ATMEGA64-16MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64-16MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

Table 23. Reset and Interrupt Vectors (Continued)

Vector

No.

32

33

34

35

Program

Address(2)

0x003E(3)

0x0040(3)

0x0042(3)

0x0044(3)

Source

USART1, UDRE

USART1, TX

TWI

SPM READY

Interrupt Definition

USART1 Data Register Empty

USART1, Tx Complete

Two-wire Serial Interface

Store Program Memory Ready

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 277.

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 0x0030 - 0x0044 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 loca-

tions. 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.

Table 24. Reset and Interrupt Vectors Placement(1)

BOOTRST IVSEL Reset Address

Interrupt Vectors Start Address

1

0

0x0000

0x0002

1

1

0x0000

Boot Reset Address + 0x0002

0

0

Boot Reset Address

0x0002

0

1

Boot Reset Address

Boot Reset Address + 0x0002

Note: 1. The Boot Reset Address is shown in Table 113 on page 289. 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 ATmega64 is:

Address Labels Code

Comments

0x0000

jmp

RESET

; Reset Handler

0x0002

jmp

EXT_INT0

; IRQ0 Handler

0x0004

jmp

EXT_INT1

; IRQ1 Handler

0x0006

jmp

EXT_INT2

; IRQ2 Handler

0x0008

jmp

EXT_INT3

; IRQ3 Handler

0x000A

jmp

EXT_INT4

; IRQ4 Handler

0x000C

jmp

EXT_INT5

; IRQ5 Handler

0x000E

jmp

EXT_INT6

; IRQ6 Handler

0x0010

jmp

EXT_INT7

; IRQ7 Handler

0x0012

jmp

TIM2_COMP ; Timer2 Compare Handler

0x0014

jmp

TIM2_OVF

; Timer2 Overflow Handler

0x0016

jmp

TIM1_CAPT ; Timer1 Capture Handler

0x0018

jmp

TIM1_COMPA ; Timer1 CompareA Handler

0x001A

jmp

TIM1_COMPB ; Timer1 CompareB Handler

0x001C

jmp

TIM1_OVF

; Timer1 Overflow Handler

60 ATmega64(L)

2490G–AVR–03/04

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