10.2.2 Interrupt Line Mapping

Each of the interrupt lines is connected to one peripheral instance, as shown in the table below. Each peripheral can have one or more interrupt flags, located in the peripheral’s Interrupt Flag Status and Clear (INTFLAG) register.

An interrupt flag is set when the interrupt condition occurs. Each interrupt in the peripheral can be individually enabled by writing a '1' to the corresponding bit in the peripheral’s Interrupt Enable Set (INTENSET) register, and disabled by writing '1' to the corresponding bit in the peripheral’s Interrupt Enable Clear (INTENCLR) register.

An interrupt request is generated from the peripheral when the interrupt flag is set and the corresponding interrupt is enabled.

The interrupt requests for one peripheral are ORed together on system level, generating one interrupt request for each peripheral. An interrupt request will set the corresponding interrupt pending bit in the NVIC interrupt pending registers (SETPEND/CLRPEND bits in ISPR/ICPR).

For the NVIC to activate the interrupt, it must be enabled in the NVIC interrupt enable register (SETENA/CLRENA bits in ISER/ICER). The NVIC interrupt priority registers IPR0-IPR7 provide a priority field for each interrupt.

Table 10-3. Interrupt Line Mapping
Peripheral sourceNVIC line
EIC NMI – External Interrupt ControllerNMI

PM – Power Manager

MCLK - Main Clock

OSCCTRL - Oscillators Controller

OSC32KCTRL - 32KHz Oscillators Controller

PAC - Peripheral Access Controller

SUPC - Supply Controller

0
WDT – Watchdog Timer1
RTC – Real Time Counter2
EIC – External Interrupt Controller3
FREQM - Frequency Meter4
USB - Universal Serial Bus5
NVMCTRL – Non-Volatile Memory Controller6
DMAC - Direct Memory Access Controller7
EVSYS – Event System8
SERCOM0 – Serial Communication Interface 09
SERCOM1 – Serial Communication Interface 110
SERCOM2 – Serial Communication Interface 211
SERCOM3 – Serial Communication Interface 312
SERCOM4 – Serial Communication Interface 413
SERCOM5 – Serial Communication Interface 514
TCC0 – Timer Counter for Control 015
TC0 – Timer Counter 016
TC1 – Timer Counter 117
TC2 – Timer Counter 218
TC3 – Timer Counter 319
ADC – Analog-to-Digital Converter20
AC – Analog Comparator21
PTC – Peripheral Touch Controller22
SLCD - Segmented LCD Controller23
AES - Advanced Encryption Standard module24
TRNG - True Random Number Generator25