Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI Data Sheet

64

ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]

Atmel-8271H-AVR- ATmega-Datasheet_08/2014

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 

. 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 
ATmega168A/168PA is:

Address

Labels

Code

Comments

0x0000

jmp

RESET

; Reset Handler

0x0002

jmp

EXT_INT0

; IRQ0 Handler

0x0004

jmp

EXT_INT1

; IRQ1 Handler

0x0006

jmp

PCINT0

; PCINT0 Handler

0x0008

jmp

PCINT1

; PCINT1 Handler

0x000A

jmp

PCINT2

; PCINT2 Handler

0x000C

jmp

WDT

; Watchdog Timer Handler

0x000E

jmp

TIM2_COMPA

; Timer2 Compare A Handler

0x0010

jmp

TIM2_COMPB

; Timer2 Compare B Handler

0x0012

jmp

TIM2_OVF

; Timer2 Overflow Handler

0x0014

jmp

TIM1_CAPT

; Timer1 Capture Handler

0x0016

jmp

TIM1_COMPA

; Timer1 Compare A Handler

0x0018

jmp

TIM1_COMPB

; Timer1 Compare B Handler

0x001A

jmp

TIM1_OVF

; Timer1 Overflow Handler

0x001C

jmp

TIM0_COMPA

; Timer0 Compare A Handler

0x001E

jmp

TIM0_COMPB

; Timer0 Compare B Handler

0x0020

jmp

TIM0_OVF

; Timer0 Overflow Handler

0x0022

jmp

SPI_STC

; SPI Transfer Complete Handler

0x0024

jmp

USART_RXC

; USART, RX Complete Handler

0x0026

jmp

USART_UDRE

; USART, UDR Empty Handler

0x0028

jmp

USART_TXC

; USART, TX Complete Handler

0x002A

jmp

ADC

; ADC Conversion Complete Handler

0x002C

jmp

EE_RDY

; EEPROM Ready Handler

0x002E

jmp

ANA_COMP

; Analog Comparator Handler

0x0030

jmp

TWI

; 2-wire Serial Interface Handler

0x0032

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

0x0034

RESET:

ldi

r16, high(RAMEND); Main program start

0x0035

out 

SPH,r16

; Set Stack Pointer to top of RAM

0x0036

ldi r16, 

low(RAMEND)

0x0037

out SPL,r16

0x0038

sei

; Enable interrupts

0x0039

<instr>  xxx

  ...

...

...

 ... 

When the BOOTRST Fuse is unprogrammed, the Boot section size set to 2Kbytes and the IVSEL bit in the 
MCUCR Register is set before any interrupts are enabled, the most typical and general program setup for the 
Reset and Interrupt Vector Addresses in ATmega168A/168PA is:

Reset and Interrupt Vectors Placement in ATmega168A and ATmega168PA

1

0

0x000

0x002

1

1

0x000

Boot Reset Address + 0x0002

0

0

Boot Reset Address

0x002

0

1

Boot Reset Address

Boot Reset Address + 0x0002