Datasheet

When the BOOTRST fuse is unprogrammed, the Boot section size set to 8 Kbytes 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 is:

Adddress Labels Code Comments

$0000 RESET: ldi r16,high(RAMEND) ; Main program

start

$0001 out SPH,r16 ; Set stack

pointer to top of

RAM

$0002 RESET: ldi r16,low(RAMEND)

$0003 out SPL,r16

$0004 sei ; Enable

interrupts

$0005 <instr> xxx

;

.org $F002

$F002 jmp EXT_INT0 ; IRQ0 Handler

$F004 jmp EXT_INT1 ; IRQ1 Handler

:. :. :. ;

$F044 jmp SPM_RDY ; Store Program

Memory Ready

Handler

When the BOOTRST fuse is programmed and the Boot section size set to 8K bytes, the most typical and

general program setup for the Reset and Interrupt Vector Addresses is:

Address Labels Code Comments

.org $0002

$0002 jmp EXT_INT0 ; IRQ0 Handler

$0004 jmp EXT_INT1 ; IRQ1 Handler

:. :. :. ;

$0044 jmp SPM_RDY ; Store Program

Memory Handler

;

.org $F000

$F000 RESET: ldi r16,high(RAMEND) ; Main program

start

$F001 out SPH,r16 ; Set stack

pointer to top of

RAM

Atmel ATmega64A [DATASHEET]

Atmel-8160E-ATmega64A_Datasheet_Complete-09/2015