18.3.3 Interrupts

Table 18-3. Available Interrupt Vectors and Sources
Name Vector Description Conditions
PORTx PORT interrupt INTn in PORTx.INTFLAGS is raised as configured by the Input/Sense Configuration (ISC) bit in PORTx.PINnCTRL

Each PORT pin n can be configured as an interrupt source. Each interrupt can be individually enabled or disabled by writing to ISC in PORTx.PINnCTRL.

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

An interrupt request is generated when the corresponding interrupt source 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.

When setting or changing interrupt settings, consider these points:
  • If an Inverted I/O Enable (INVEN) bit is toggled in the same cycle as ISC is changed, the edge caused by the inversion toggling may not cause an interrupt request
  • Changing INLVL for a pin must be performed while relevant interrupts and peripheral modules are disabled. Changing the threshold while a module is active may generate a temporary state transition on the input, regardless of the actual voltage level on that pin.
  • If disabling an input by writing to ISC while synchronizing an interrupt, that specific interrupt may be requested on re-enabling the input, even if it is re-enabled with a different interrupt setting
  • If the interrupt setting is changed by writing to ISC while synchronizing an interrupt, that interrupt may not be requested