Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet
Product codes
ATSAM4L-XSTK
236
42023E–SAM–07/2013
ATSAM4L8/L4/L2
13.7.14
DFLLx Spread Spectrum Generator Control Register
Name:
DFLLxSSG
Access Type:
Read/Write
Reset Value:
0x00000000
• STEPSIZE: SSG Step Size
Selects the step size of the spread spectrum. If zero or one, the value added to the FINE bits will be incremented/decremented
with one on every positive edge of the input clock. If n > 1, the value added to the FINE bits will be incremented/decremented
with n on every positive edge of the input clock.
• AMPLITUDE: SSG Amplitude
Selects the amplitude of the spread spectrum. If zero, only the LSB of the FINE bits will be affected. If one, the sequence {1, 0,
-1, 0} will be added to FINE bits, etc.
• PRBS: Pseudo Random Bit Sequence
0: Each spread spectrum frequency is applied at constant intervals
1: Each spread spectrum frequency is applied at pseudo-random intervals
• EN: Enable
0: SSG is disabled.
1: SSG is enabled.
Note that this register is protected by a lock. To write to this register the UNLOCK register has to be written first. Refer to
for details.
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
STEPSIZE
15
14
13
12
11
10
9
8
-
-
-
AMPLITUDE
7
6
5
4
3
2
1
0
-
-
-
-
-
-
PRBS
EN