15.10 Interrupt-on-Change
An input change on any port pins that support IOC sets Flag bit,
IOCIF. The interrupt can be enabled/disabled by setting/clearing the
enable bit, IOCIE. Pins must also be individually enabled in the
IOCxP and IOCxN register. IOCIF is a read-only bit and the flag can be cleared by clearing the
corresponding IOCxF registers. For more information, refer to chapter
“Interrupt-on-Change”.