ATmega16U4 datasheet(61/408 Pages) ATMEL

61 / 408 page

7766D–AVR–01/09

ATmega16U4/ATmega32U4

Notes:

1. When the BOOTRST Fuse is programmed, the device will jump to the Boot Loader address at

reset, see “Memory Programming” on page 348.

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.

Table 9-2 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 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.

$003A

ADC

ADC Conversion Complete

$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

TWI

2-wire Serial Interface

$004A

SPM READY

Store Program Memory Ready

$004C

TIMER4 COMPA

Timer/Counter4 Compare Match A

$004E

TIMER4 COMPB

Timer/Counter4 Compare Match B

$0050

TIMER4 COMPD

Timer/Counter4 Compare Match D

$0052

TIMER4 OVF

Timer/Counter4 Overflow

$0054

TIMER4 FPF

Timer/Counter4

Fault Protection Interrupt

Table 9-1.

Reset and Interrupt Vectors (Continued)

Vector

No.

Program

Address(2)

Source

Interrupt Definition

ATmega16U4 Datasheet(PDF) 61 Page - ATMEL Corporation

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