AT90SCR100 datasheet(64/433 Pages) ATMEL

64 / 433 page

TPR0327AY–SMS–30Jan09

AT90SCR100

Notes: 1. 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.

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

reset, see “Memory Programming” on page 377.

Table 10-2 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.

Note:

1. The Boot Reset Address is shown in Table 28-7 on page 376. For the BOOTRST Fuse “1”

means unprogrammed while “0” means programmed.

The most typical and general program setup for the Reset and Interrupt Vector Addresses in

AT90SCR100 is:

$0038

KEYBOARD

Keyboard Input Changed

$003A

AES

AES Block Operation Ended

$003C

HSSPI

High-Speed SPI Interface

$003E

USB Endpoint

USB Endpoint linked Interrupt

$0040

USB Protocol

USB Protocol Interrupt

$0042

SCIB

Smart Card Reader Interface

$0044

USB Host Control

USB Host Controller Interrupt

$0046

USB Host Pipe

USB Host Pipe Interrupt

$0048

CPRES

Card Presence Detection

$004A

PCINT3

Pin Change Interrupt Request 3

Table 10-2.

Reset and Interrupt Vectors Placement(1)

BOOTRST

IVSEL

Reset Address

Interrupt Vectors Start Address

0x0000

0x0002

0x0000

Boot Reset Address + 0x0002

Boot Reset Address

0x0002

Boot Reset Address

Boot Reset Address + 0x0002

Table 10-1.

Reset and Interrupt Vectors (Continued)

Vector

No.

Program

Address(1)

Source

Interrupt Definition

Addr

ess

Labels

Code

Comments

jmp

RESET

; Reset Handler

0x02

jmp

INT0

; IRQ0 Handler

0x04

jmp

INT1

; IRQ1 Handler

0x06

jmp

INT2

; IRQ2 Handler

0x08

jmp

INT3

; IRQ3 Handler

0x0A

jmp

PCINT0

; PCINT0 Handler

0x0C

jmp

PCINT1

; PCINT1 Handler

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