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MB96300 Super Series Hardware Manual
used to read time (HH/MM/SS).
• In order for the Real Time Clock module to function properly, the frequency of the subclock (CLKSC) or
the RC-clock (CLKRC) must be much lower than that of the peripheral clock (CLKP1). If not, correct
values cannot be read from WTHR/WTMR/WTSR.
• Note that only byte-access is allowed to these register. So, when these registers are read at the very timing
of changing over the hour or minute boundary as shown below, there is a possibility of misjudging the
time. So, read several times to get a logically consistent value.
Example: Read begins at the second register: 02:59:59=> 03:59:59 => 03:00:00
In this case, the current time should be interpreted as 3 o'clock.
Read begins at the hour register: 02:59:59 => 02:00:00 => 03:00:00
CHAPTER 24 REAL TIME CLOCK
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