Datasheet

Section 10 Realtime Clock (RTC)
Rev. 2.00 Jul. 04, 2007 Page 217 of 692
REJ09B0309-0200
10.3.5 RTC Control Register 1 (RTCCR1)
RTCCR1 controls start/stop and reset of the clock timer. For the definition of time expression, see
figure 10.2.
Bit Bit Name
Initial
Value
R/W Description
7 RUN —/(0)* R/W RTC Operation Start
0: Stops RTC operation
1: Starts RTC operation
6 12/24 —/(0)* R/W Operating Mode
0: RTC operates in 12-hour mode. RHRDR counts on 0
to 11.
1: RTC operates in 24-hour mode. RHRDR counts on 0
to 23.
5 PM —/(0)* R/W A.m./P.m.
0: Indicates a.m. when RTC is in the 12-hour mode.
1: Indicates p.m. when RTC is in the 12-hour mode.
4 RST 0 R/W Reset
0: Normal operation
1: Resets registers and control circuits except RTCCSR
and this bit. Clear this bit to 0 after having been set
to 1.
3 — — R/W Reserved
The write value should be 0.
2 to 0 — All 0 — Reserved
These bits are always read as 0.
Note: * This is the initial value after a reset by the RST bit in RTCCR1.