60
8025I–AVR–02/09
ATmega48P/88P/168P/328P
Note: 1. The Boot Reset Address is shown in Table 24-7 on page 289. For the BOOTRST Fuse “1”
means unprogrammed while “0” means programmed.
The most typical and general program setup for the Reset and Interrupt Vector Addresses in
ATmega88P is:
Address Labels Code Comments
0x000 rjmp RESET ; Reset Handler
0x001 rjmp EXT_INT0 ; IRQ0 Handler
0x002 rjmp EXT_INT1 ; IRQ1 Handler
0x003 rjmp PCINT0 ; PCINT0 Handler
0x004 rjmp PCINT1 ; PCINT1 Handler
0x005 rjmp PCINT2 ; PCINT2 Handler
0x006 rjmp WDT ; Watchdog Timer Handler
0x007 rjmp TIM2_COMPA ; Timer2 Compare A Handler
0X008 rjmp TIM2_COMPB ; Timer2 Compare B Handler
0x009 rjmp TIM2_OVF ; Timer2 Overflow Handler
0x00A rjmp TIM1_CAPT ; Timer1 Capture Handler
0x00B rjmp TIM1_COMPA ; Timer1 Compare A Handler
0x00C rjmp TIM1_COMPB ; Timer1 Compare B Handler
0x00D rjmp TIM1_OVF ; Timer1 Overflow Handler
0x00E rjmp TIM0_COMPA ; Timer0 Compare A Handler
0x00F rjmp TIM0_COMPB ; Timer0 Compare B Handler
0x010 rjmp TIM0_OVF ; Timer0 Overflow Handler
0x011 rjmp SPI_STC ; SPI Transfer Complete Handler
0x012 rjmp USART_RXC ; USART, RX Complete Handler
0x013 rjmp USART_UDRE ; USART, UDR Empty Handler
0x014 rjmp USART_TXC ; USART, TX Complete Handler
0x015 rjmp ADC ; ADC Conversion Complete Handler
0x016 rjmp EE_RDY ; EEPROM Ready Handler
0x017 rjmp ANA_COMP ; Analog Comparator Handler
0x018 rjmp TWI ; 2-wire Serial Interface Handler
0x019 rjmp SPM_RDY ; Store Program Memory Ready Handler
;
0x01ARESET: ldi r16, high(RAMEND); Main program start
0x01B out SPH,r16 ; Set Stack Pointer to top of RAM
0x01C ldi r16, low(RAMEND)
0x01D out SPL,r16
0x01E sei ; Enable interrupts
0x01F <instr> xxx
Table 9-3. Reset and Interrupt Vectors Placement in ATmega88P
(1)
BOOTRST IVSEL Reset Address Interrupt Vectors Start Address
1 0 0x000 0x001
1 1 0x000 Boot Reset Address + 0x001
0 0 Boot Reset Address 0x001
0 1 Boot Reset Address Boot Reset Address + 0x001
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