SH7763 Datasheet, PDF (834/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 22 Realtime Clock (RTC)
22.4.7 Month Counter (RMONCNT)
RMONCNT is an 8-bit readable/writable register used as a counter for setting and counting the
BCD-coded month value in the RTC. It counts on the carry generated once per month by the day
counter.
The setting range is decimal 01 to 12. The RTC will not operate normally if any other value is set.
Write processing should be performed after stopping the count with the START bit in RCR2, or
by using the carry flag.
RMONCNT is not initialized by a power-on or manual reset.
Bits 7 to 5 are always read as 0. A write to these bits is invalid, but the write value should always
be 0.
Bit: 7
6
5
4
3
2
1
0
—
—
—
10-month
unit
1-month units
Initial value: 0
0
0 —————
R/W: R R R R/W R/W R/W R/W R/W
22.4.8 Year Counter (RYRCNT)
RYRCNT is a 16-bit readable/writable register used as a counter for setting and counting the
BCD-coded year value in the RTC. It counts on the carry generated once per year by the month
counter.
The setting range is decimal 0000 to 9999. The RTC will not operate normally if any other value
is set. Write processing should be performed after stopping the count with the START bit in
RCR2, or by using the carry flag.
RYRCNT is not initialized by a power-on or manual reset.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
1000-year units
100-year units
10-year units
1-year units
Initial value: — — — — — — — — — — — — — — — —
R/W: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Rev. 1.00 Oct. 01, 2007 Page 768 of 1956
REJ09B0256-0100