
152
Chapter 4
Port Functions
User’s Manual U16702EE3V2UD00
(h) Pull-down resistor option register 9 (PD9)
This is a 16-bit register used to set whether to use an on-chip pull-down resistor.
This register can be read and written only in 16-bit units.
However, when using the higher 8 bits of the PD9 register as the PD9H register and the lower
8 bits as the PUD9L register, PD9 can be read and written in 8-bit and 1-bit units.
Figure 4-48:
Pull-down Resistor Option Register 9 (PD9) Format
Note:
0 (Default). While OCDM = 01H the built-in pull-down function is enabled for P911, but this state
is not indicated in bit PD911 at that time. Refer to
Chapter 22
'On-Chip Debug Function' on
page 767
.
Symbol
15
14
13
12
11
10
9
8
Address
After reset
PD9H
PD915
PD914
PD913
PD912 PD911
Note
0
PD99
PD98
FFFFFCB3H
0000H
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Symbol
7
6
5
4
3
2
1
0
Address
After reset
PD9L
PD97
PD96
PD95
PD94
PD93
PD92
PD91
PD90
FFFFFCB2H
0000H
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PD9n
Connection of a pull-down resistor control (n = 0 to 15)
0
Not connected
1
Connected
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