10-14
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
RTCA Hour/Minute Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
RTCAHUR
15
–
0
–
R
–
14
RTCAP
0
H0
R/W
13
–
12
RTCHH[1:0]
0x1
H0
R/W
11
–
8
RTCHL[3:0]
0x2
H0
R/W
7
–
0
–
R
6
–
4
RTCMIH[2:0]
0x0
H0
R/W
3
–
0
RTCMIL[3:0]
0x0
H0
R/W
Bit 15
Reserved
Bit 14
RTCAP
This bit is used to set and read A.M. or P.M. data in 12H mode (RTCACTLL.RTC24H bit = 0).
1 (R/W): P.M.
0 (R/W): A.M.
In 24H mode (RTCACTLL.RTC24H bit = 1), this bit is fixed at 0 and writing 1 is ignored.
However, if the RTCAHUR.RTCAP bit = 1 when changed to 24H mode, it goes 0 at the next
count-up timing of the hour counter.
Bits 13
–
12 RTCHH[1:0]
Bits 11
–
8 RTCHL[3:0]
The RTCAHUR.RTCHH[1:0] bits and the RTCAHUR.RTCHL[3:0] bits are used to set and read
the 10-hour digit and the 1-hour digit of the hour counter, respectively. The setting/read
values are a BCD code within the range from 1 to 12 in 12H mode or 0 to 23 in 24H mode.
Note:
Be sure to avoid writing to the RTCAHUR.RTCHH[1:0]/RTCHL[3:0] bits while the RTCACTLL.
RTCBSY bit = 1.
Bit 7
Reserved
Bits 6
–
4
RTCMIH[2:0]
Bits 3
–
0
RTCMIL[3:0]
The RTCAHUR.RTCMIH[2:0] bits and the RTCAHUR.RTCMIL[3:0] bits are used to set and
read the 10-minute digit and the 1-minute digit of the minute counter, respectively. The
setting/read values are a BCD code within the range from 0 to 59.
Note:
Be sure to avoid writing to the RTCAHUR.RTCMIH[2:0]/RTCMIL[3:0] bits while the RT-
CACTLL.RTCBSY bit = 1.
Summary of Contents for S1C31D50
Page 461: ...25 1 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 25 Package TQFP12 48PIN ...
Page 462: ...25 2 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP13 64PIN ...
Page 463: ...25 3 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 TQFP14 80PIN ...
Page 464: ...25 4 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP15 100PIN ...