SH7706 Datasheet, PDF (410/749 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7700 Series

Section 13 Realtime Clock (RTC)
13.5.3 Timing for Setting ADJ Bit in RCR2
After the ADJ bit in RCR2 of the RTC is set to 1, it takes a maximum of approximately 91.6 µs
(when a 32.768-kHz crystal resonator is connected to the EXTAL2 pin) for the setting to affect the
value read from the second counter (RSECCNT).
If the result of 30-second adjustment by the ADJ bit in RCR2 needs to be reflected in the value
read from the second counter, be sure to read from the second counter only after at least 91.6 µs
(approximately) has passed after the ADJ bit has been set to 1.
Note that 30-second adjustment is actually performed for the second counter at the time the ADJ
bit is set to 1, so this delay does not affect the RTC operation itself.
Rev. 5.00 May 29, 2006 page 362 of 698
REJ09B0146-0500