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Chapter 17 Clock Modulator
2.Clock Modulator Registers
● Clock Modulator Control Register (CMCR)
The Control Register (CMCR) has the following functions:
Set the modulator to power down mode
Modulator enable/disable in frequency modulation mode
Indicates the status of the modulator
Figure 2-2 Configuration of the clock modulator control register (CMCR)
The bits FMODRUN, FMOD, PDX control or indicate the status of the frequency modulation mode. Frequency
modulation mode needs some additional configuration (CMPR register).
bit 0
PDX Power down bit
0 power down mode
1 power up
bit 1
FMOD Frequency modulation enable bit
0 Frequency modulation mode disabled
1 Frequency modulation mode enabled
bit 3
FMOD
RUN
Modulator status in frequency modulation mode
0 Clock frequency unmodulated
1 Clock frequency modulated
R/W : Readable and writable
R : Read only
X : Undefined value
- : Undefined
: Initial value
10325476
Initial value
X 0 0 1 0 X 0 0
B
H
0004BB
CMCR
Re-
served
Re-
served
Re-
served
-
FMOD
FMOD
PDX
RUN
R/W R/W R/W
R
-
R/W R/W
bit 4,5,6
Reserved
bit 4 Always write 1 to this bit
Always write 0 to this bit
bit 5,6
-
-