ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 44

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Interrupts
Interrupt Vectors in
ATmega8
44
ATmega8(L)
This section describes the specifics of the interrupt handling performed by the
ATmega8. For a general explanation of the AVR interrupt handling, refer to “Reset and
Interrupt Handling” on page 12.
Table 18. Reset and Interrupt Vectors
Notes:
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.
Vector No.
10
11
12
13
14
15
16
17
18
19
1
2
3
4
5
6
7
8
9
1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader
2. When the IVSEL bit in GICR is set, Interrupt Vectors will be moved to the start of the
address at reset, see “Boot Loader Support – Read-While-Write Self-Programming”
on page 206.
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.
Address
Program
0x000
0x00A
0x00B
0x00C
0x00D
0x00E
0x001
0x002
0x003
0x004
0x005
0x006
0x007
0x008
0x009
0x00F
0x010
0x011
0x012
(1)
(2)
Source
RESET
INT0
INT1
TIMER2 COMP
TIMER2 OVF
TIMER1 CAPT
TIMER1 COMPA
TIMER1 COMPB
TIMER1 OVF
TIMER0 OVF
SPI, STC
USART, RXC
USART, UDRE
USART, TXC
ADC
EE_RDY
ANA_COMP
TWI
SPM_RDY
Interrupt Definition
External Pin, Power-on Reset, Brown-out
Reset, and Watchdog Reset
External Interrupt Request 0
External Interrupt Request 1
Timer/Counter2 Compare Match
Timer/Counter2 Overflow
Timer/Counter1 Capture Event
Timer/Counter1 Compare Match A
Timer/Counter1 Compare Match B
Timer/Counter1 Overflow
Timer/Counter0 Overflow
Serial Transfer Complete
USART, Rx Complete
USART Data Register Empty
USART, Tx Complete
ADC Conversion Complete
EEPROM Ready
Analog Comparator
Two-wire Serial Interface
Store Program Memory Ready
2486M–AVR–12/03