Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 47)

ATmega169V/L

2514A–AVR–08/02

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 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 <instr> xxx

;

.org 0x1C02

0x1C02 jmp EXT_INT0 ; IRQ0 Handler

0x1C04 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 2K 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 0x1C00

0x1C00 RESET: ldi r16,high(RAMEND) ; Main program start

0x1C01 out SPH,r16 ; Set Stack Pointer to top of RAM

0x1C02 ldi r16,low(RAMEND)

0x1C03 out SPL,r16

0x1C04 sei ; Enable interrupts

0x1C05 <instr> xxx

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 47