19.3.3 Interrupts

Table 19-7. Available Interrupt Vectors and Sources
Interrupt Vector Name	Interrupt Source Name	Description	Conditions
SLPCTRL	VOV	VMON overvoltage detected	VMON detects voltage level above high threshold
	VUV	VMON undervoltage detected	VMON detects voltage level below low threshold
	VDENTER	VMON has entered diagnostic (fault injection) mode	CTRLB.DMODE = ‘UNDER’ or CTRLB.DMODE = ‘OVER’
	VDEXIT	VMON has exited diagnostic (fault injection) mode	Diagnostic mode exited due to timeout or because CTRLB.DMODE = ‘NO’
	VERR	VMON has an internal error	VMON is in an illegal state
	VSLP	VMON is in sleep mode	The device has entered sleep mode and VMON thresholds are adjusted to sleep mode voltage levels. This flag will be permanently set when selecting OSC32K as main clock source.
	VDIS	VMON is disabled	Either of these: A hardware error has occurred erroneously disabling the VMON VREGCTRL.VMONSEN = ‘DISABLE’ and Standby or Power-Down sleep mode is entered
	SERR	Sleep error	SLEEP instruction was attempted with CTRLA.SEN = ‘`0`’ or CPU.SREG.I = ‘`0`’

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

An interrupt source is enabled or disabled by writing to the corresponding enable bit in the peripheral’s Interrupt Control (peripheral.INTCTRL) register.

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.