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UPD78044F Datasheet(PDF) 91 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) 91 Page - NEC

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91
Chapter 4
Port Functions
User’s Manual U16504EE1V1UD00
4.2.5 Port 4
This is an 8-bit input/output port with output latches. Input mode/output mode can be specified in 1-bit
units with the port mode register 4. When P40 to P47 are used as input pins, pull-up resistors can be
connected bit-wise with the pull-up resistor option register (PU4).
These pins are dual function pin and serve as segment signal output of LCD controller/driver.
RESET input sets the input mode.
The port 4 block diagram is shown in Figure 4-6.
Caution:
When used as segment lines, set the port function (PF4) according to its function.
Figure 4-6:
P40 to P47 Configurations
Remarks: 1. PUO
: Pull-up resistor option register
2. PM
: Port mode register
3. RD
: Port 4 read signal
4. WR
: Port 4 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
P40/S7
to
P47/S0
Selector
Output Latch
(P40 to P47)
PM40 to PM47
Dual Function
Note 1
Note 2



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