Fujitsu MB90390 Series Hardware Manual page 168

CHAPTER 8 LOW-POWER CONTROL CIRCUIT
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Stop mode
The stop mode cause the oscillation to stop. All functions are inactivated.
Note:
Because the stop mode turn off the oscillation clock, data can be retained at the lowest power
consumption.
In attempting to switch the clock mode, do not attempt to switch to another clock mode or low-power
consumption mode until the first switching is completed. The MCM bit of the clock selection register
(CKSCR) indicate that switching is completed.
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