HD64F3687GHV Datasheet, PDF (207/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 10 Realtime Clock (RTC)
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.
Initial
Bit
Bit Name Value
7
RUN
—
6
12/24
—
5
PM
—
4
RST
0
3
INT
—
2 to 0 —
All 0
R/W Description
R/W RTC Operation Start
0: Stops RTC operation
1: Starts RTC operation
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.
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.
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.
R/W Interrupt Generation Timing
0: Generates a second, minute, hour, or day-of-week
periodic interrupt during RTC busy period.
1: Generates a second, minute, hour, or day-of-week
periodic interrupt immediately after completing RTC
busy period.
—
Reserved
These bits are always read as 0.
Noon
24-hour count 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
12-hour count 0 1 2 3 4 5 6 7 8 9 10 11 0 1 2 3 4 5
PM
0 (Morning)
1 (Afternoon)
24-hour count 18 19 20 21 22 23 0
12-hour count 6 7 8 9 10 11 0
PM
1 (Afternoon)
0
Figure 10.2 Definition of Time Expression
Rev. 3.00 Sep. 10, 2007 Page 173 of 528
REJ09B0216-0300