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UPD78044F Datasheet(PDF) 95 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) 95 Page - NEC

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Chapter 4
Port Functions
User’s Manual U16504EE1V1UD00
4.2.9 Port 9
This is a 8-bit input/output port with output latches. Input mode/output mode can be specified in 1-bit
units with the port mode register 9. When P90 to P97 are used as input pins, pull-up resistors can be
connected bit-wise with the pull-up resistor option register (PU9).
These pins are dual function pin and serve as segment signal output of LCD controller/driver.
RESET input sets the input mode.
The port 9 block diagram is shown in Figure 4-10.
Caution:
See port 4 with change to PF4.
Figure 4-10:
P90 to P97 Configurations
Remarks: 1. PUO
: Pull-up resistor option register
2. PM
: Port mode register
3. RD
: Port 13 read signal
4. WR
: Port 13 write signal
Notes: 1. Set output latch to 0 when dual function shall be applied to output.
2. Disable dual function when the comment of the output latch shall be applied to output.
WRPM
WRPORT
RD
P90/TI22/S23,
P91/TO51/TI51/S22,
P92/TP0/S21,
P93/S20/SCK31,
P94/S19/SO31/SIO31,
P95/S18/SI31,
P96/S17,
P97/S16
Selector
Output Latch
(P90 to P97)
PM90 to PM97
Dual Function
Note 1
Note 2



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