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Rev. 5.00, 09/03, page 416 of 760
13.2.10 Minute Alarm Register (RMINAR)
The minute alarm register (RMINAR) is an 8-bit readable/writable register, and an alarm register
corresponding to the BCD-coded minute section counter RMINCNT of the RTC. When the ENB
bit is set to 1, a comparison with the RMINCNT 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 00–59 (decimal) + ENB bit. Errant operation will result if any other
value is set.
The ENB bit in RMINAR is initialized by a power-on reset. The remaining RMINAR fields are
not initialized and retain their contents by a manual reset, or in standby mode.
Bit:76543210
ENB 10 minutes 1 minute
Initial value:0 ———————
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
13.2.11 Hour Alarm Register (RHRAR)
The hour alarm register (RHRAR) is an 8-bit readable/writable register, and an alarm register
corresponding to the BCD-coded hour section counter RHRCNT of the RTC. When the ENB bit is
set 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 and retain their contents by a manual reset, or in standby mode.
Bit:76543210
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