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UPD78044F Datasheet(PDF) 98 Page - NEC

Part # UPD78044F
Description  8-bit Single-Chip Microcontroller
PDF  472 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD78044F Datasheet(HTML) 98 Page - NEC

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98
Chapter 4
Port Functions
User’s Manual U16504EE1V1UD00
(2)
Pull-up resistor option register (PU0, PU3, PU4, PU6, PU8, PU9)
This register is used to set whether to use an internal pull-up resistor at each port or not. A pull-up
resistor is internally used at bits which are set to the input mode at a port where on-chip pull-up
resistor use has been specified with PUm (m = 0, 3, 4, 6, 8, 9). No on-chip pull-up resistors can be
used to the bits set to the output mode, irrespective of PU setting.
PUm is set with an 1-bit or an 8-bit memory manipulation instruction.
RESET input sets this register to 00H.
Figure 4-12:
Pull-Up Resistor Option Register (PUm) Format
Remark:
The pull-up option is not available for P60 and P61.
Caution:
Once the software can't use pull-up resistors are connected by setting 1 to the
pull-up resistor option register, they are not disconnected even in output mode. To
switch off the pull-up resistors must be written to the pull-up resistor option register.
7654
3210
R/W
Address
After
Reset
PU0
0000
PU03
PU02
PU01
PU00
R/W
FF30H
00H
7654
3210
R/W
Address
After
Reset
PU3
PU37
PU36
PU35
PU34
0000
R/W
FF33H
00H
7654
3210
R/W
Address
After
Reset
PU4
PU47
PU46
PU45
PU44
PU43
PU42
PU41
PU40
R/W
FF34H
00H
7654
3210
R/W
Address
After
Reset
PU6
0
0
PF65
PF64
PF63
PF62
0
0
R/W
FF36H
00H
7654
3210
R/W
Address
After
Reset
PU8
PU87
PU86
PU85
PU84
PU83
PU82
PU81
PU80
R/W
FF38H
00H
7654
3210
R/W
Address
After
Reset
PU9
PU97
PU96
PU95
PU94
PU93
PU92
PU91
PU90
R/W
FF39H
00H
PUmn
PUmn Pin Internal Pull-up Resistor Selection
(m = 0, 3, 4, 6, 8, 9; n = 0 - 7)
0
On-chip pull-up resistor not used
1
On-chip pull-up resistor used



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