SAM4L Datasheet, PDF (177/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
12.7.9 32 KHz RC Oscillator Control Register
Name:
Access Type:
Reset Value:
RC32KCR
Read/Write
0x00000000
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
-
15
14
13
12
11
10
9
8
-
-
-
-
-
-
-
-
7
6
5
4
3
2
1
0
FCD
-
REF
MODE
EN1K
EN32K
TCEN
EN
• FCD: Flash calibration done
Signifies that COARSE in the RC32KCALIB register has been loaded with value from fuses.
0: Fuses not loaded. CALIB will be loaded on reset.
1: Fuses loaded. CALIB will keep its current value on reset.
• REF: Reference select
Selects the reference clock for the Closed Loop mode.
0: The OSC32K is selected as the reference.
1: Generic clock is selected for reference. See module configuration for the generic clock configuration.
• MODE: Mode Selection
0: RC32K operates in Open Loop mode.
1: RC32K operates in Closed Loop mode.
• EN1K: Enable 1 kHz output
0: 1 kHz output is disabled.
1: 1 kHz output is enabled.
• EN32K: Enable 32 KHz output
0: 32 kHz output is disabled.
1: 32 kHz output is enabled.
• TCEN: Temperature Compensation Enable
0: The oscillator is not temperature compensated.
1: The oscillator is temperature compensated.
• EN: Enable as Generic clock source
0: The oscillator is not enabled as a Generic clock source.
1: The oscillator is enabled as a Generic clock source.
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 12.7.7 ”Unlock Register” on page 173 for details.
42023C–SAM–02/2013
177