Datasheet

133
XMEGA B [DATASHEET]
8291B–AVR–01/2013
Table 12-1. Synchronous sense support.
Table 12-2. Full asynchronous sense support.
Table 12-3. Limited asynchronous sense support.
12.7 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 12-4. 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 Rising edge Pin value
Falling edge Falling edge Pin value
Both edge Any edge Pin value
Low level Pin value Pin value