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ATmega16(L)

2466B–09/01

Interrupts This section describes the specifics of the interrupt handling as performed in

ATmega16. For a general explanation of the AVR interrupt handling, refer to “Reset and

Interrupt Handling” on page 11.

Interrupt Vectors in

ATmega16

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 240.

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.

Table 18. Reset and Interrupt Vectors

Vector No.

Program

Address

(2)

Source Interrupt Definition

1$000

(1)

RESET 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 TIMER2 COMP Timer/Counter2 Compare Match

5 $008 TIMER2 OVF Timer/Counter2 Overflow

6 $00A TIMER1 CAPT Timer/Counter1 Capture Event

7 $00C TIMER1 COMPA Timer/Counter1 Compare Match A

8 $00E TIMER1 COMPB Timer/Counter1 Compare Match B

9 $010 TIMER1 OVF Timer/Counter1 Overflow

10 $012 TIMER0 OVF Timer/Counter0 Overflow

11 $014 SPI, STC Serial Transfer Complete

12 $016 USART, RXC USART, Rx Complete

13 $018 USART, UDRE USART Data Register Empty

14 $01A USART, TXC USART, Tx Complete

15 $01C ADC ADC Conversion Complete

16 $01E EE_RDY EEPROM Ready

17 $020 ANA_COMP Analog Comparator

18 $022 TWI 2-wire Serial Interface

19 $024 INT2 External Interrupt Request 2

20 $026 TIMER0 COMP Timer/Counter0 Compare Match

21 $028 SPM_RDY Store Program Memory Ready

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 297 298

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