ATxmega128D4-AU ATMEL [ATMEL Corporation], ATxmega128D4-AU Datasheet - Page 18

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ATxmega128D4-AU

Manufacturer Part Number
ATxmega128D4-AU
Description
8/16-bit Atmel XMEGA D4 Microcontroller
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet

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8. Event System
8.1
8.2
8135L–AVR–06/12
Features
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 inter-
rupts or CPU resources, and is thus a powerful tool for reducing the complexity, size and
execution time of application code. It also allows for synchronized timing of actions in several
peripheral modules.
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 ded-
icated routing network called the event routing network. How events are routed and used by the
peripherals is configured in software.
Figure 8-1 on page 19
can directly connect together analog to digital converter, analog comparators, I/O port pins, the
real-time counter, timer/counters, and IR communication module (IRCOM). Events can also be
generated from software and the peripheral clock.
System for direct peripheral-to-peripheral communication and signaling
Peripherals can directly send, receive, and react to peripheral events
Four event channels for up to four different and parallel signal routing configurations
Events can be sent and/or used by most peripherals, clock system, and software
Additional functions include
Works in active mode and idle sleep mode
– CPU independent operation
– 100% predictable signal timing
– Short and guaranteed response time
– Quadrature decoders
– Digital filtering of I/O pin state
shows a basic diagram of all connected peripherals. The event system
XMEGA D4
18

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