SH7709S Datasheet, PDF (466/807 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

Bit 0—Start Bit (START): Halts and restarts the counter (clock).
Bit 0: START
Description
0
Second/minute/hour/day/week/month/year counter halts
1
Second/minute/hour/day/week/month/year counter runs normally
(Initial value)
Note: The 64-Hz counter always runs unless stopped with the RTCEN bit.
13.3 RTC Operation
13.3.1 Initial Settings of Registers after Power-On
All the registers should be set after the power is turned on.
13.3.2 Setting the Time
Figure 13.2 shows how to set the time when the clock is stopped. This works when the entire
calendar or clock is to be set. Programming can be easily performed.
To reset the divider circuit (RTC prescaler
and R64CNT) and set the counter
Stop clock,
Write 1 to RESET and 0 to
reset divider circuit START in the RCR2 register
Set seconds, minutes,
hour, day, day of the Order is irrelevant
week, month and year
Start clock
Write 1 to START in the
RCR2 register
Figure 13.2 Setting the Time
Rev. 5.00, 09/03, page 422 of 760