Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002059A-page 24
ATxmega32E5/16E5/8E5
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 periph-
eral’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 exe-
cution 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.