ATMEGA640 datasheet(106/436 Pages) MICROCHIP

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106

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

When the BOOTRST Fuse is programmed and the Boot section size set to 8Kbytes, the most typical and general

program setup for the Reset and Interrupt Vector Addresses is:

Address

Labels Code

Comments

.org 0x0002

0x00002

jmp

EXT_INT0

; IRQ0 Handler

0x00004

jmp

EXT_INT1

; IRQ1 Handler

...

;

0x00070

jmp

USART3_TXC

; USART3 TX Complete Handler

;

.org 0x1F000

0x1F000

RESET: ldi

r16,high(RAMEND); Main program start

0x1F001

out

SPH,r16

; Set Stack Pointer to top of RAM

0x1F002

ldi

r16,low(RAMEND)

0x1F003

out

SPL,r16

0x1F004

sei

; Enable interrupts

0x1F005

<instr>

xxx

When the BOOTRST Fuse is programmed, the Boot section size set to 8Kbytes and the IVSEL bit in the MCUCR

Interrupt Vector Addresses is:

Address

Labels

Code

Comments

;

.org 0x1F000

0x1F000

jmp

RESET

; Reset handler

0x1F002

jmp

EXT_INT0

; IRQ0 Handler

0x1F004

jmp

EXT_INT1

; IRQ1 Handler

...

;

0x1F070

jmp

USART3_TXC

; USART3 TX Complete Handler

;

0x1F072

RESET:

ldi

r16,high(RAMEND) ; Main program start

0x1F073

out

SPH,r16

; Set Stack Pointer to top of RAM

0x1F074

ldi

r16,low(RAMEND)

0x1F075

out

SPL,r16

0x1F076

sei

; Enable interrupts

0x1FO77

<instr>

xxx

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