Rev. 5.00, 09/03, page 418 of 760
13.2.13 Date Alarm Register (RDAYAR)
The date alarm register (RDAYAR) is an 8-bit readable/writable register, and an alarm register
corresponding to the BCD-coded date section counter RDAYCNT of the RTC. When the ENB bit
is set to 1, a comparison with t he RDA YCNT value is performed. From among the registers
RSECAR, RMINAR, RHRAR, RWKAR, RDAYAR, RMONAR, the counter and alarm register
comparison is performed only on those with ENB bits set to 1, and if e a ch of those coincide, an
RTC alarm interrupt is generated.
The range that can be set is 01–31 (decimal) + ENB bit. Errant ope ration will result if any other
value is set. The RDAYCNT range that can be set changes with some months and in leap years.
Please confirm the correct setting.
The ENB bit in RDAYAR is initialized by a power-on reset. The remaining RDAYAR fields are
not initialized and retain their contents by a manual reset, or in standby mode.
Bit:76543210
ENB — 10 days 1 day
Initial value:0 0 ——————
R/W: R/W R R/W R/W R/W R/W R/W R/W
13.2.14 Month Alarm Register (RMONAR)
The month alarm register (RMONAR) is an 8-bit readable/writable register, and an alarm register
corresponding to the BCD-coded month section coun t er RMO NCN T of th e RTC. When t he ENB
bit is set to 1, a comp arison with the RMONCNT val ue is performe d. From among the registers
RSECAR, RMINAR, RHRAR, RWKAR, RDAYAR, RMONAR, the counter and alarm register
comparison is performed only on those with ENB bits set to 1, and if e a ch of those coincide, an
RTC alarm interrupt is generated.
The range that can be set is 01–12 (decimal) + ENB bit. Errant ope ration will result if any other
value is set.
The ENB bit in RMONAR is initialized by a power-on reset. The remaining RMONAR fields are
not initialized and retain their contents by a manual reset, or in standby mode.
Bit:76543210
ENB — — 10
months 1 month
Initial value:0 0 0 —————
R/W: R/W R R R/W R/W R/W R/W R/W