25.6.4 Interrupts

The SUPC has the following interrupt sources, which are either synchronous or asynchronous wake-up sources:

  • VDDCORE Voltage Ready (VCORERDY), asynchronous
  • Voltage Regulator Ready (VREGRDY) asynchronous
  • BOD33 Ready (BOD33RDY), synchronous
  • BOD33 Detection (BOD33DET), asynchronous
  • BOD33 Synchronization Ready (B33SRDY), synchronous
  • DFLLULP Low-Power Voltage Reference Ready (ULPVREFRDY), asynchronous

Each interrupt source has an interrupt flag associated with it. The interrupt flag in the Interrupt Flag Status and Clear register (INTFLAG) is set when the interrupt condition occurs.

Each interrupt can be individually enabled by writing a '1' to the corresponding bit in the Interrupt Enable Set register (INTENSET), and disabled by writing a '1' to the corresponding bit in the Interrupt Enable Clear register (INTENCLR).

An interrupt request is generated when the interrupt flag is set and the corresponding interrupt is enabled. The interrupt request remains active until either the interrupt flag is cleared, the interrupt is disabled, or the SUPC is reset. See the INTFLAG register for details on how to clear interrupt flags. The SUPC has one common interrupt request line for all the interrupt sources. The user must read the INTFLAG register to determine which interrupt condition is present.

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