Fujitsu F2MC-8FX Hardware Manual page 499

Hour Counter
This counter is used to count the real time "Hour".
DOW Counter
This counter is used to count the real time "Day of Week".
Day Counter
This counter is used to count the real time "Day".
Month Counter
This counter is used to count the real time "Month".
Year Counter
This counter is used to count the real time "Year".
Minute Comparator
This comparator is used to compare the minute counter and the minute compare register value .
Hour Comparator
This comparator is used to compare the hour counter and the hour compare register value.
Day Comparator
This comparator is used to compare the day counter and the day compare register value.
Month Comparator
This comparator is used to compare the month counter and the month compare register value.
Day count and leap year logic
This logic features automatic leap-year adjustment.
Auto-calibration control circuit
This circuit is used to measure the internal clock frequency and 1 HZ CALPL. And the difference value
will load to FFTR. It also generate an interrupt when overflow, underflow and completion of whole process
RTC Control register Lower (RTCCRL)
This register is used to determine the frequency of TPCLK and enable/disable TPCLK, latch counters's
values, and allow continuous counting even the CPU proceeds to stand-by mode.
RTC Control register Upper (RTCCRH)
This register is used to control the minute, hour, day and month alarm interrupt function.
CHAPTER 27 REAL TIME CLOCK
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