111
CHAPTER 6 CLOCK MODULATOR
bit2
FMOD RUN:
Modulator status
in frequency
modulation mode
bit
"0": MCU is running with unmodulated or phase modulated clock
"1": MCU is running with frequency modulated clock
•
FMODRUN indicates the status of the modulator output clock in frequency
modulation mode (FMOD=1). If the output clock is frequency modulated,
FMODRUN is set to "1", otherwise FMODRUN is set to "0".
•
FMODRUN does not indicate a phase modulated clock (PMOD=1). If the modulator
is enabled in phase modulation mode, FMODRUN is set to "0".
•
After enabling the frequency modulation mode by setting FMOD to "1", the
modulator is calibrated. During this time, the clock is unmodulated. Therefore it
takes several
μ
s before the output clock switches to modulated clock and the
FMODRUN bit is set to "1". The calibration time depends on the frequency of the
oscillator (refer to the table).
calibration time = 256/Fc
•
During normal operation, after calibration is finished, the clock is not switched to
unmodulated clock anymore.
•
Due to the synchronization of the FMOD signal and the synchronized switching to
unmodulated clock, it takes less than 9
×
T0 (input clock period) before FMODRUN
changes to "0" and the clock switches to unmodulated clock after the modulator is
disabled.
•
The FMODRUN bit is read only. Writing to FMODRUN has no effect.
•
Before changing the parameter register CMPR, the modulator must be disabled
→
FMOD=0 and FMODRUN=0.
Table 6.3-1 Function of Each Bit of the Clock Modulator Control Register (2/3)
Bit name
Function
Oscillator
Fc
Calibration time
4 MHz
64.00
μ
s
5 MHz
51.20
μ
s
6 MHz
42.67
μ
s
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
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Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
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Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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