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 Interrupt 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 (nameIF) 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 (nameIE) bit in the peripheral's Interrupt Control (peripheral.INTCTRL) register.

The naming of the registers may vary slightly in some peripherals.

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.

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

Table 1. Interrupt Vector Mapping
Vector Number	Program Address (word)	Peripheral Source (name)	Description
0	0x00	RESET
1	0x01	CRCSCAN_NMI	Non-Maskable Interrupt available for CRCSCAN
2	0x02	BOD_VLM	Voltage Level Monitor interrupt
3	0x03	PORTA_PORT	Port A interrupt
4	0x04	PORTB_PORT	Port B interrupt⁽¹⁾
5	0x05	PORTC_PORT	Port C interrupt⁽¹⁾
6	0x06	RTC_CNT	Real-Time Counter interrupt
7	0x07	RTC_PIT	Periodic Interrupt Timer interrupt (in RTC peripheral)
8	0x08	TCA0_OVF TCA0_LUNF	Normal: Timer Counter Type A Overflow interrupt. Split: Timer Counter Type A Low Underflow interrupt.
9	0x09	TCA0_HUNF	Normal: Unused. Split: Timer/Counter Type A High Underflow.
10	0x0A	TCA0_CMP0 TCA0_LCMP0	Normal: Timer/Counter Type A Compare Channel 0 interrupt. Split: Timer/Counter Type A Low byte Compare Channel 0 interrupt.
11	0x0B	TCA0_CMP1 TCA0_LCMP1	Normal: Timer/Counter Type A Compare Channel 1 interrupt. Split: Timer/Counter Type A Low byte Compare Channel 1 interrupt.
12	0x0C	TCA0_CMP2 TCA0_LCMP2	Normal: Timer/Counter Type A Compare Channel 2 interrupt. Split: Timer/Counter Type A Low byte Compare Channel 2 interrupt.
13	0x0D	TCB0_INT	Timer Counter Type B Capture interrupt
17	0x10	AC0_AC	Analog Comparator interrupt
20	0x11	ADC0_RESRDY	Analog-to-Digital Converter Result Ready interrupt
21	0x12	ADC0_WCOMP	Analog-to-Digital Converter Window Compare interrupt
24	0x13	TWI0_TWIS	Two-Wire Interface/I²C Client interrupt
25	0x14	TWI0_TWIM	Two-Wire Interface/I²C Host interrupt
26	0x15	SPI0_INT	Serial Peripheral Interface interrupt
27	0x16	USART0_RXC	Universal Synchronous and Asynchronous Receiver and Transmitter Receive Complete interrupt
28	0x17	USART0_DRE	Universal Synchronous and Asynchronous Receiver and Transmitter Data Ready interrupt
29	0x18	USART0_TXC	Universal Synchronous and Asynchronous Receiver and Transmitter Transmit Complete interrupt
30	0x19	NVMCTRL_EE	Nonvolatile Memory EEPROM Ready interrupt

Note:

1.The availability of the port pins depends on the device pin count. PORTB is available for devices with 14 pins or more. PORTC is available for devices with 20 pins or more.