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CHAPTER 6 CLOCK MODULATOR
6.3.2
Clock Modulation Parameter Register (CMPR)
The Modulation Parameter Register (CMPR) determines the modulation degree in
frequency modulation mode.
■ Modulation Parameter Register
: Readable and writable
R/W
:
Undefined value
X
: Undefined
• The modulation parameter determines the degree of modulation and the maximal and minimal occurring
frequencies in the modulated clock. Please refer to the application note for a description of an approach
to select the optimal setting.
• Each set of possible modulation parameters refers to a particular PLL frequency. The PLL frequency
and the selected parameter must match. Please refer to Table 6.3-3.
• The modulation parameter affects only the frequency modulation mode. Phase modulation mode has a
fixed setting which cannot be changed.
Note:
The modulation parameter must be changed only when the modulator is disabled and the RUN flag
is "0" (FMOD=0, FMODRUN=0).
114
Figure 6.3-3 Modulation Parameter Register
7
6
5
bit
Address:
MP7 MP6 MP5 MP4 MP3 MP2 MP1 MP0
0035C0 H
R/W R/W R/W R/W
bit
15
14
13
12
0035C1 H
MP13 MP12 MP11 MP10 MP9 MP8
R/W R/W
4
3
2
1
0
R/W
R/W
R/W R/W
11
10
9
8
R/W
R/W
R/W R/W
CMPRL (lower)
Initial value
1 1 1 1 1 1 0 1
B
CMPRH (upper)
Initial value
X X 0 0 0 0 1 0
B
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