Datasheet

35
[Not recommended for new designs - Use XMEGA A1U series] XMEGA A1 [DATASHEET]
8067O–AVR–06/2013
15.4 Input sensing
Input sensing is synchronous or asynchronous depending on the enabled clock for the ports, and the configuration is
shown in Figure 15-7 on page 35.
Figure 15-7. Input sensing system overview
When a pin is configured with inverted I/O the pin value is inverted before the input sensing.
15.5 Port Interrupt
Each ports have two interrupts with seperate priority and interrupt vector. All pins on the port can be individually selected
as source for each of the interrupts. The interrupts are then triggered according to the input sense configuration for each
pin configured as source for the interrupt.
15.6 Alternate Port Functions
In addition to the input/output functions on all port pins, most pins have alternate functions. This means that other
modules or peripherals connected to the port can use the port pins for their functions, such as communication or pulse-
width modulation. “Pinout and Pin Functions” on page 55 shows which modules on peripherals that enables alternate
functions on a pin, and what alternate functions that is available on a pin.
INVERTED I/O
Interrupt
Control
IREQ
Event
Pn
D
Q
R
D
Q
R
Synchronizer
INn
EDGE
DETECT
Asynchronous sensing
Synchronous sensing
EDGE
DETECT