ATXMEGA32D4-CU データシートの表示（PDF） - Atmel Corporation
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ATXMEGA32D4-CU Datasheet PDF : 136 Pages
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XMEGA D4
8. Event System
8.1 Features
8.2 Overview
• System for direct peripheral-to-peripheral communication and signaling
• Peripherals can directly send, receive, and react to peripheral events
– CPU independent operation
– 100% predictable signal timing
– Short and guaranteed response time
• 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
– Quadrature decoders
– Digital filtering of I/O pin state
• Works in active mode and idle sleep mode
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 shows a basic diagram of all connected peripherals. The event system
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.
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8135L–AVR–06/12
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