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Pin Functions
2.2.4 Configuration of pull-up resistors
(1)
Access
Address
Initial Value
15
14
13
12
PUn15 PUn14 PUn13 PUn12 PUn11 PUn10 PUn9
R/W
R/W
R/W
R/W
Table 2-12
Caution
PUn - Port pull-up resistor option register
The PUn register specifies whether a pull-up resistor is connected to the pin.
This register can be read/written in 8-bit and 1-bit units.
16-bit registers can also be read/written in 16-bit units.
see "Port Type Diagrams" on page 51
00
or 0000
.. This register is cleared by any reset.
H
H
7
6
5
PUn7
PUn6
PUn5
R/W
R/W
R/W
11
10
9
PUn8
R/W
R/W
R/W
R/W
PUn register contents
Bit position
Bit name
7 to 0
PUn[7:0]
or
or
15 to 0
PUn[15:0]
In Port mode, (PMCnm bit = 0), the PUnm bit of the PUn register is valid only
when PMnm bit of PMn register is 0 (output mode). If PMnm bit = 1 (input
mode), the setting value of PUn register is invalid (pull-up resistor is detached).
User's Manual U18743EE1V2UM00
4
3
2
PUn4
PUn3
PUn2
R/W
R/W
R/W
8
7
6
5
PUn7
PUn6
PUn5
R/W
R/W
R/W
Specifies whether a pull-up resistor is connected to
the corresponding pin:
0: no pull-up resistor connected
1: pull-up resistor connected
Chapter 2
1
0
PUn1
PUn0
R/W
R/W
4
3
2
1
PUn4
PUn3
PUn2
PUn1
R/W
R/W
R/W
R/W
Function
0
PUn0
R/W
45
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