SH7708 Datasheet, PDF (338/625 Pages) Renesas Technology Corp – SuperH™ RISC engine

1 2 . 2 . 1 1 Hour Alarm Register (RHRAR)
The hour alarm register (RHRAR) is an 8-bit read/write register, and an alarm register
corresponding to the BCD-coded hour section counter RHRCNT of the RTC. When the ENB
bitisset to 1, a comparison with the RHRCNT value is performed. From among the RSECAR,
RMINAR, RHRAR, RWKAR, RDAYAR, RMONAR registers, the counter and alarm register
comparison is performed only on those with ENB bits set to 1, and if each of those coincide, an
RTC alarm interrupt is generated.
The range that can be set is 00–23 (decimal) + ENB bit. Errant operation will result if any other
value is set.
The ENB bit in RHRAR is initialized by a power-on reset. The remaining RHRAR fields are not
initialized by a power-on reset or manual reset, or in standby mode. Contents are retained in a
manual reset and in standby mode.
Bit: 7
6
5
4
3
2
1
0
Bit name: ENB
—
10 hours
1 hour
Initial value: 0
0
—
—
—
—
—
—
R/W: R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
1 2 . 2 . 1 2 Day of the Week Alarm Register (RWKAR)
The day of the week alarm register (RWKAR) is an 8-bit read/write register, and an alarm register
corresponding to the BCD-coded day of week section counter RWKCNT of the RTC. When the
ENB bit is set to 1, a comparison with the RWKCNT value is performed. From among the
RSECAR, RMINAR, RHRAR, RWKAR, RDAYAR, RMONAR registers, the counter and alarm
register comparison is performed only on those with ENB bits set to 1, and if each of those
coincide, an RTC alarm interrupt is generated.
The range that can be set is 0–6 (decimal) + ENB bit. Errant operation will result if any other
value is set.
The ENB bit in RWKAR is initialized by a power-on reset. The remaining RWKAR fields are not
initialized by a power-on reset or manual reset, or in standby mode. Contents are retained in a
manual reset and in standby mode.
Bit: 7
6
5
4
3
2
1
0
Bit name: ENB
—
—
—
—
Day of week
Initial value: 0
0
0
0
0
—
—
—
R/W: R/W
R
R
R
R
R/W R/W R/W
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