Datasheet

 2017 Microchip Technology Inc. DS60001516A-page 283
SAM9G20
25.9.7 PMC Clock Generator Main Oscillator Register
Name:CKGR_MOR
Access:Read/Write
MOSCEN: Main Oscillator Enable
A crystal must be connected between XIN and XOUT.
0: The Main Oscillator is disabled.
1: The Main Oscillator is enabled. OSCBYPASS must be set to 0.
When MOSCEN is set, the MOSCS flag is set once the Main Oscillator startup time is achieved.
OSCBYPASS: Oscillator Bypass
0: No effect.
1: The Main Oscillator is bypassed. MOSCEN must be set to 0. An external clock must be connected on XIN.
When OSCBYPASS is set, the MOSCS flag in PMC_SR is automatically set.
Clearing MOSCEN and OSCBYPASS bits allows resetting the MOSCS flag.
OSCOUNT: Main Oscillator Start-up Time
Specifies the number of Slow Clock cycles multiplied by 8 for the Main Oscillator start-up time.
31 30 29 28 27 26 25 24
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23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
OSCOUNT
76543210
––––––OSCBYPASSMOSCEN