Datasheet

Section 11 Realtime Clock (RTC)
Rev.7.00 Dec. 24, 2008 Page 358 of 698
REJ09B0074-0700
11.4 Operation
11.4.1 Initial Settings of Registers after Power-On and Resetting Procedure
The RTC registers that store second, minute, hour, day-of week, operating mode, and A.M./P.M.
data are not reset by an STBY input. Therefore, all registers must be set to their initial values after
power-on and STBY input. Figure 11.3 shows the initial setting and resetting procedures of the
RTC. Once the register setting are made, the RTC provides an accurate time as long as power is
supplied regardless of a RES input.
RST in RTCCR1=1
RST in RTCCR1=0
Set RSECDR, RMINDR,
RHRDR, RWKDR,
12/24 in RTCCR1, and PM
RUN in RTCCR1=1
Clock count controller is reset.
Second, minute, hour, day-of-week,
operating mode, and a.m/p.m are set.
RTC operation is started.
Figure 11.3 Initial Setting Procedure