Rainbow Electronics ATmega32L - Manual (Page 44)

44
ATmega32(L)
2503C–AVR–10/02
When the BOOTRST Fuse is unprogrammed, the Boot section size set to 4K bytes and
the IVSEL bit in the GICR 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
$000 RESET: ldi r16,high(RAMEND) ; Main program start
$001 out SPH,r16 ; Set stack pointer to top of RAM
$002 ldi r16,low(RAMEND)
$003 out SPL,r16
$004 sei ; Enable interrupts
$005 <instr> xxx
;
.org $3802
$3802 jmp EXT_INT0 ; IRQ0 Handler
$3804 jmp EXT_INT1 ; IRQ1 Handler
... .... .. ;
$3828 jmp SPM_RDY ; Store Program Memory Ready Handler
When the BOOTRST Fuse is programmed and the Boot section size set to 4K bytes, the
most typical and general program setup for the Reset and Interrupt Vector Addresses is:
Address Labels Code Comments
.org $002
$002 jmp EXT_INT0 ; IRQ0 Handler
$004 jmp EXT_INT1 ; IRQ1 Handler
... .... .. ;
$028 jmp SPM_RDY ; Store Program Memory Ready Handler
;
.org $3800
$3800 RESET: ldi r16,high(RAMEND) ; Main program start
$3801 out SPH,r16 ; Set stack pointer to top of RAM
$3802 ldi r16,low(RAMEND)
$3803 out SPL,r16
$3804 sei ; Enable interrupts
$3805 <instr> xxx
When the BOOTRST Fuse is programmed, the Boot section size set to 4K bytes and the
IVSEL bit in the GICR 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 $3800
$3800 jmp RESET ; Reset handler
$3802 jmp EXT_INT0 ; IRQ0 Handler
$3804 jmp EXT_INT1 ; IRQ1 Handler
... .... .. ;
$3828 jmp SPM_RDY ; Store Program Memory Ready Handler
;
$382A RESET: ldi r16,high(RAMEND) ; Main program start
$382B out SPH,r16 ; Set stack pointer to top of RAM
$382C ldi r16,low(RAMEND)
$382D out SPL,r16
$382E sei ; Enable interrupts
$382F <instr> xxx