Fujitsu F2MC-8FX Hardware Manual page 529

CHAPTER 27 REAL TIME CLOCK
Alarm function
This alarm function allows the real time clock to generate an interrupt when one or more of the values in
hour, minute, day and month compare registers match(es) the value(s) of hour, minute, day and month
counters.
When RTCCRL:INTS is set to set to zero and RTCCRH:MOC/DC/HC/MC are set to "1". the
corresponding comparison will be continuously performed between the compare register and counter. In
case there is a match on that time information (e.g. minute) with enable bit="1". Alarm interrupt request bit
of that time information will be set and it generates an alarm interrupt IRQ.
However, if RTCCRL:INTS is one, alarm interrupt request bit of that time information is still set. but the
alarm interrupt IRQ is activated only when all the enabled comparison(s) match(es).
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