Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
403
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
23.8.1 Control
Name:
CTRL
Offset:
0x00
Reset:
0x00
Property:
Write-Protected
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.
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
Bit 4 – GCLKREQ: Generic Clock Requests
This bit is used to determine whether the generic clocks used for the different channels should be on all the time or
only when an event needs the generic clock. Events propagated through asynchronous paths will not need a
generic clock.
0: Generic clock is requested and turned on only if an event is detected.
1: Generic clock for a channel is always on.
This bit is used to determine whether the generic clocks used for the different channels should be on all the time or
only when an event needs the generic clock. Events propagated through asynchronous paths will not need a
generic clock.
0: Generic clock is requested and turned on only if an event is detected.
1: Generic clock for a channel is always on.
z
Bits 3:1 – 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.
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
Bit 0 – SWRST: Software Reset
Writing a zero to this bit has no effect.
Writing a one to this bit resets all registers in the EVSYS to their initial state.
Writing a one to CTRL.SWRST will always take precedence, meaning that all other writes in the same write-oper-
ation will be discarded.
Writing a zero to this bit has no effect.
Writing a one to this bit resets all registers in the EVSYS to their initial state.
Writing a one to CTRL.SWRST will always take precedence, meaning that all other writes in the same write-oper-
ation will be discarded.
Bit
7
6
5
4
3
2
1
0
GCLKREQ
SWRST
Access
R
R
R
R/W
R
R
R
W
Reset
0
0
0
0
0
0
0
0