Fujitsu F2MC-8L F202RA Hardware Manual page 87

CHAPTER 3 CPU
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Oscillation Stabilization Wait Time
The oscillator for oscillation frequency stops in stop mode, thus oscillation stabilization wait time must be
applied after the oscillator is activated.
Use one of three clock oscillation stabilization wait time settings generated by the time-base timer.
If the interval selected for the time-base timer is shorter than the oscillation stabilization wait time, an
interval timer interrupt request is generated during oscillation stabilization wait time. To prevent this from
occurring, disable output of time-base timer interrupt requests (TBTC: TBIE = 0) before transition to stop
mode when necessary.
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