrupt Vectors in ATmega32A

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 252.

2. When the IVSEL bit in GICR 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 11-2 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

Table 11-1.

Reset and Interrupt Vectors

Vector No.

Program

Address(2)

Source

Interrupt Definition

1$000(1)

RESET

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

Watchdog Reset, and JTAG AVR Reset

$002

INT0

External Interrupt Request 0

$004

INT1

External Interrupt Request 1

$006

INT2

External Interrupt Request 2

$008

TIMER2 COMP

Timer/Counter2 Compare Match

$00A

TIMER2 OVF

Timer/Counter2 Overflow

$00C

TIMER1 CAPT

Timer/Counter1 Capture Event

$00E

TIMER1 COMPA

Timer/Counter1 Compare Match A

$010

TIMER1 COMPB

Timer/Counter1 Compare Match B

$012

TIMER1 OVF

Timer/Counter1 Overflow

$014

TIMER0 COMP

Timer/Counter0 Compare Match

$016

TIMER0 OVF

Timer/Counter0 Overflow

$018

SPI, STC

Serial Transfer Complete

$01A

USART, RXC

USART, Rx Complete

$01C

USART, UDRE

USART Data Register Empty

$01E

USART, TXC

USART, Tx Complete

$020

ADC

ADC Conversion Complete

$022

EE_RDY

EEPROM Ready

$024

ANA_COMP

Analog Comparator

$026

TWI

Two-wire Serial Interface

$028

SPM_RDY

Store Program Memory Ready

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