SH7763 Datasheet, PDF (837/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 22 Realtime Clock (RTC)
Bits 6 to 3 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
ENB — — — — Day-of-week code
Initial value: 0
0
0
0
0 ———
R/W: R/W R R R R R/W R/W R/W
Day-of-week code
0
1
2
3
4
5
6
Day of week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
22.4.13 Day Alarm Register (RDAYAR)
RDAYAR is an 8-bit readable/writable register used as an alarm register for the RTC's BCD-
coded day value counter, RDAYCNT. When the ENB bit is set to 1, the RDAYAR value is
compared with the RDAYCNT 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 01 to 31 + ENB bit. The RTC will not operate normally if any other
value is set. The setting range for RDAYAR depends on the month and whether the year is a leap
year, so care is required when making the setting.
The ENB bit in RDAYAR is initialized by a power-on reset. The other fields in RDAYAR 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
6
5
4
3
ENB — 10-day units
2
1
0
1-day units
Initial value: 0 0 — — — — — —
R/W: R/W R R/W R/W R/W R/W R/W R/W
Rev. 1.00 Oct. 01, 2007 Page 771 of 1956
REJ09B0256-0100