SH7763 Datasheet, PDF (836/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 22 Realtime Clock (RTC)
22.4.11 Hour Alarm Register (RHRAR)
RHRAR is an 8-bit readable/writable register used as an alarm register for the RTC's BCD-coded
hour value counter, RHRCNT. When the ENB bit is set to 1, the RHRAR value is compared with
the RHRCNT value. Comparison between the counter and the alarm register is performed for
those registers among RSECAR, RMINAR, RHRAR, RWKAR, RDAYAR, and RMONAR in
which the ENB bit is set to 1, and the RCR1 alarm flag is set when the respective values all match.
The setting range is decimal 00 to 23 + ENB bit. The RTC will not operate normally if any other
value is set.
The ENB bit in RHRAR is initialized by a power-on reset. The other fields in RHRAR are not
initialized by a power-on or manual reset.
Bit 6 is always read as 0. A write to this bit is invalid, but the write value should always be 0.
Bit: 7
ENB
Initial value: 0
R/W: R/W
6
5
4
3
2
1
0
— 10-hour units
1-hour units
0 ——————
R R/W R/W R/W R/W R/W R/W
22.4.12 Day-of-Week Alarm Register (RWKAR)
RWKAR is an 8-bit readable/writable register used as an alarm register for the RTC's BCD-coded
day-of-week value counter, RWKCNT. When the ENB bit is set to 1, the RWKAR value is
compared with the RWKCNT value. Comparison between the counter and the alarm register is
performed for those registers among RSECAR, RMINAR, RHRAR, RWKAR, RDAYAR, and
RMONAR in which the ENB bit is set to 1, and the RCR1 alarm flag is set when the respective
values all match.
The setting range is decimal 0 to 6 + ENB bit. The RTC will not operate normally if any other
value is set.
The ENB bit in RWKAR is initialized by a power-on reset. The other fields in RWKAR are not
initialized by a power-on or manual reset.
Rev. 1.00 Oct. 01, 2007 Page 770 of 1956
REJ09B0256-0100