Clock modulation parameter register (cmpr), Modulation parameter register contents – FUJITSU MB91460 SERIES FR60 User Manual
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Chapter 17 Clock Modulator
2.Clock Modulator Registers
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Clock Modulation Parameter Register (CMPR)
The Modulation Parameter Register (CMPR) determines the modulation degree in frequency modulation
mode.
Figure 2-3 Modulation parameter register
•
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 the following table of possible settings.
•
The modulation parameter affects only the frequency modulation mode.
Note:
The modulation parameter must be changed only when the modulator is disabled and the RUN flag is 0
(FMOD=0, FMODRUN=0).
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Modulation parameter register contents
modulator enabled in frequency modulation mode,
modulator is calibrating, modulation not active
1
1
0
modulator is running in frequency modulation mode
modulation is active
1
1
1
others not allowed
Table 2-3 Function of each bit of the modulation parameter register (CMPR)
Bit name
Function
bit 15, 14
Undefined
Table 2-2 States of the modulator
FMOD
PDX
FMODRUN
(read only)
Initial value
1 1 1 1 1 1 0 1
B
R/W R/W R/W R/W
R/W
R/W
R/W R/W
Address:
0004B9H
CMPRL (lower)
Initial value
X X 0 0 0 0 0 1 0
B
CMPRH (upper)
0004B8H
15
14
13
12
11
10
9
8
1
0
3
2
5
4
7
6
R/W R/W
R/W
R/W
R/W R/W
R/W
: Readable and writable
Undefined value
X
:
: Undefined