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2503Q–AVR–02/11

ATmega32(L)

Interrupts This section describes the specifics of the interrupt handling as performed in ATmega32. For a

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

page 13.

Interrupt Vectors

in ATmega32

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 244.

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 19 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.

Table 18. 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

2 $002 INT0 External Interrupt Request 0

3 $004 INT1 External Interrupt Request 1

4 $006 INT2 External Interrupt Request 2

5 $008 TIMER2 COMP Timer/Counter2 Compare Match

6 $00A TIMER2 OVF Timer/Counter2 Overflow

7 $00C TIMER1 CAPT Timer/Counter1 Capture Event

8 $00E TIMER1 COMPA Timer/Counter1 Compare Match A

9 $010 TIMER1 COMPB Timer/Counter1 Compare Match B

10 $012 TIMER1 OVF Timer/Counter1 Overflow

11 $014 TIMER0 COMP Timer/Counter0 Compare Match

12 $016 TIMER0 OVF Timer/Counter0 Overflow

13 $018 SPI, STC Serial Transfer Complete

14 $01A USART, RXC USART, Rx Complete

15 $01C USART, UDRE USART Data Register Empty

16 $01E USART, TXC USART, Tx Complete

17 $020 ADC ADC Conversion Complete

18 $022 EE_RDY EEPROM Ready

19 $024 ANA_COMP Analog Comparator

20 $026 TWI Two-wire Serial Interface

21 $028 SPM_RDY Store Program Memory Ready