ATmega64A datasheet(63/392 Pages) ATMEL

63 / 392 page

8160C–AVR–07/09

ATmega64A

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 0x0002

0x0002

jmp

EXT_INT0

; IRQ0 Handler

0x0004

jmp

EXT_INT1

; IRQ1 Handler

;

0x0044

jmp

SPM_RDY

; Store Program Memory Ready Handler

;

.org 0x7000

0x7000

RESET:

ldi

r16,high(RAMEND); Main program start

0x7001

out

SPH,r16

; Set Stack Pointer to top of RAM

0x7002

ldi

r16,low(RAMEND)

0x7003

out

SPL,r16

0x7004

sei

; Enable interrupts

0x7005

<instr>

xxx

When the BOOTRST Fuse is programmed, the Boot section size set to 8K bytes 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:

Address Labels

Code

Comments

;

.org 0x7000

0x7000

jmp

RESET

; Reset handler

0x7002

jmp

EXT_INT0

; IRQ0 Handler

0x7004

jmp

EXT_INT1

; IRQ1 Handler

;

0x7044

jmp

SPM_RDY ; Store Program Memory Ready Handler

0x7046

RESET:

ldi

r16,high(RAMEND); Main program start

0x7047

out

SPH,r16

; Set Stack Pointer to top of RAM

0x7048

ldi

r16,low(RAMEND)

0x7049

out

SPL,r16

0x704A

sei

; Enable interrupts

0x704B

<instr>

xxx

11.2.1

Moving Interrupts Between Application and Boot Space

The General Interrupt Control Register controls the placement of the Interrupt Vector table.

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