HD6417727BP160CV Datasheet, PDF (524/1098 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/ SH7700 Series

Section 16 Realtime Clock (RTC)
16.2.10 Minute Alarm Register (RMINAR)
The minute alarm register (RMINAR) is an 8-bit read/write alarm register that corresponds to the
BCD-coded minute section counter RMINCNT of the RTC. When the ENB bit is set to 1in
RMINAR, the RMINAR value and RMINCNT value are compared. In this way, the RSECAR,
RMINAR, RHRAR, RWKAR, RDAYAR, and RMONAR registers are checked, and when the
ENB bit is set to 1, the alarm register and the corresponding counter are compared. If all values in
the specified alarm registers and the corresponding counters match, an RTC alarm interrupt is
generated.
The settable range is “00 to 59 in decimal + ENB bit”. If other values are set, correct operation is
not provided.
Only the ENB bit in RMINAR is initialized to 0 by a power-on reset, and the other bits are not
initialized. The RMINAR contents are retained after a manual reset or in standby mode.
Bit: 7
6
5
4
3
2
1
0
ENB
10 minutes
1 minute
Initial value: 0
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—
—
—
—
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R/W: R/W R/W R/W R/W R/W R/W R/W R/W
16.2.11 Hour Alarm Register (RHRAR)
The hour alarm register (RHRAR) is an 8-bit read/write alarm register that corresponds to the
BCD-coded hour section counter RHRCNT of the RTC. When the ENB bit is set to 1in RHRAR,
the RHRAR value and RHRCNT value are compared. In this way, the RSECAR, RMINAR,
RHRAR, RWKAR, RDAYAR, and RMONAR registers are checked, and when the ENB bit is set
to 1, the alarm register and the corresponding counter are compared. If all values in the specified
alarm registers and the corresponding counters match, an RTC alarm interrupt is generated.
The settable range is “00 to 23 in decimal + ENB bit”. If other values are set, correct operation is
not provided.
Only the ENB bit in RHRAR is initialized to 0 by a power-on reset, and the other bits are not
initialized. The RHRAR contents are retained after a manual reset or in standby mode.
Bit: 7
6
5
4
3
2
1
0
ENB
—
10 hours
1 hour
Initial value: 0
0
—
—
—
—
—
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R/W: R/W
R
R/W R/W R/W R/W R/W R/W
Rev.6.00 Mar. 27, 2009 Page 466 of 1036
REJ09B0254-0600