ATMEGA8_08 Datasheet, PDF(46/308 Page) ATMEL Corporation – 8-bit with 8K Bytes In-System Programmable Flash

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ATMEGA8_08 Datasheet, PDF (46/308 Pages) ATMEL Corporation – 8-bit with 8K Bytes In-System Programmable Flash

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Interrupts

Interrupt Vectors

in ATmega8

This section describes the specifics of the interrupt handling performed by the ATmega8. For a

general explanation of the AVR interrupt handling, refer to âReset and Interrupt Handlingâ on

page 14.

Table 18. Reset and Interrupt Vectors

Vector No.

1

Program

Address(2)

0x000(1)

Source

RESET

Interrupt Definition

External Pin, Power-on Reset, Brown-out

Reset, and Watchdog Reset

2

0x001 INT0

External Interrupt Request 0

3

0x002 INT1

External Interrupt Request 1

4

0x003 TIMER2 COMP Timer/Counter2 Compare Match

5

0x004 TIMER2 OVF

Timer/Counter2 Overflow

6

0x005 TIMER1 CAPT Timer/Counter1 Capture Event

7

0x006 TIMER1 COMPA Timer/Counter1 Compare Match A

8

0x007 TIMER1 COMPB Timer/Counter1 Compare Match B

9

0x008 TIMER1 OVF

Timer/Counter1 Overflow

10

0x009 TIMER0 OVF

Timer/Counter0 Overflow

11

0x00A SPI, STC

Serial Transfer Complete

12

0x00B USART, RXC

USART, Rx Complete

13

0x00C USART, UDRE USART Data Register Empty

14

0x00D USART, TXC

USART, Tx Complete

15

0x00E ADC

ADC Conversion Complete

16

0x00F EE_RDY

EEPROM Ready

17

0x010 ANA_COMP

Analog Comparator

18

0x011 TWI

Two-wire Serial Interface

19

0x012 SPM_RDY

Store Program Memory Ready

Notes:

1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader address at

reset, see âBoot Loader Support â Read-While-Write Self-Programmingâ on page 209.

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.

46 ATmega8(L)

2486TâAVRâ05/08

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