ATMEGA32 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'ATMEGA32' PDF : 346 Pages View PDF
Interrupts
Interrupt Vectors in
ATmega32
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.
Table 18. Reset and Interrupt Vectors
Vector No.
1
Program
Address(2)
$000(1)
Source
RESET
Interrupt Definition
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
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 loca-
tions. 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.
44 ATmega32(L)
2503J–AVR–10/06
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