UPD78F1502AGK-GAK-AX Datasheet, PDF (381/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 7 REAL-TIME COUNTER
Figure 7-22. Procedure for Writing Real-Time Counter
Start
RWAIT = 1
Stops SEC to YEAR counters.
Mode to read and write count values
No
RWST = 1?
Yes
Writing SEC
Writing MIN
Writing HOUR
Checks wait status of counter.
Writes second count register.
Writes minute count register.
Writes hour count register.
Writing WEEK
Writes week count register.
Writing DAY
Writes day count register.
Writing MONTH
Writes month count register.
Writing YEAR
Writes year count register.
RWAIT = 0
Sets counter operation.
No
RWST = 0?^Note
Yes
End
Note Be sure to confirm that RWST = 0 before setting STOP mode.
Caution Complete the series of operations of setting RWAIT to 1 to clearing RWAIT to 0 within 1 second.
Remark SEC, MIN, HOUR, WEEK, DAY, MONTH, and YEAR may be written in any sequence.
All the registers do not have to be set and only some registers may be written.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011