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(g) Pull-up resistor option register 1 (PU1)
This is an 8-bit register used to set whether to use an on-chip pull-up resistor.
This register can be read and written in 8-bit or 1-bit units.
Symbol
PU1
R/W
(h) Pull-down resistor option register 1 (PD1)
This is an 8-bit register used to set whether to use an on-chip pull-down resistor.
This register can be read and written in 8-bit or 1-bit units.
Symbol
PD1
R/W
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Chapter 4 Port Functions
Figure 4-16: Pull-up Resistor Option Register 1 (PU1) Format
7
6
5
4
0
0
0
0
R/W
R/W
R/W
R/W
PU1n
Connection of a pull-up resistor control (n = 0 to 2)
0
Not connected
1
Connected
Figure 4-17: Pull-down Resistor Option Register 1 (PD1) Format
7
6
5
4
0
0
0
0
R/W
R/W
R/W
R/W
PD1n
Connection of a pull-down resistor control (n = 0 to 2)
0
Not connected
1
Connected
User's Manual U16702EE3V2UD00
3
2
1
0
PU12
PU11
PU10
R/W
R/W
R/W
R/W
3
2
1
0
PD12
PD11
PD10
R/W
R/W
R/W
R/W
0
Address
After reset
FFFFFC42H
00H
0
Address
After reset
FFFFFCA2H
00H
121
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