15.2 Overview

The Event System (EVSYS) enables direct peripheral-to-peripheral signaling. It allows a change in one peripheral (the event generator) to trigger actions in other peripherals (the event users) through event channels, without using the CPU. It is designed to provide a short and predictable response time between peripherals, allowing for autonomous peripheral control and interaction, and for synchronized timing of actions in several peripheral modules. Thus, the EVSYS peripheral makes it possible to implement Core Independent Peripherals (CIPs). Also, it is a powerful tool for reducing the complexity, size, and execution time of the software.

A change of the event generator’s state is referred to as an event and usually corresponds to one of the peripheral’s interrupt conditions. Events can be forwarded directly to other peripherals using the dedicated event routing network. The routing of each channel is configured in software, including event generation and use.

Only one event signal can be routed on each channel. Multiple peripherals can use events from the same channel.

The EVSYS can connect peripherals such as ADCs, analog comparators, I/O PORT pins, the real-time counter, timer/counters, and the configurable custom logic peripheral. Events can also be generated from software.