8.2 Interrupt Vector Mapping

Each of the interrupt vectors is connected to one peripheral instance, as shown in the table below. A peripheral can have one or more interrupt sources. See the ‘Interrupts’ section in the ‘Functional Description’ of the respective peripheral for more details on the available interrupt sources.

When the interrupt condition occurs, an Interrupt Flag is set in the Interrupt Flags register of the peripheral (peripheral.INTFLAGS).

An interrupt is enabled or disabled by writing to the corresponding Interrupt Enable bit in the peripheral's Interrupt Control (peripheral.INTCTRL) register.

An interrupt request is generated when the corresponding interrupt is enabled, and the Interrupt Flag is set. The interrupt request remains active until the Interrupt Flag is cleared. See the peripheral's INTFLAGS register for details on how to clear Interrupt Flags.

Note: Interrupts must be enabled globally for interrupt requests to be generated.

Table 8-2. Interrupt Vector Mapping
Vector Number	Program Address (word)	Peripheral Source (name)	Description	28- Pin	32- Pin	40- Pin	48- Pin
0	0x00	RESET		X	X	X	X
1	0x02	CRCSCAN_NMI	Non-Maskable Interrupt available for CRCSCAN	X	X	X	X
2	0x04	BOD_VLM	Voltage Level Monitor interrupt	X	X	X	X
3	0x06	RTC_CNT	Real Time Counter - Overflow or compare match interrupt	X	X	X	X
4	0x08	RTC_PIT	Real Time Counter - Periodic Interrupt Timer interrupt	X	X	X	X
5	0x0A	CCL_CCL	Configurable Custom Logic interrupt	X	X	X	X
6	0x0C	PORTA_PORT	Port A - External interrupt	X	X	X	X
7	0x0E	TCA0_OVF TCA0_LUNF	Normal: Timer/Counter Type A Overflow interrupt Split: Timer/Counter Type A Low Underflow interrupt	X	X	X	X
8	0x10	TCA0_HUNF	Split: Timer/Counter Type A High Underflow interrupt	X	X	X	X
9	0x12	TCA0_CMP0 TCA0_LCMP0	Normal: Timer/Counter Type A Compare Channel 0 interrupt Split: Timer/Counter Type A Low Compare Channel 0 interrupt	X	X	X	X
10	0x14	TCA0_CMP1 TCA0_LCMP1	Normal: Timer/Counter Type A Compare Channel 1 interrupt Split: Timer/Counter Type A Low Compare Channel 1 interrupt	X	X	X	X
11	0x16	TCA0_CMP2 TCA0_LCMP2	Normal: Timer/Counter Type A Compare Channel 2 interrupt Split: Timer/Counter Type A Low Compare Channel 2 interrupt	X	X	X	X
12	0x18	TCB0_INT	Timer/Counter Type B Capture interrupt	X	X	X	X
13	0x1A	TCB1_INT	Timer/Counter Type B Capture interrupt	X	X	X	X
14	0x1C	TWI0_TWIS	Two Wire Interface - Client interrupt	X	X	X	X
15	0x1E	TWI0_TWIM	Two Wire Interface - Host interrupt	X	X	X	X
16	0x20	SPI0_INT	Serial Peripheral Interface interrupt	X	X	X	X
17	0x22	USART0_RCX	Universal Synchronous Asynchronous Receiver Transmitter - Receive Complete interrupt	X	X	X	X
18	0x24	USART0_DRE	Universal Synchronous Asynchronous Receiver Transmitter - Data Register Empty interrupt	X	X	X	X
19	0x26	USART0_TCX	Universal Synchronous Asynchronous Receiver Transmitter - Transmit Complete interrupt	X	X	X	X
20	0x28	PORTD_PORT	Port D - External interrupt	X	X	X	X
21	0x2A	AC0_AC	Analog Comparator - Compare interrupt	X	X	X	X
22	0x2C	ADC0_RESRDY	Analog-to-Digital Converter - Result Ready interrupt	X	X	X	X
23	0x2E	ADC0_WCOMP	Analog-to-Digital Converter - Window Compare interrupt	X	X	X	X
24	0x30	PORTC_PORT	Port C - External interrupt	X	X	X	X
25	0x32	TCB2_INT	Timer/Counter Type B Capture interrupt	X	X	X	X
26	0x34	USART1_RCX	Universal Synchronous Asynchronous Receiver Transmitter - Receive Complete interrupt	X	X	X	X
27	0x36	USART1_DRE	Universal Synchronous Asynchronous Receiver Transmitter - Data Register Empty interrupt	X	X	X	X
28	0x38	USART1_TCX	Universal Synchronous Asynchronous Receiver Transmitter - Transmit Complete interrupt	X	X	X	X
29	0x3A	PORTF_PORT	Port F - External interrupt	X	X	X	X
30	0x3C	NVMCTRL_EE	Non-Volatile Memory Controller - Ready interrupt	X	X	X	X
31	0x3E	USART2_RCX	Universal Synchronous Asynchronous Receiver Transmitter - Receive Complete interrupt	X	X	X	X
32	0x40	USART2_DRE	Universal Synchronous Asynchronous Receiver Transmitter - Data Register Empty interrupt	X	X	X	X
33	0x42	USART2_TCX	Universal Synchronous Asynchronous Receiver Transmitter - Transmit Complete interrupt	X	X	X	X
34	0x44	PORTB	Port B - External interrupt				X
35	0x46	PORTE	Port E - External interrupt			X	X
36	0x48	TCB3_INT	Timer/Counter Type B Capture interrupt			X	X
37	0x4A	USART3_RCX	Universal Synchronous Asynchronous Receiver Transmitter - Receive Complete interrupt			X	X
38	0x4C	USART3_DRE	Universal Synchronous Asynchronous Receiver Transmitter - Data Register Empty interrupt			X	X
39	0x4E	USART3_TCX	Universal Synchronous Asynchronous Receiver Transmitter - Transmit Complete interrupt			X	X

ATmega4808/4809

8.2 Interrupt Vector Mapping