ATXMEGA32D4-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA32D4-CU

8/16-bit Atmel XMEGA D4 Microcontroller

Atmel Corporation 

XMEGA D4

14.4 Input sensing

Input sensing is synchronous or asynchronous depending on the enabled clock for the ports,

and the configuration is shown in Figure 14-7.

Figure 14-7. Input sensing system overview.

Asynchronous sensing

EDGE

DETECT

Interrupt

Control

IREQ

Pn

INVERTED I/O

Synchronizer

INn

D QD Q

RR

Synchronous sensing

EDGE

DETECT

Event

When a pin is configured with inverted I/O, the pin value is inverted before the input sensing.

14.5 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 51 shows which modules on peripherals that enable alternate func-

tions on a pin, and which alternate functions that are available on a pin.

33

8135L–AVR–06/12

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