Data Sheet

421
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
23.8.3 User Multiplexer
This register is used to configure a specified event user. To write to this register, do a single 16-bit write of all the
configuration and event user selection data.
To read from this register, first do an 8-bit write to the USER.USER bit group specifying the event user configuration to be
read, and then read USER.
Name: USER
Offset: 0x08
Reset: 0x0000
Property: Write-Protected
z Bits 15:13 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
z Bits 12:8 – CHANNEL[4:0]: Channel Event Selection
These bits are used to select the channel to connect to the event user.
Note that to select channel n, the value (n+1) must be written to the USER.CHANNEL bit group.
Table 23-5. Channel Event Selection
z Bits 7:5 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
z Bits 4:0 – USER[4:0]: User Multiplexer Selection
These bits select the event user to be configured with a channel, or the event user to read the channel value from.
Bit 151413121110 9 8
CHANNEL[4:0]
Access R R R R/W R/W R/W R/W R/W
Reset00000000
Bit 76543210
USER[4:0]
Access R R R R/W R/W R/W R/W R/W
Reset00000000
CHANNEL[4:0] Channel Number
0x0 No Channel Output Selected
0x1-0xC Channel n-1 selected
0xD-0xFF Reserved