Datasheet

CHAPTER 9 REAL-TIME COUNTER
User’s Manual U18698EJ1V0UD
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9.4.2 Reading/writing real-time counter
Read or write the counter when RWAIT = 1.
Figure 9-19. Procedure for Reading Real-Time Counter
Reading MIN
RWAIT = 1
Reading SEC
Start
RWST = 1?
Stops SEC to YEAR counters.
Mode to read and write count values
Reads second count register.
Reads minute count register.
No
Yes
Reading HOUR
Reads hour count register.
Reading WEEK
Reads week count register.
Reading DAY
Reads day count register.
Reading MONTH
Reads month count register.
Reading YEAR
Reads year count register.
RWAIT = 0
RWST = 0?
Note
No
Yes
Sets counter operation.
Checks wait status of counter.
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 read in any sequence.
All the registers do not have to be set and only some registers may be read.