Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet
Product codes
ATSAM4L-XSTK
460
42023E–SAM–07/2013
ATSAM4L8/L4/L2
19.6.1
Control Register
Name: CR
Access Type:
Read/Write
Offset:
0x00
Reset Value:
0x00000000
When the SR.BUSY bit is set, writes to this register will be discarded and this register will read as zero.
• PSEL: Prescaler Select
Selects prescaler bit PSEL as source clock for the counter.
• CAn: Clear on Alarm n
0: The corresponding alarm will not clear the counter.
1: The corresponding alarm will clear the counter.
• CAL: Calendar Mode
0: The AST operates in counter mode.
1: The AST operates in calendar mode.
• PCLR: Prescaler Clear
Writing a zero to this bit has no effect.
Writing a one to this bit clears the prescaler.
This bit always reads as zero.
• EN: Enable
0: The AST is disabled.
1: The AST is enabled.
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
PSEL
15
14
13
12
11
10
9
8
-
-
-
-
-
-
CA1
CA0
7
6
5
4
3
2
1
0
-
-
-
-
-
CAL
PCLR
EN