ATMEGA640 datasheet(102/436 Pages) MICROCHIP

102 / 436 page

102

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

Notes: 1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader address at reset, see “Memory

Programming” on page 325.

2. When the IVSEL bit in MCUCR 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.

3. Only available in

ATmega640/1280/2560.

14.2 Reset and Interrupt Vector placement

Table 14-2 on page 103 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 reg-

ular program code can be placed at these locations. 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.

$003C

EE READY

EEPROM Ready

$003E

TIMER3 CAPT

Timer/Counter3 Capture Event

$0040

TIMER3 COMPA

Timer/Counter3 Compare Match A

$0042

TIMER3 COMPB

Timer/Counter3 Compare Match B

$0044

TIMER3 COMPC

Timer/Counter3 Compare Match C

$0046

TIMER3 OVF

Timer/Counter3 Overflow

$0048

USART1 RX

USART1 Rx Complete

$004A

USART1 UDRE

USART1 Data Register Empty

$004C

USART1 TX

USART1 Tx Complete

$004E

TWI

2-wire Serial Interface

$0050

SPM READY

Store Program Memory Ready

$0052(3)

TIMER4 CAPT

Timer/Counter4 Capture Event

$0054

TIMER4 COMPA

Timer/Counter4 Compare Match A

$0056

TIMER4 COMPB

Timer/Counter4 Compare Match B

$0058

TIMER4 COMPC

Timer/Counter4 Compare Match C

$005A

TIMER4 OVF

Timer/Counter4 Overflow

$005C(3)

TIMER5 CAPT

Timer/Counter5 Capture Event

$005E

TIMER5 COMPA

Timer/Counter5 Compare Match A

$0060

TIMER5 COMPB

Timer/Counter5 Compare Match B

$0062

TIMER5 COMPC

Timer/Counter5 Compare Match C

$0064

TIMER5 OVF

Timer/Counter5 Overflow

$0066(3)

USART2 RX

USART2 Rx Complete

$0068(3)

USART2 UDRE

USART2 Data Register Empty

$006A(3)

USART2 TX

USART2 Tx Complete

$006C(3)

USART3 RX

USART3 Rx Complete

$006E(3)

USART3 UDRE

USART3 Data Register Empty

$0070(3)

USART3 TX

USART3 Tx Complete

Table 14-1.

Reset and Interrupt Vectors (Continued)

Vector No.

Program Address(2)

Source

Interrupt Definition

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