ATXMEGA8E5_14 datasheet(30/147 Pages) ATMEL

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XMEGA E5 [DATASHEET]

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

16.

I/O Ports

16.1

Features

26 general purpose input and output pins with individual configuration

Output driver with configurable driver and pull settings:

Totem-pole

Wired-AND

Wired-OR

Bus-keeper

Inverted I/O

Input with asynchronous sensing with interrupts and events

Sense both edges

Sense rising edges

Sense falling edges

Sense low level

Optional pull-up and pull-down resistor on input and Wired-OR/AND configurations

Optional slew rate control per I/O port

Asynchronous pin change sensing that can wake the device from all sleep modes

One port interrupt with pin masking per I/O port

Efficient and safe access to port pins

Hardware read-modify-write through dedicated toggle/clear/set registers

Configuration of multiple pins in a single operation

Mapping of port registers into bit-accessible I/O memory space

Peripheral clocks output on port pin

Real-time counter clock output to port pin

Event channels can be output on port pin

Remapping of digital peripheral pin functions

Selectable USART and timer/counters input/output pin locations

Selectable Analog Comparator output pin locations

16.2

Overview

One port consists of up to 8 pins ranging from pin 0 to 7. Each port pin can be configured as input or output with

configurable driver and pull settings. They also implement asynchronous input sensing with interrupt and events for

selectable pin change conditions.

Asynchronous pin-change sensing means that a pin change can wake the device from all sleep modes, including the

modes where no clocks are running.

All functions are individual and configurable per pin, but several pins can be configured in a single operation. The pins

have hardware read-modify-write (RMW) functionality for safe and correct change of drive value and/or pull resistor

configuration. The direction of one port pin can be changed without unintentionally changing the direction of any other

pin.

The port pin configuration also controls input and output selection of other device functions. It is possible to have both the

peripheral clock and the real-time clock output to a port pin, and available for external use. The same applies to events

from the event system that can be used to synchronize and control external functions. Other digital peripherals, such as

USART, timer/counters, and analog comparator output can be remapped to selectable pin locations in order to optimize

pin-out versus application needs.

The notations of the ports are PORTA, PORTC, PORTD, and PORTR.

ATXMEGA8E5 Datasheet(PDF) 30 Page - ATMEL Corporation

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