Fujitsu FR60 Hardware Manual page 172

CHAPTER 3 CPU AND CONTROL UNITS
■ Precautions on Using the Main Clock Oscillation Stabilization Wait Timer
Use the oscillation stabilization wait time as a reference value because the oscillation cycle is unstable
immediately after oscillation is started.
No main clock oscillation stabilization interrupt is generated while main clock oscillation is stopped. This
is because the counter is stopped when main clock oscillation is stopped. Do not stop main clock oscillation
if it is necessary to use the main clock oscillation stabilization interrupt for processing.
If a WIF flag setting request occurs at the same time as a zero-clearance request from the CPU, the WIF
setting request has priority and the zero-clearance request is ignored.
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