ATXMEGA8E5_14 datasheet(33/147 Pages) ATMEL

33 / 147 page

XMEGA E5 [DATASHEET]

Atmel-8153I–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–08/2014

16.4

Input sensing

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

shown in Figure 16-7.

Figure 16-7. Input sensing system overview.

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

16.5

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 58 shows which modules on peripherals that enable alternate

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

INVERTED I/O

Interrupt

Control

Pxn

Synchronizer

INn

EDGE

DETECT

Synchronous sensing

EDGE

DETECT

Asynchronous sensing

IRQ

Synchronous

Events

Asynchronous

Events

ATXMEGA8E5 Datasheet(PDF) 33 Page - ATMEL Corporation