8.2 Interrupt Vector Mapping

Each interrupt vector is connected to one peripheral instance, as shown in the table below. A peripheral can have one or more interrupt sources. For more details on the available interrupt sources, see the Interrupt section in the Functional Description of the respective peripheral.

An interrupt flag is set in the Interrupt Flags register of the peripheral (peripheral.INTFLAGS) when the interrupt condition occurs, even if the interrupt is not enabled.

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

When the corresponding interrupt is enabled, an interrupt request is generated, and the interrupt flag is set. Interrupts must be enabled globally to generate interrupt requests. The interrupt request remains active until clearing the interrupt flag. See the peripheral's INTFLAGS register for details on clearing interrupt flags.

Table 8-3. Interrupt Vector Mapping
Vector Number	Program Address (word)	Peripheral Source	Description	14- Pin	20- Pin	28- Pin	32- Pin
0	0x00	RESET		X	X	X	X
1	0x02	NMI	Non-Maskable Interrupt available for: CRCSCAN CLKCTRL	X	X	X	X
2	0x04	BOD_VLM	Voltage Level Monitor Interrupt	X	X	X	X
3	0x06	CLKCTRL_CFD	External crystal oscillator or clock source failure	X	X	X	X
4	0x08	RTC_RTC	Real-Time Counter Overflow or Compare Match Interrupt	X	X	X	X
5	0x0A	RTC_PIT	Real-Time Counter Periodic Interrupt	X	X	X	X
6	0x0C	CCL_CCL	Configurable Custom Logic Interrupt	X	X	X	X
7	0X0E	USB_BUS	USB Bus Event Interrupt	X	X	X	X
8	0x10	USB_TAC	USB Transaction Complete Interrupt	X	X	X	X
9	0x12	PORTA_PORT	PORTA External Interrupt	X	X	X	X
10	0x14	TCA0 _OVF TCA0_LUNF	Normal: Timer/Counter Type A Overflow Interrupt Split: Timer/Counter Type A Low Underflow Interrupt	X	X	X	X
11	0x16	TCA0_HUNF	Normal: Unused Split: Timer/Counter Type A High Underflow Interrupt	X	X	X	X
12	0x18	TCA0_CMP0 TCA0_LCMP0	Normal: Timer/Counter Type A Compare 0 Interrupt Split: Timer/Counter Type A Low Compare 0 Interrupt	X	X	X	X
13	0x1A	TCA0_CMP1 TCA0_LCMP1	Normal: Timer/Counter Type A Compare 1 Interrupt Split: Timer/Counter Type A Low Compare 1 Interrupt	X	X	X	X
14	0x1C	TCA0_CMP2 TCA0_LCMP2	Normal: Timer/Counter Type A Compare 2 Interrupt Split: Timer/Counter Type A Low Compare 2 Interrupt	X	X	X	X
15	0x1E	TCB0_INT	Timer Counter Type B Capture/Overflow Interrupt	X	X	X	X
16	0x20	TWI0_TWIS	Two-Wire Interface Client Interrupt	X	X	X	X
17	0x22	TWI0_TWIM	Two-Wire Interface Host Interrupt	X	X	X	X
18	0x24	SPI0_INT	Serial Peripheral Interface Interrupt	X	X	X	X
19	0x26	USART0_RXC	Universal Synchronous Asynchronous Receiver and Transmitter Receive Complete Interrupt	X	X	X	X
20	0x28	USART0_DRE	Universal Synchronous Asynchronous Receiver and Transmitter Data Register Empty Interrupt	X	X	X	X
21	0x2A	USART0_TXC	Universal Synchronous Asynchronous Receiver and Transmitter Transmit Complete Interrupt	X	X	X	X
22	0x2C	PORTD_PORT	PORTD External Interrupt	X	X	X	X
23	0x2E	PORTC_PORT	PORTC External Interrupt	X	X	X	X
24	0x30	PORTF_PORT	PORTF External Interrupt	X	X	X	X
25	0x32	NVMCTRL_NVMREADY	Nonvolatile Memory Controller EEPROM/Flash Ready Interrupt	X	X	X	X
26	0x34	USART1_RXC	Universal Synchronous Asynchronous Receiver and Transmitter Receive Complete Interrupt	X	X	X	X
27	0x36	USART1_DRE	Universal Synchronous Asynchronous Receiver and Transmitter Data Register Empty Interrupt	X	X	X	X
28	0x38	USART1_TXC	Universal Synchronous Asynchronous Receiver and Transmitter Transmit Complete Interrupt	X	X	X	X
29	0x3A	TCB1_INT	Timer Counter Type B Capture/Overflow Interrupt	X	X	X	X
30	0x3C	AC0_AC	Analog Comparator Interrupt	X	X	X	X
31	0x3E	ADC0_ERROR	Analog-to-Digital Converter Error Interrupt	X	X	X	X
32	0x40	ADC0_RESRDY	Analog-to-Digital Converter Result Ready Interrupt	X	X	X	X
33	0x42	ADC0_SMPRDY	Analog-to-Digital Converter Sample Ready Interrupt	X	X	X	X