Rainbow Electronics ATmega3290P_V - Manual (Page 51)

51
ATmega329/339/649/659
2552H–AVR–11/06
When the BOOTRST Fuse is unprogrammed, the Boot section size set to 4K 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
0x0000 RESET: ldi r16,high(RAMEND); Main program start
0x0001 out SPH,r16 ; Set Stack Pointer to top of
RAM
0x0002 ldi r16,low(RAMEND)
0x0003 out SPL,r16
0x0004 sei ; Enable interrupts
0x0005 xxx
;
.org 0x3802/0x7802
0x3804/0x7804 jmp EXT_INT0 ; IRQ0 Handler
0x3806/0x7806 jmp PCINT0 ; PCINT0 Handler
... ... ... ;
0x1C2C 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 0x0002
0x0002 jmp EXT_INT0 ; IRQ0 Handler
0x0004 jmp PCINT0 ; PCINT0 Handler
... ... ... ;
0x002C jmp SPM_RDY ; Store Program Memory Ready
Handler
;
.org 0x3800/0x7800
0x3800/0x7801RESET:ldir16,high(RAMEND); Main program start
0x3801/0x7801 out SPH,r16 ; Set Stack Pointer to top of RAM
0x3802/0x7802 ldi r16,low(RAMEND)
0x3803/0x7803 out SPL,r16
0x3804/0x7804 sei ; Enable interrupts
0x3805/0x7805 xxx
When the BOOTRST Fuse is programmed, the Boot section size set to 4K bytes and the
IVSEL bit in the MCUCR Register is set before any interrupts are enabled, the most typ-
ical and general program setup for the Reset and Interrupt Vector Addresses is:
Address Labels Code Comments
;
.org 0x3800/0x7800
0x3800/0x7800 jmp RESET ; Reset handler
0x3802/0x7802 jmp EXT_INT0 ; IRQ0 Handler
0x3804/0x7804 jmp PCINT0 ; PCINT0 Handler
... ... ... ;
0x382C/0x782C jmp SPM_RDY ; Store Program Memory Ready Handler
;