SH7730 Datasheet, PDF (581/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 Series

Section 17 Realtime Clock (RTC)
17.3.11 Hour Alarm Register (RHRAR)
RHRAR is an alarm register corresponding to the BCD coded hour counter RHRCNT of the RTC.
When the ENB bit is set to 1, a comparison with the RHRCNT value is performed. From among
RSECAR/RMINAR/RHRAR/RWKAR/RDAYAR/RMONAR/RCR3, the counter and alarm
register comparison is performed only on those with ENB bits set to 1, and if each of those
coincide, an alarm flag of RCR1 is set to 1.
The range of hour alarm, which can be set, is 00 to 23 (decimal). 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.
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
Bit
7
6
5, 4
3 to 0
Initial
Bit Name Value
R/W
ENB
0
R/W

0
R

Undefined R/W

Undefined R/W
Description
When this bit is set to 1, a comparison with the
RHRCNT value is performed.
Reserved
This bit is always read as 0. The write value should
always be 0.
Ten’s position of hours setting value
One’s position of hours setting value
Rev. 1.00 Sep. 19, 2007 Page 533 of 1136
REJ09B0359-0100