Datasheet

Value Description
0
The oscillator is disabled in standby sleep mode.
1
The oscillator is not stopped in standby sleep mode. If XOSC.ONDEMAND is one, the clock
source will be running when a peripheral is requesting the clock. If XOSC.ONDEMAND is
zero, the clock source will always be running in standby sleep mode.
Bit 2 – XTALEN Crystal Oscillator Enable
This bit controls the connections between the I/O pads and the external clock or crystal oscillator:
Value Description
0
External clock connected on XIN. XOUT can be used as general-purpose I/O.
1
Crystal connected to XIN/XOUT.
Bit 1 – ENABLE Oscillator Enable
Value Description
0
The oscillator is disabled.
1
The oscillator is enabled.
SAM D21 Family
SYSCTRL – System Controller
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 212