7.2 Interrupt Vector Mapping

Each of the 26 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 bit (nameIE) in the peripheral's Interrupt Control register (peripheral.INTCTRL).

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 7-2. Interrupt Vector Mapping
Vector Number Base Address Peripheral source
0 0x00 RESET
1 0x02 NMI - Non Maskable Interrupt from CRC
2 0x04 VLM - Voltage Level Monitor
3 0x06 PORTA - Port A
4 0x08 PORTB - Port B
5 0x0A PORTC - Port C
6 0x0C RTC - Real Time Counter
7 0x0E PIT - Periodic Interrupt Timer (in RTC peripheral)
8 0x10 TCA0 - Timer Counter Type A
13 0x1A TCB0 - Timer Counter Type B
14 0x1C TCB1 - Timer Counter Type B
15 0x1E TCD0 - Timer Counter Type D
17 0x22 AC0 – Analog Comparator
18 0x24 AC1 – Analog Comparator
19 0x26 AC2 – Analog Comparator
20 0x28 ADC0 – Analog-to-Digital Converter / PTC
22 0x2C ADC1 – Analog-to-Digital Converter
24 0x30 TWI0 - Two Wire Interface / I2C
26 0x34 SPI0 - Serial Peripheral Interface
27 0x36 USART0 - Universal Asynchronous Receiver-Transmitter
30 0x3C NVM - Non Volatile Memory