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6.4
Application Note of the Clock Modulator
Startup/stop sequence for phase modulation mode.
Startup/stop sequence for frequency modulation mode.
Modulation parameter for frequency modulation mode.
■ Recommended Startup Sequence for Phase Modulation Mode
start
stop
Note:
Do not enable the modulator before the PLL lock time has elapsed. Do not disable the PLL while the
modulator is running.
■ Recommended Startup Sequence for Frequency Modulation Mode
start
stop
1.
Switch ON PLL
2.
Wait PLL lock time (refer to the MCM flag description in the CLOCK chapter
of the hardware manual).
3.
Enable phase modulation mode (PMOD=1).
The clock switches immediately to modulated clock
... running...
4.
Disable modulator PMOD=0
5.
4 NOP cycles
6.
Disable PLL, switch to power down mode, etc.
1.
Switch modulator from power down to power up mode PDX=1
2.
Switch ON PLL
3.
Wait PLL lock time (refer to the MCM flag description in the CLOCK chapter
of the hardware manual). At the same time the modulator starts up.
4.
Set CMPR register to a proper setting
5.
Enable frequency modulation mode FMOD=1
After the calibration is finished, the clock switches from unmodulated to
modulated clock and the FMODRUN flag changes to "1"
... running...
6.
Disable modulator FMOD=0
7.
Wait until FMODRUN changes to "0"
8.
Switch to power down mode PDX=0
9.
Disable PLL, switch to power down mode, etc.
CHAPTER 6 CLOCK MODULATOR
121
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