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XMEGA E5 [DATASHEET]

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

10.

Event System

10.1

Features

System for direct peripheral-to-peripheral communication and signaling

Peripherals can directly send, receive, and react to peripheral events

CPU and EDMA controller independent operation

100% predictable signal timing

Short and guaranteed response time

Synchronous and asynchronous event routing

Eight event channels for up to eight different and parallel signal routing and configurations

Events can be sent and/or used by most peripherals, clock system, and software

Additional functions include

Quadrature decoder with rotary filtering

Digital filtering of I/O pin state with configurable filter

Simultaneous synchronous and asynchronous events provided to peripheral

Works in all sleep modes

10.2

Overview

The event system enables direct peripheral-to-peripheral communication and signaling. It allows a change in one

peripheral’s state to automatically trigger actions in other peripherals. It is designed to provide a predictable system for

short and predictable response times between peripherals. It allows for autonomous peripheral control and interaction

without the use of interrupts, CPU, or EDMA controller resources, and is thus a powerful tool for reducing the complexity,

size and execution time of application code. It allows for synchronized timing of actions in several peripheral modules.

The event system enables also asynchronous event routing for instant actions in peripherals.

A change in a peripheral’s state is referred to as an event, and usually corresponds to the peripheral’s interrupt

conditions. Events can be directly passed to other peripherals using a dedicated routing network called the event routing

network. How events are routed and used by the peripherals is configured in software.

Figure 10-1 shows a basic diagram of all connected peripherals. The event system can directly connect together analog

and digital converters, analog comparators, I/O port pins, the real-time counter, timer/counters, IR communication

module (IRCOM) and XMEGA Custom Logic (programmable logic) block (XCL). It can also be used to trigger EDMA

transactions (EDMA controller). Events can also be generated from software and peripheral clock.

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