Datasheet
46
ATmega8535(L)
2502K–AVR–10/06
Interrupts This section describes the specifics of the interrupt handling as performed in
ATmega8535. For a general explanation of the AVR interrupt handling, refer to “Reset
and Interrupt Handling” on page 13.
Interrupt Vectors in
ATmega8535
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 224.
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 20 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.
Table 19. Reset and Interrupt Vectors
Vector
No.
Program
Address
(2)
Source Interrupt Definition
1 0x000
(1)
RESET 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 INT2 External Interrupt Request 2
20 0x013 TIMER0 COMP Timer/Counter0 Compare Match
21 0x014 SPM_RDY Store Program Memory Ready