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UPD16314 Datasheet(PDF) 5 Page - NEC

Part No. UPD16314
Description  DOT CHARACTER VFD CONTROLLER/DRIVER
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Maker  NEC [NEC]
Homepage  http://www.nec.com/
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Data Sheet S13231EJ1V0DS00
5
µµµµ PD16314
3.2 Logic system (Microprocessor Interface)
Pin Symbol
Pin Name
Pin No.
I/O
Output
Description
RS,STB
Register
select/strobe
13
I
When Parallel data transfer is selected, this pin is Register
select.
L: Select instruction register(IR).
H: Select data register(DR).
When serial data transfer mode is selected, this pin is the
strobe input. Data can be input when this signal goes L.
Command processing is performed at the rising edge of this
signal.
/CS
Chip select
26
I
When this pin is L, this device is active.
E(/RD),
SCK
Enable(read)/shift
clock
14
I
When M68 parallel data transfer mode is selected (E), this
pin is enabled. Data is written at the falling edge.
When i80 parallel data transfer selected (/RD), this pin is a
read-enable pin. When this pin is L, data is output to the
data bus.
When serial data transfer is selected, this pin is the shift
clock input. Data is written at the rising edge.
R,/W(/WR)
Read/write signal
(write)
12
I
When M68 parallel data transfer mode is selected (R,/W),
this pin is the data transfer select pin.
L: Write
H: Read
When i80 parallel data transfer mode is selected (/WR), this
pin is written a write-enable pin. Data is written at rising
edge of this signal.
When serial data transfer mode is selected this pin is fixed
to H or L.
SI,SO
Serial I/O
15
I/O
CMOS-
3-states
When serial data transfer mode is selected, this pin is used
as an I/O pin.
When parallel data transfer mode is selected, this pin is
fixed to H or L. DB0 to DB7
DB0 - DB7
Parallel data I/O
16 to 23
I/O
CMOS-
3-states
When parallel data transfer mode is selected, these pins
are used as I/O pins.
When 4-bits transfer mode is selected, DB4 to DB7 are
used. Data is transferred starting from the most significant
bit (MSB) and stored sequentially.
/RESET
Reset
7
I
L: Initializes all the internal registers and commands.
Anode and grid outputs are fixed to VSS2.




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