ATmega1284P datasheet(60/380 Pages) ATMEL

60 / 380 page

8059D–AVR–11/09

ATmega1284P

Notes:

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

reset, see ”Memory Programming” on page 291.

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 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 24-7 on page 288. 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

ATmega1284P is:

$0036

SPM_READY

Store Program Memory Ready

$0038

USART1_RX

USART1 Rx Complete

$003A

USART1_UDRE

USART1 Data Register Empty

$003C

USART1_TX

USART1 Tx Complete

$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_OVF

Timer/Counter3 Overflow

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

Address

Labels

Code

Comments

0x0000

jmp

RESET

; Reset

0x0002

jmp

INT0

; IRQ0

0x0004

jmp

INT1

; IRQ1

0x0006

jmp

INT2

; IRQ2

0x0008

jmp

PCINT0

; PCINT0

0x000A

jmp

PCINT1

; PCINT1

0x000C

jmp

PCINT2

; PCINT2

0x000E

jmp

PCINT3

; PCINT3

0x0010

jmp

WDT

; Watchdog Timeout

0x0012

jmp

TIM2_COMPA

; Timer2 CompareA

0x0014

jmp

TIM2_COMPB

; Timer2 CompareB

0x0016

jmp

TIM2_OVF

; Timer2 Overflow

Table 10-1.

Reset and Interrupt Vectors (Continued)

Vector

No.

Program

Address(2)

Source

Interrupt Definition

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