Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet
Product codes
ATSAM4L-XSTK
472
42023E–SAM–07/2013
ATSAM4L8/L4/L2
19.6.13
Clock Control Register
Name: CLOCK
Access Type:
Read/Write
Offset:
0x40
Reset Value:
0x00000000
When writing to this register, follow the sequence in
• CSSEL: Clock Source Selection
This field defines the clock source CLK_AST_PRSC for the prescaler:
• CEN: Clock Enable
0: CLK_AST_PRSC is disabled.
1: CLK_AST_PRSC is enabled.
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
-
15
14
13
12
11
10
9
8
-
-
-
-
-
CSSEL
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
CEN
Table 19-2.
Clock Source Selection
CSSEL
Clock Source
0
System RC oscillator (RCSYS)
1
32kHz oscillator (OSC32 or RC32)
2
APB clock
3
Generic clock (GCLK)
4
1kHz clock from 32kHz oscillator or 32kHz
RC oscillator (CLK_1K)