Data Sheet

109
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
After a user reset, the reset value of the CLKCTRL register versus module instance is as shown in Table 14-6.
Table 14-6. CLKCTRL Reset Value after a User Reset
Module Instance Reset Value after a User Reset
CLKCTRL.GEN CLCTRL.CLKEN CLKCTRL.WRTLOCK
RTC
0x00 if WRTLOCK=0 and
CLKEN=0
No change if WRTLOCK=1
or CLKEN=1
0x00 if WRTLOCK=0 and CLKEN=0
No change if WRTLOCK=1 or CLKEN=1
No change
WDT
0x02 if WRTLOCK=0
No change if WRTLOCK=1
If WRTLOCK=0
0x01 if WDT Enable bit in NVM User
Row written to one
0x00 if WDT Enable bit in NVM User
Row written to zero
If WRTLOCK=1 no change
No change
Others
0x00 if WRTLOCK=0
No change if WRTLOCK=1
0x00 if WRTLOCK=0
No change if WRTLOCK=1
No change