NEC PD17062 - Manual (Page 195)

195
µ
PD17062
15.3.3 Port0A Bit I/O Selection Register (P0ABIO)
Port0B Bit I/O Selection Register (P0BBIO)
Port1B Bit I/O Selection Register (P1BBIO)
Port1C Group I/O Selection Register (P1CGPIO)
The Port0A bit I/O selection register sets I/O for each pin of P0A. The Port0B bit I/O selection register sets
I/O for each pin of P0B. The Port1B bit I/O selection register sets I/O for each pin of P1B. The Port1C group
I/O selection register sets I/O for each pin of P1C.
The following explains the configuration and functions.
b 3 b 2 b 1 b 0
0 0 0
P
1
C
G
I
O
b 3 b 2 b 1 b 0
P
1
B
B
I
O
3
P
1
B
B
I
O
2
P
1
B
B
I
O
1
P
1
B
B
I
O
0 b 3 b 2 b 1 b 0
P
0
B
B
I
O
3
P
0
B
B
I
O
2
P
0
B
B
I
O
1
P
0
B
B
I
O
0 b 2 b 1 b 0
P
0
A
B
I
O
3
P
0
A
B
I
O
2
P
0
A
B
I
O
1
P
0
A
B
I
O
0
b 3
27H
35H
36H
37H
R/W
R/W
R/W
R/W
Read/
write
Power-on
Clock stop
CE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
0
1
Register
Flag symbol
Port1C group
I/O selection
(P1CGPIO)
Port1B bit
I/O selection
(P1BBIO)
Port0B bit
I/O selection
(P0BBIO)
Port0A bit
I/O selection
(P0ABIO)
Flag symbol
Flag symbol
Flag symbol
Address
Sets I/O of each general-
purpose port
Port0A
P0A 0 pin
P0A
1
pin
P0A 2 pin
P0A 3 pin
P0B
0
pin
P0B 1 pin
P0B 2 pin
P0B
3
pin
P1B
0
pin
P1B 1 pin
P1B 2 pin
P1B 3 pin
P1C 3 to P1C 1 pins
Port0B
Port1B
Port1C
Input port
Fixed at 0
Output port
At reset