R01UH0823EJ0100 Rev.1.00
Page 776 of 1823
Jul 31, 2019
RX23W Group
28. Realtime Clock (RTCe)
28.2.13
Date Alarm Register (RDAYAR)/Binary Counter 0 Alarm Enable Register
(BCNT0AER)
(1) In calendar count mode:
The RDAYAR register is an alarm register corresponding to the BCD-coded date counter RDAYCNT. When the ENB bit
is set to 1, the RDAYAR value is compared with the RDAYCNT value. From among the alarm registers (RSECAR,
RMINAR, RHRAR, RWKAR, RDAYAR, RMONAR, and RYRAREN), only those selected with the ENB bits set to 1
are compared with the corresponding counters. When the respective values all match, the IR flag corresponding to the
ALM interrupt is set to 1.
RDAYAR values from 01 through 31 (in BCD) can be specified; if a value outside of this range is specified, the RTC
does not operate correctly.
After writing to the RDAYAR register, confirm that its value has actually changed before proceeding with further
processing. Refer to
section 28.6.5, Notes When Writing to and Reading from Registers
for notes on accessing
registers.
This register is set to 00h by an RTC software reset.
(2) In binary count mode:
The BCNT0AER register is a readable/writable register for setting the alarm enable corresponding to 32-bit binary
counter b7 to b0. Among the ENB[31:0] bits, the binary counter (BCNT[31:0]) corresponding to the bits which are set to
1 and the binary alarm register (BCNTAR[31:0]) are compared, and when all match, the IR flag corresponding to the
ALM interrupt becomes 1.
This register is set to 00h by an RTC software reset.
Address(es): RTC.RDAYAR 0008 C418h
b7
b6
b5
b4
b3
b2
b1
b0
ENB
—
DATE10[1:0]
DATE1[3:0]
Value after reset:
x
x
x
x
x
x
x
x
x: Undefined
Bit
Symbol
Bit Name
Description
R/W
b3 to b0
1 Day
Value for the ones place of days
R/W
b5, b4
10 Days
Value for the tens place of days
R/W
b6
—
Reserved
Set this bit to 0. It is read as the set value.
R/W
b7
ENB
0: The register value is not compared with the RDAYCNT counter value.
1: The register value is compared with the RDAYCNT counter value.
R/W
Address(es): RTC.BCNT0AER 0008 C418h
b7
b6
b5
b4
b3
b2
b1
b0
ENB[7:0]
Value after reset:
x
x
x
x
x
x
x
x
x: Undefined