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Chapter 6 Clock Description
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
119
6.7.5.2
Modulation Register (MR)
Offset: 0x4
Access: Supervisor read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
STRB_BYP
A
S
S
0
SPRD_SEL
MOD_PERIOD
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
FM_EN
INC_STEP
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-8. Modulation Register (MR)
Table 6-13. MR field descriptions
Field
Description
STRB_BYPASS Strobe bypass.
The STRB_BYPASS signal is used to bypass the strobe signal used inside FMPLL to latch the
correct values for control bits (INC_STEP, MOD_PERIOD, and SPRD_SEL).
0 Strobe is used to latch FMPLL modulation control bits
1 Strobe is bypassed. In this case control bits need to be static. The control bits must be changed
only when FMPLL is in powerdown mode.
SPRD_SEL
Spread type selection.
The SPRD_SEL controls the spread type in Frequency Modulation mode.
0 Center SPREAD
1 Down SPREAD
MOD_PERIOD Modulation period.
The MOD_PERIOD field is the binary equivalent of the value modperiod derived from following
formula:
where:
f
ref
:
represents the frequency of the feedback divider
f
mod
: represents the modulation frequency
modperiod
f
ref
4
f
mod
--------------------
=
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