Datasheet

Each interrupt source has an associated Interrupt flag. The interrupt flag in the Interrupt Flag Status and
Clear register (INTFLAG) is set when an Interrupt condition occurs (NMIFLAG for NMI). Each interrupt,
except NMI, can be individually enabled by setting the corresponding bit in the Interrupt Enable Set
register (INTENSET=1), and disabled by setting the corresponding bit in the Interrupt Enable Clear
register (INTENCLR=1).
An interrupt request is generated when the interrupt flag is set and the corresponding interrupt is enabled.
The interrupt request remains active until the interrupt flag is cleared, the interrupt is disabled, or the EIC
is reset. See the INTFLAG register for details on how to clear Interrupt flags. The EIC has one interrupt
request line for each external interrupt (EXTINTx) and one line for NMI. The user must read the INTFLAG
(or NMIFLAG) register to determine which Interrupt condition is present.
Note:
1. Interrupts must be globally enabled for interrupt requests to be generated.
2. If an external interrupts (EXTINT) is common on two or more I/O pins, only one will be active (the
first one programmed).
Related Links
10. Processor and Architecture
23.6.7 Events
The EIC can generate the following output events:
• External event from pin (EXTINTx).
Setting an Event Output Control register (EVCTRL.EXTINTEO) enables the corresponding output event.
Clearing this bit disables the corresponding output event. Refer to Event System for details on configuring
the Event System.
When the condition on pin EXTINTx matches the configuration in the CONFIGn register, the
corresponding event is generated, if enabled.
Related Links
31. EVSYS – Event System
23.6.8 Sleep Mode Operation
In sleep modes, an EXTINTx pin can wake up the device if the corresponding condition matches the
configuration in the CONFIG register, and the corresponding bit in the Interrupt Enable Set register
(23.8.7 INTENSET) is written to '1'.
Figure 23-5. Wake-up Operation Example (High-Level Detection, No Filter, Interrupt Enable Set)
CLK_EIC_APB
EXTINTx
intwake_extint[x]
intreq_extint[x]
clear INTFLAG.EXTINT[x]
wake from sleep mode
Related Links
23.8.10 CONFIG
SAM D5x/E5x Family Data Sheet
EIC – External Interrupt Controller
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 459