ATmega128 datasheet(61/386 Pages) ATMEL

61 / 386 page

2467S–AVR–07/09

ATmega128

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 273.

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 address in this table added to

the start address of the boot Flash section.

3. The Interrupts on address $0030 - $0044 do not exist in ATmega103 compatibility mode.

Table 24 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.

Note:

The Boot Reset Address is shown in Table 112 on page 284. For the BOOTRST fuse “1” means

unprogrammed while “0” means programmed.

$003C(3)

USART1, RX

USART1, Rx Complete

$003E(3)

USART1, UDRE

USART1 Data Register Empty

$0040(3)

USART1, TX

USART1, Tx Complete

$0042(3)

TWI

Two-wire Serial Interface

$0044(3)

SPM READY

Store Program Memory Ready

Table 24. Reset and Interrupt Vectors Placement

BOOTRST

IVSEL

Reset Address

Interrupt Vectors Start Address

$0000

$0002

$0000

Boot Reset Address + $0002

Boot Reset Address

$0002

Boot Reset Address

Boot Reset Address + $0002

Table 23. Reset and Interrupt Vectors (Continued)

Vector

No.

Program

Address(2)

Source

Interrupt Definition

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