
APPENDIX A LIST OF PERIPHERAL CIRCUIT CONTROL REGISTERS
S1C31D50/D51 TECHNICAL MANUAL
Seiko Epson Corporation
AP-A-3
(Rev. 2.00)
Address
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
0x0020
00a4
WDT2CMP
(WDT2 Counter Com-
pare Match Register)
15–10 –
0x00
–
R
–
9–0 CMP[9:0]
0x3ff
H0
R/WP
0x0020 00c0–0x0020 00d2
Real-time Clock (RTCA)
Address
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
0x0020
00c0
RTCACTLL
(RTCA Control
Register (Low Byte))
7
–
0
–
R
–
6
RTCBSY
0
H0
R
5
RTCHLD
0
H0
R/W Cleared by setting the
RTCACTLL.RTCRST bit to 1.
4
RTC24H
0
H0
R/W –
3
–
0
–
R
2
RTCADJ
0
H0
R/W Cleared by setting the
RTCACTLL.RTCRST bit to 1.
1
RTCRST
0
H0
R/W –
0
RTCRUN
0
H0
R/W
0x0020
00c1
RTCACTLH
(RTCA Control
Register (High Byte))
7
RTCTRMBSY
0
H0
R
–
6–0 RTCTRM[6:0]
0x00
H0
W
Read as 0x00.
0x0020
00c2
RTCAALM1
(RTCA Second Alarm
Register)
15 –
0
–
R
–
14–12 RTCSHA[2:0]
0x0
H0
R/W
11–8 RTCSLA[3:0]
0x0
H0
R/W
7–0 –
0x00
–
R
0x0020
00c4
RTCAALM2
(RTCA Hour/Minute
Alarm Register)
15 –
0
–
R
–
14 RTCAPA
0
H0
R/W
13–12 RTCHHA[1:0]
0x0
H0
R/W
11–8 RTCHLA[3:0]
0x0
H0
R/W
7
–
0
–
R
6–4 RTCMIHA[2:0]
0x0
H0
R/W
3–0 RTCMILA[3:0]
0x0
H0
R/W
0x0020
00c6
RTCASWCTL
(RTCA Stopwatch
Control Register)
15–12 BCD10[3:0]
0x0
H0
R
–
11–8 BCD100[3:0]
0x0
H0
R
7–5 –
0x0
–
R
4
SWRST
0
H0
W
Read as 0.
3–1 –
0x0
–
R
–
0
SWRUN
0
H0
R/W
0x0020
00c8
RTCASEC
(RTCA Second/1Hz
Register)
15 –
0
–
R
–
14–12 RTCSH[2:0]
0x0
H0
R/W
11–8 RTCSL[3:0]
0x0
H0
R/W
7
RTC1HZ
0
H0
R
Cleared by setting the
RTCACTLL.RTCRST bit to 1.
6
RTC2HZ
0
H0
R
5
RTC4HZ
0
H0
R
4
RTC8HZ
0
H0
R
3
RTC16HZ
0
H0
R
2
RTC32HZ
0
H0
R
1
RTC64HZ
0
H0
R
0
RTC128HZ
0
H0
R
0x0020
00ca
RTCAHUR
(RTCA Hour/Minute
Register)
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