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ATSAM4S-XPLD
478
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
28.2.16.7PMC Clock Generator Main Oscillator Register
Name:
CKGR_MOR
Address:
0x400E0420
Access:
Read-write
This register can only be written if the WPEN bit is cleared in
.
• MOSCXTEN: Main Crystal Oscillator Enable
A crystal must be connected between XIN and XOUT.
0 = The Main Crystal Oscillator is disabled.
1 = The Main Crystal Oscillator is enabled. MOSCXTBY must be set to 0.
When MOSCXTEN is set, the MOSCXTS flag is set once the Main Crystal Oscillator start-up time is achieved.
• MOSCXTBY: Main Crystal Oscillator Bypass
0 = No effect.
1 = The Main Crystal Oscillator is bypassed. MOSCXTEN must be set to 0. An external clock must be connected on XIN.
When MOSCXTBY is set, the MOSCXTS flag in PMC_SR is automatically set.
Clearing MOSCXTEN and MOSCXTBY bits allows resetting the MOSCXTS flag.
• WAITMODE: Wait Mode Command
0 = No effect.
1 = Enters the device in Wait Mode.
Note:
The WAITMODE bit is write-only.
• MOSCRCEN: Main On-Chip RC Oscillator Enable
0 = The Main On-Chip RC Oscillator is disabled.
1 = The Main On-Chip RC Oscillator is enabled.
When MOSCRCEN is set, the MOSCRCS flag is set once the Main On-Chip RC Oscillator start-up time is achieved.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
CFDEN
MOSCSEL
23
22
21
20
19
18
17
16
KEY
15
14
13
12
11
10
9
8
MOSCXTST
7
6
5
4
3
2
1
0
–
MOSCRCF
MOSCRCEN
WAITMODE
MOSCXTBY
MOSCXTEN