Atmel ATmega8535L - Page 48

48
ATmega8535(L)
2502K–AVR–10/06
AddressLabels 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
... .... .. ;
0xC14 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 is:
AddressLabels Code Comments
.org 0x001
0x001 rjmp EXT_INT0 ; IRQ0 Handler
0x002 rjmp EXT_INT1 ; IRQ1 Handler
... ... . .. ;
0x014 rjmp SPM_RDY ; Store Program Memory Ready Handler
;
.org 0xC00
0xC00RESET: 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 GICR Register is set before any interrupts are enabled, the most typical
and general program setup for the Reset and Interrupt Vector Addresses is:
AddressLabels Code Comments
.org 0xC00
0xC00 rjmp RESET ; Reset handler
0xC01 rjmp EXT_INT0 ; IRQ0 Handler
0xC02 rjmp EXT_INT1 ; IRQ1 Handler
... ... . .. ;
0xC14 rjmp SPM_RDY ; Store Program Memory Ready Handler
;
0xC15RESET: ldi r16,high(RAMEND) ;Main program start
0xC16 out SPH,r16 ; Set Stack Pointer to top of RAM
0xC17 ldi r16,low(RAMEND)
0xC18 out SPL,r16
0xC19 sei ; Enable interrupts
0xC20 <instr> xxx