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RTCA Month/Day Register
Register name
Bit
RTCAMON
15–13
12
11–8
7–6
5–4
3–0
Bits 15–13
Reserved
Bit 12
RTCMOH
Bits 11–8
RTCMOL[3:0]
The RTCAMON.RTCMOH bit and the RTCAMON.RTCMOL[3:0] bits are used to set and
read the 10-month digit and the 1-month digit of the month counter, respectively. The
setting/read values are a BCD code within the range from 1 to 12.
Note:
Be sure to avoid writing to the RTCAMON.RTCMOH/RTCMOL[3:0] bits while the RT-
CACTLL.RTCBSY bit = 1.
Bits 7–6
Reserved
Bits 5–4
RTCDH[1:0]
Bits 3–0
RTCDL[3:0]
The RTCAMON.RTCDH[1:0] bits and the RTCAMON.RTCDL[3:0] bits are used to set and
read the 10-day digit and the 1-day digit of the day counter, respectively. The
setting/read values are a BCD code within the range from 1 to 31 (to 28 for February in a
common year, to 29 for February in a leap year, or to 30 for
April/June/September/November).
Note:
Be sure to avoid writing to the RTCAMON.RTCDH[1:0]/RTCDL[3:0] bits while the RT-
CACTLL.RTCBSY bit = 1.
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
Bit name
Initial
–
0x0
RTCMOH
0
RTCMOL[3:0]
0x1
–
0x0
RTCDH[1:0]
0x0
RTCDL[3:0]
0x1
Seiko Epson Corporation
Reset
R/W
–
R
H0
R/W
H0
R/W
–
R
H0
R/W
H0
R/W
Remarks
–
10-15
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