APPENDIX A LIST OF PERIPHERAL CIRCUIT CONTROL REGISTERS
AP-A-4
Seiko Epson Corporation
S1C17M20/M21/M22/M23/M24/M25
TECHNICAL MANUAL (Rev. 1.0)
0x40a0–0x40a4
Watchdog Timer (WDT2)
Address
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
0x40a0 WDTCLK
(WDT2 Clock Control
Register)
15–9 –
0x00
–
R
–
8
DBRUN
0
H0
R/WP
7–6 –
0x0
–
R
5–4 CLKDIV[1:0]
0x0
H0
R/WP
3–2 –
0x0
–
R
1–0 CLKSRC[1:0]
0x0
H0
R/WP
0x40a2 WDTCTL
(WDT2 Control
Register)
15–11 –
0x00
–
R
–
10–9 MOD[1:0]
0x0
H0
R/WP
8
STATNMI
0
H0
R
7–5 –
0x0
–
R
4
WDTCNTRST
0
H0
WP
Always read as 0.
3–0 WDTRUN[3:0]
0xa
H0
R/WP –
0x40a4 WDTCMP
(WDT2 Counter Com-
pare Match Register)
15–10 –
0x00
–
R
–
9–0 CMP[9:0]
0x3ff
H0
R/WP
0x40c0–0x40d2
Real-time Clock (RTCA)
Address
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
0x40c0 RTCCTL
(RTC Control
Register)
15 RTCTRMBSY
0
H0
R
–
14–8 RTCTRM[6:0]
0x00
H0
W
Read as 0x00.
7
–
0
–
R
–
6
RTCBSY
0
H0
R
5
RTCHLD
0
H0
R/W Cleared by setting the
RTCCTL.RTCRST bit to 1.
4
RTC24H
0
H0
R/W –
3
–
0
–
R
2
RTCADJ
0
H0
R/W Cleared by setting the
RTCCTL.RTCRST bit to 1.
1
RTCRST
0
H0
R/W –
0
RTCRUN
0
H0
R/W
0x40c2 RTCALM1
(RTC 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
0x40c4 RTCALM2
(RTC 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
0x40c6 RTCSWCTL
(RTC 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