SAM4L Datasheet, PDF (466/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

19.6.13 Clock Control Register
Name:
CLOCK
Access Type:
Read/Write
Offset:
0x40
Reset Value:
0x00000000
31
30
29
28
27
26
-
-
-
-
-
-
23
22
21
20
19
18
-
-
-
-
-
-
15
14
13
12
11
10
-
-
-
-
-
7
6
5
4
3
2
-
-
-
-
-
-
When writing to this register, follow the sequence in Section 19.5.1 on page 447.
• CSSEL: Clock Source Selection
This field defines the clock source CLK_AST_PRSC for the prescaler:
Table 19-2.
CSSEL
0
1
2
3
4
Clock Source Selection
Clock Source
System RC oscillator (RCSYS)
32kHz oscillator (OSC32 or RC32)
APB clock
Generic clock (GCLK)
1kHz clock from 32kHz oscillator or 32kHz
RC oscillator (CLK_1K)
• CEN: Clock Enable
0: CLK_AST_PRSC is disabled.
1: CLK_AST_PRSC is enabled.
ATSAM4L4/L2
25
-
17
-
9
CSSEL
1
-
24
-
16
-
8
0
CEN
42023C–SAM–02/2013
466