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ATMEGA644 Datasheet(PDF) 59 Page - ATMEL Corporation |
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ATMEGA644 Datasheet(HTML) 59 Page - ATMEL Corporation |
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59 / 374 page  59 2593L–AVR–02/07 ATmega644 When the BOOTRST Fuse is unprogrammed, the Boot section size set to 8K 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 0x00000 RESET: ldi r16,high(RAMEND); Main program start 0x00001 out SPH,r16 ; Set Stack Pointer to top of RAM 0x00002 ldi r16,low(RAMEND) 0x00003 out SPL,r16 0x00004 sei ; Enable interrupts 0x00005 <instr> xxx ; .org 0x1F002 0x1F002 jmp EXT_INT0 ; IRQ0 Handler 0x1F004 jmp EXT_INT1 ; IRQ1 Handler ... ... ... ; 0x1FO36 jmp SPM_RDY ; SPM Ready Handler When the BOOTRST Fuse is programmed and the Boot section size set to 8K bytes, the most typical and general program setup for the Reset and Interrupt Vector Addresses is: Address Labels Code Comments .org 0x0002 0x00002 jmp EXT_INT0 ; IRQ0 Handler 0x00004 jmp EXT_INT1 ; IRQ1 Handler ... ... ... ; 0x00036 jmp SPM_RDY ; SPM Ready Handler ; .org 0x1F000 0x1F000 RESET: ldi r16,high(RAMEND); Main program start 0x1F001 out SPH,r16 ; Set Stack Pointer to top of RAM 0x0030 jmp ADC ; ADC Conversion Complete Handler 0x0032 jmp EE_RDY ; EEPROM Ready Handler 0x0034 jmp TWI ; 2-wire Serial Handler 0x0036 jmp SPM_RDY ; SPM Ready Handler ; 0x003E RESET : ldi r16, high(RAMEND) ; Main program start 0x003F out SPH,r16 ; Set Stack Pointer to top of RAM 0x0040 ldi r16, low(RAMEND) 0x0041 out SPL,r16 0x0042 sei ; Enable interrupts 0x0043 <inst r> xxx ... ... ... ... |
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