SAM4L Datasheet, PDF (223/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
13.7.8 Oscillator Control Register
Name:
Access Type:
Reset Value:
OSCCTRLn
Read/Write
0x00000000
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
OSCEN
15
14
13
12
11
10
9
8
-
-
-
-
STARTUP[3:0]
7
6
5
4
3
2
1
0
-
-
-
AGC
GAIN[1:0]
MODE
• OSCEN: Oscillator Enable
0: The oscillator is disabled.
1: The oscillator is enabled.
• STARTUP: Oscillator Start-up Time
Select start-up time for the oscillator. Refer to the “Oscillator Startup Time” table in the SCIF Module Configuration section for
details.
• AGC: Automatic Gain Control
For test purposes.
• GAIN: Gain
Selects the gain for the oscillator. Refer to the “Oscillator Gain Settings” table in the SCIF Module Configuration section for
details.
• MODE: Oscillator Mode
0: External clock connected on XIN. XOUT can be used as general-purpose I/O (no crystal).
1: Crystal is connected to XIN/XOUT.
Note that this register is protected by a lock. To write to this register the UNLOCK register has to be written first. Refer to
Section 13.7.7 ”Unlock Register” on page 222 for details.
42023C–SAM–02/2013
223