Datasheet

8018P–AVR–08/10

ATmega169P

Table 11-2 on page 57 shows reset and Interrupt Vectors placement for the various combina-

tions of BOOTRST and IVSEL settings. If the program never enables an interrupt source, the

Interrupt Vectors are not used, and regular program code can be placed at these locations. This

is also the case if the Reset Vector is in the Application section while the Interrupt Vectors are in

the Boot section or vice versa.

Note: 1. The Boot Reset Address is shown in Table 26-6 on page 292. 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

ATmega169P is:

Address Labels Code Comments

0x0000 jmp RESET ; Reset Handler

0x0002 jmp EXT_INT0 ; IRQ0 Handler

0x0004 jmp PCINT0 ; PCINT0 Handler

0x0006 jmp PCINT1 ; PCINT0 Handler

0x0008 jmp TIM2_COMP ; Timer2 Compare Handler

0x000A jmp TIM2_OVF ; Timer2 Overflow Handler

0x000C jmp TIM1_CAPT ; Timer1 Capture Handler

0x000E jmp TIM1_COMPA ; Timer1 CompareA Handler

0x0010 jmp TIM1_COMPB ; Timer1 CompareB Handler

0x0012 jmp TIM1_OVF ; Timer1 Overflow Handler

0x0014 jmp TIM0_COMP ; Timer0 Compare Handler

0x0016 jmp TIM0_OVF ; Timer0 Overflow Handler

0x0018 jmp SPI_STC ; SPI Transfer Complete Handler

0x001A jmp USART_RXCn ; USART0 RX Complete Handler

0x001C jmp USART_DRE ; USART0,UDRn Empty Handler

0x001E jmp USART_TXCn ; USART0 TX Complete Handler

0x0020 jmp USI_STRT ; USI Start Condition Handler

0x0022 jmp USI_OVFL ; USI Overflow Handler

0x0024 jmp ANA_COMP ; Analog Comparator Handler

0x0026 jmp ADC ; ADC Conversion Complete Handler

0x0028 jmp EE_RDY ; EEPROM Ready Handler

0x002A jmp SPM_RDY ; SPM Ready Handler

0x002C jmp LCD_SOF ; LCD Start of Frame Handler

;

0x002E RESET: ldi r16, high(RAMEND); Main program start

0x002F out SPH,r16 Set Stack Pointer to top of RAM

0x0030 ldi r16, low(RAMEND)

Table 11-2. Reset and Interrupt Vectors Placement

(1)

BOOTRST IVSEL Reset Address Interrupt Vectors Start Address

1 0 0x0000 0x0002

1 1 0x0000 Boot Reset Address + 0x0002

0 0 Boot Reset Address 0x0002

0 1 Boot Reset Address Boot Reset Address + 0x0002