ATmega32A datasheet(46/352 Pages) ATMEL

46 / 352 page

8155B–AVR–07/09

ATmega32A

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 25-6 on page 263. 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

ATmega32A is:

Address

Labels

Code

Comments

$000

jmp

RESET

; Reset Handler

$002

jmp

EXT_INT0

; IRQ0 Handler

$004

jmp

EXT_INT1

; IRQ1 Handler

$006

jmp

EXT_INT2

; IRQ2 Handler

$008

jmp

TIM2_COMP

; Timer2 Compare Handler

$00A

jmp

TIM2_OVF

; Timer2 Overflow Handler

$00C

jmp

TIM1_CAPT

; Timer1 Capture Handler

$00E

jmp

TIM1_COMPA

; Timer1 CompareA Handler

$010

jmp

TIM1_COMPB

; Timer1 CompareB Handler

$012

jmp

TIM1_OVF

; Timer1 Overflow Handler

$014

jmp

TIM0_COMP

; Timer0 Compare Handler

$016

jmp

TIM0_OVF

; Timer0 Overflow Handler

$018

jmp

SPI_STC

; SPI Transfer Complete Handler

$01A

jmp

USART_RXC

; USART RX Complete Handler

$01C

jmp

USART_UDRE

; UDR Empty Handler

$01E

jmp

USART_TXC

; USART TX Complete Handler

$020

jmp

ADC

; ADC Conversion Complete Handler

$022

jmp

EE_RDY

; EEPROM Ready Handler

$024

jmp

ANA_COMP

; Analog Comparator Handler

$026

jmp

TWI

; Two-wire Serial Interface Handler

$028

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

$02A

RESET:

ldi

r16,high(RAMEND); Main program start

$02B

out

SPH,r16

; Set Stack Pointer to top of RAM

$02C

ldi

r16,low(RAMEND)

$02D

out

SPL,r16

$02E

sei

; Enable interrupts

$02F

<instr>

xxx

Table 11-2.

Reset and Interrupt Vectors Placement

(1)

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

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