Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002058A-page 39
ATxmega128A1U/ATxmega64A1U
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 39.
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 Alternate Port Functions
Most port pins have alternate pin functions in addition to being a general purpose I/O pin. When an alternate function is
enabled, it might override the normal port pin function or pin value. This happens when other peripherals that require pins
are enabled or configured to use pins. If and how a peripheral will override and use pins is described in the section for that
peripheral. “Pinout and Pin Functions” on page 63 shows which modules on peripherals that enable alternate functions on
a pin, and what alternate functions that are available on a pin.
D
Q
R
INVERTED I/O
Interrupt
Control
D
Q
R
Pxn
Synchronizer
INn
EDGE
DETECT
Synchronous sensing
EDGE
DETECT
Asynchronous sensing
IRQ
Synchronous
Events
Asynchronous
Events