Data Sheet

407
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
23.3 Block Diagram
Figure 23-1. Event System Block Diagram
23.4 Signal Description
Not applicable.
23.5 Product Dependencies
In order to use this peripheral, other parts of the system must be configured correctly, as described below.
23.5.1 I/O Lines
Not applicable.
23.5.2 Power Management
The EVSYS can be used to wake up the CPU from all sleep modes, even if the clock used by the EVSYS channel and
the EVSYS bus clock are disabled. Refer to “PM – Power Manager” on page 117 for details on the different sleep modes.
In all sleep modes where the clock for the EVSYS is stopped, the device can wake up the EVSYS clock.
23.5.3 Clocks
The EVSYS bus clock (CLK_EVSYS_APB) can be enabled and disabled in the Power Manager, and the default state of
CLK_EVSYS_APB can be found in the Peripheral Clock Masking section in “PM – Power Manager” on page 117.
Each EVSYS channel has a dedicated generic clock (GCLK_EVSYS_CHANNELx). These are used for detection and
propagation of events for each channel. These clocks must be configured and enabled in the generic clock controller
before using the EVSYS. Refer to “Enabling a Generic Clock” on page 99 for details.
23.5.4 DMA
Not applicable.
PERIPHERALS
EVSYS
USER
MUX
PERIPHERALS
GCLK
GENERATOR
EVENTS
CLOCK REQUESTS
USERS EVENTS
EVENT
CHANNELS