SH7763 Datasheet, PDF (843/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 22 Realtime Clock (RTC)
22.4.17 RTC Control Register (RCR3) and Year-Alarm Register (RYRAR)
RCR3 and RYRAR are readable/writable registers. RYRAR is the alarm register for the RTC's
BCD-coded year-value counter RYRCNT. When the YENB bit of RCR3 is set to 1, the RYRCNT
value is compared with the RYRAR value. Comparison between the counter and the alarm register
only takes place with the alarm registers in which the ENB and YENB bits are set to 1. The alarm
flag of RCR1 is only set to 1 when the respective values all match.
The setting range of RYRAR is decimal 0000 to 9999, and normal operation is not obtained if a
value beyond this range is set here.
RCR3 is initialized by a power-on reset, but RYRAR will not be initialized by a power-on or
manual reset.
Bits 6 to 0 of RCR3 are always read as 0. A write to these bits is invalid. If a value is written to
these bits, it should always be 0.
• RCR3
Bit: 7
6
5
4
3
2
1
0
YENB — — — — — — —
Initial value: — 0
0
0
0
0
0
0
R/W: R/W R R R R R R R
• RYRAR
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
1000 years
100 years
10 years
1 year
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 777 of 1956
REJ09B0256-0100