
APPENDIX A LIST OF PERIPHERAL CIRCUIT CONTROL REGISTERS
S1C31D50/D51 TECHNICAL MANUAL
Seiko Epson Corporation
AP-A-23
(Rev. 2.00)
Address
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
48
pin
64
pin
80
pin
100
pin
0x0020
028c
P8MODSEL
(P8 Port Mode Select
Register)
15–8 –
0x00
–
R
–
– – – –
7
P8SEL7
0
H0
R/W –
– –
✓
✓
6
P8SEL6
0
H0
R/W
– –
✓
✓
5
P8SEL5
0
H0
R/W
✓
✓
✓
✓
4
P8SEL4
0
H0
R/W
✓
✓
✓
✓
3
P8SEL3
0
H0
R/W
✓
✓
✓
✓
2
P8SEL2
0
H0
R/W
–
✓
✓
✓
1
P8SEL1
0
H0
R/W
–
✓
✓
✓
0
P8SEL0
0
H0
R/W
– –
✓
✓
0x0020
028e
P8FNCSEL
(P8 Port Function
Select Register)
15–14 P87MUX[1:0]
0x0
H0
R/W –
– –
✓
✓
13–12 P86MUX[1:0]
0x0
H0
R/W
– –
✓
✓
11–10 P85MUX[1:0]
0x0
H0
R/W
✓
✓
✓
✓
9–8 P84MUX[1:0]
0x0
H0
R/W
✓
✓
✓
✓
7–6 P83MUX[1:0]
0x0
H0
R/W
✓
✓
✓
✓
5–4 P82MUX[1:0]
0x0
H0
R/W
–
✓
✓
✓
3–2 P81MUX[1:0]
0x0
H0
R/W
–
✓
✓
✓
1–0 P80MUX[1:0]
0x0
H0
R/W
– –
✓
✓
0x0020
0290
P9DAT
(P9 Port Data
Register)
15–14 –
0x0
–
R
–
– – – –
13 P9OUT5
0
H0
R/W –
✓
✓
✓
✓
12 P9OUT4
0
H0
R/W
✓
✓
✓
✓
11 P9OUT3
0
H0
R/W
✓
✓
✓
✓
10 P9OUT2
0
H0
R/W
✓
✓
✓
✓
9
P9OUT1
0
H0
R/W
✓
✓
✓
✓
8
P9OUT0
0
H0
R/W
✓
✓
✓
✓
7–6 –
0x0
–
R
–
– – – –
5
P9IN5
0
H0
R
–
✓
✓
✓
✓
4
P9IN4
0
H0
R
✓
✓
✓
✓
3
P9IN3
0
H0
R
✓
✓
✓
✓
2
P9IN2
0
H0
R
✓
✓
✓
✓
1
P9IN1
0
H0
R
✓
✓
✓
✓
0
P9IN0
0
H0
R
✓
✓
✓
✓
0x0020
0292
P9IOEN
(P9 Port Enable
Register)
15–14 –
0x0
–
R
–
– – – –
13 P9IEN5
0
H0
R/W –
✓
✓
✓
✓
12 P9IEN4
0
H0
R/W
✓
✓
✓
✓
11 P9IEN3
0
H0
R/W
✓
✓
✓
✓
10 P9IEN2
0
H0
R/W
✓
✓
✓
✓
9
P9IEN1
0
H0
R/W
✓
✓
✓
✓
8
P9IEN0
0
H0
R/W
✓
✓
✓
✓
7–6 –
0x0
–
R
–
– – – –
5
P9OEN5
0
H0
R/W –
✓
✓
✓
✓
4
P9OEN4
0
H0
R/W
✓
✓
✓
✓
3
P9OEN3
0
H0
R/W
✓
✓
✓
✓
2
P9OEN2
0
H0
R/W
✓
✓
✓
✓
1
P9OEN1
0
H0
R/W
✓
✓
✓
✓
0
P9OEN0
0
H0
R/W
✓
✓
✓
✓