61
8025I–AVR–02/09
ATmega48P/88P/168P/328P
When the BOOTRST Fuse is unprogrammed, the Boot section size set to 2K 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 in ATmega88P is:
Address Labels Code Comments
0x000 RESET: ldi r16,high(RAMEND); Main program start
0x001 out SPH,r16 ; Set Stack Pointer to top of RAM
0x002 ldi r16,low(RAMEND)
0x003 out SPL,r16
0x004 sei ; Enable interrupts
0x005 <instr> xxx
;
.org 0xC01
0xC01 rjmp EXT_INT0 ; IRQ0 Handler
0xC02 rjmp EXT_INT1 ; IRQ1 Handler
... ... ... ;
0xC19 rjmp SPM_RDY ; Store Program Memory Ready Handler
When the BOOTRST Fuse is programmed and the Boot section size set to 2K bytes, the most
typical and general program setup for the Reset and Interrupt Vector Addresses in ATmega88P
is:
Address Labels Code Comments
.org 0x001
0x001 rjmp EXT_INT0 ; IRQ0 Handler
0x002 rjmp EXT_INT1 ; IRQ1 Handler
... ... ... ;
0x019 rjmp SPM_RDY ; Store Program Memory Ready Handler
;
.org 0xC00
0xC00 RESET: ldi r16,high(RAMEND); Main program start
0xC01 out SPH,r16 ; Set Stack Pointer to top of RAM
0xC02 ldi r16,low(RAMEND)
0xC03 out SPL,r16
0xC04 sei ; Enable interrupts
0xC05 <instr> xxx
When the BOOTRST Fuse is programmed, the Boot section size set to 2K 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 in ATmega88P is:
Address Labels Code Comments
;
.org 0xC00
0xC00 rjmp RESET ; Reset handler
0xC01 rjmp EXT_INT0 ; IRQ0 Handler
0xC02 rjmp EXT_INT1 ; IRQ1 Handler
... ... ... ;
0xC19 rjmp SPM_RDY ; Store Program Memory Ready Handler
;
0xC1A RESET: ldi r16,high(RAMEND); Main program start
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