Rainbow Electronics ATmega8515L - Manual (Page 51)

51
ATmega8515(L)
2512A–AVR–04/02
Interrupts
This section describes the specifics of the interrupt handling as performed in
ATmega8515. For a general explanation of the AVR interrupt handling, refer to “Reset
and Interrupt Handling” on page 11.
Interrupt Vectors in
ATmega8515
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 162.
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 23 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 22. Reset and Interrupt Vectors
Vector No.
Program
Address (2) Source Interrupt Definition
1 $000 (1) RESET External Pin, Power-on Reset, Brown-out
Reset and Watchdog Reset
2 $001 INT0 External Interrupt Request 0
3 $002 INT1 External Interrupt Request 1
4 $003 TIMER1 CAPT Timer/Counter1 Capture Event
5 $004 TIMER1 COMPA Timer/Counter1 Compare Match A
6 $005 TIMER1 COMPB Timer/Counter1 Compare Match B
7 $006 TIMER1 OVF Timer/Counter1 Overflow
8 $007 TIMER0 OVF Timer/Counter0 Overflow
9 $008 SPI, STC Serial Transfer Complete
10 $009 USART, RXC USART, Rx Complete
11 $00A USART, UDRE USART Data Register Empty
12 $00B USART, TXC USART, Tx Complete
13 $00C ANA_COMP Analog Comparator
14 $00D INT2 External Interrupt Request 2
15 $00E TIMER0 COMP Timer/Counter0 Compare Match
16 $00F EE_RDY EEPROM Ready
17 $010 SPM_RDY Store Program Memory Ready