Datasheet

To configure a user multiplexer, the USER register must be written in a single 16-bit write. It is possible to

read out the configuration of a user by first selecting the user by writing to USER.USER using an 8-bit

write and then performing a read of the 16-bit USER register.

Figure 24-2. User MUX

USER

MUX

PERIPHERAL A PERIPHERAL B

USER.CHANNEL

USER_EVT_x

USER_EVT_y

USER_EVT_z

CHANNEL_EVT_0

CHANNEL_EVT_1

CHANNEL_EVT_m

24.6.2.4 Channel Setup

An event channel can select one event from a list of event generators. Depending on configuration, the

selected event could be synchronized, resynchronized or asynchronously sent to the users. When

synchronization or resynchronization is required, the channel includes an internal edge detector, allowing

the Event System to generate internal events when rising, falling or both edges are detected on the

selected event generator. An event channel is able to generate internal events for the specific software

commands. All these configurations are available in the Channel register (CHANNEL).

To configure a channel, the Channel register must be written in a single 32-bit write. It is possible to read

out the configuration of a channel by first selecting the channel by writing to CHANNEL.CHANNEL using

a, 8-bit write, and then performing a read of the CHANNEL register.

24.6.2.5 Channel Path

There are three different ways to propagate the event provided by an event generator:

• Asynchronous path

• Synchronous path

• Resynchronized path

SAM D21 Family

EVSYS – Event System

Datasheet Complete

DS40001882D-page 440