ATXMEGA128D4 datasheet(29/100 Pages) ATMEL

29 / 100 page

8135G–AVR–08/10

XMEGA D4

14.4

Input sensing

• Sense both edges

• Sense rising edges

• Sense falling edges

• Sense low level

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

and the configuration is shown in Figure 14-7 on page 29.

Figure 14-7. Input sensing system overview

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

14.5

Port Interrupt

Each port has two interrupts with separate 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.

14.6

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 46 shows which modules on peripherals that enable alternate functions on a pin, and

which alternate function is available on a pin.

INVERTED I/O

Interrupt

Control

IREQ

Event

Synchronizer

INn

EDGE

DETECT

Asynchronous sensing

Synchronous sensing

EDGE

DETECT

ATXMEGA128D4 Datasheet(PDF) 29 Page - ATMEL Corporation