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ATMEGA16-16MC Datasheet(PDF) 42 Page - ATMEL Corporation

Part No. ATMEGA16-16MC
Description  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
Download  315 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATMEGA16-16MC Datasheet(HTML) 42 Page - ATMEL Corporation

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42
ATmega16(L)
2466E–AVR–10/02
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 241.
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
Two-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


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