Fujitsu F2MC-16LX Hardware Manual page 237

CHAPTER 11 WATCH TIMER
I Sub-clock stable oscillation wait function
For a power-on reset or restoration from the stop mode, the watch timer functions as the timer
for the oscillation stabilization wait time of the sub-clock. The oscillation stabilization wait time of
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the sub-clock is fixed at 2 cycles of the sub-clock.
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