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XMEGA A [MANUAL]
8077I–AVR–11/2012
must be kept until the end of the device wake-up time for an interrupt to be generated. If the low level disappears before
the end of the wake-up time, the device will still wake up, but no interrupt will be generated.
Table 13-1. Synchronous sense support.
Table 13-2. Full asynchronous sense support.
Table 13-3. Limited asynchronous sense support.
13.7
Port Event
Port pins can generate an event when there is a change on the pin. The sense configurations decide the conditions for
each pin to generate events. Event generation requires the presence of a peripheral clock, and asynchronous event
generation is not possible. For edge sensing, the changed pin value must be sampled once by the peripheral clock for an
event to be generated.
For level sensing, a low-level pin value will not generate events, and a high-level pin value will continuously generate
events. For events to be generated on a low level, the pin configuration must be set to inverted I/O.
Table 13-4. Event sense support.
Sense settings
Supported
Interrupt description
Rising edge
Yes
Always triggered
Falling edge
Yes
Always triggered
Any edge
Yes
Always triggered
Low level
Yes
Pin level must be kept unchanged during wake up
Sense settings
Supported
Interrupt description
Rising edge
Yes
Always triggered
Falling edge
Yes
Always triggered
Both edges
Yes
Always triggered
Low level
Yes
Pin level must be kept unchanged during wake up
Sense settings
Supported
Interrupt description
Rising edge
No
-
Falling edge
No
-
Any edge
Yes
Pin value must be kept unchanged during wake up
Low level
Yes
Pin level must be kept unchanged during wake up
Sense settings
Signal event
Data event
Rising edge
Pin value
Falling edge
Pin value
Both edge
Any edge
Pin value
Low level
Pin value
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