Datasheet
109
2549O–AVR–05/12
ATmega640/1280/1281/2560/2561
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 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 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
14.3 Moving Interrupts Between Application and Boot Section
The MCU Control Register controls the placement of the Interrupt Vector table, see Code Exam-
ple below. For more details, see “Reset and Interrupt Handling” on page 18.