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UPD16314 Datasheet(PDF) 6 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
6
µµµµ PD16314
3.3 Logic System (Other Logic)
Pin Symbol
Pin Name
Pin No.
I/O
Output
Description
OSCIN
Oscillator pin
6

The resister for determining the oscillation frequency
OSCOUT
5
is externally attached to this pin.
XOUT
Oscillator output
4
CMOS
Oscillator signal output pin.
DS0
Duty selector
11
I
DS1
10
Sets the duty ratio. The duty ratio is determined by
the number of grids. The relationship between the
duty ratio and these pins is shown in 4 DUTY
RATIO SETTING.
IM
Interface select
24
I
Selects the interface mode: Serial transfer or parallel
transfer.
L: Selects serial data transfer
H: Selects parallel data transfer
(In Parallel data transfer mode, the word length
differs depending on the instruction.)
MPU
Interface select
25
I
Selects the interface mode: i80-type CPU mode or
M68-type CPU mode.
L: Selects i80-type CPU mode.
H: Selects M68-type CPU mode.
DLS
Display line select
9
I
Selects the number of display lines at power ON
reset or reset.
L: Selects 1 line (N
Note
= 0)
H: Selects 2 lines (N
Note
= 1)
R,L1
Anode output select
27
I
Sets the anode outputs. The Ox pins are set by
these pins.
R,L2
28
The relationship between Ox and Ax (anode) is
shown in 5 ANODE SETTING.
TEST
Test pin
8
I
A pin for testing the IC.
L or open: Normal operation mode
H: Test mode
TESTOUT
Test pin
33
O
A pin for testing the IC. Leave this pin open.
Note N: Display line selection flag for function setting command.
3.4 Logic System (External Extension Driver)
Pin Symbol
Pin Name
Pin No.
I/O
Output
Description
SDO
Serial data output
31
OCMOS
Serial data output for extension grid driver.
SLK
Serial clock output
32
OCMOS
Shift clock pulse for extension grid driver.
/CL
Clear signal
29
OCMOS
Clear signal for extension grid driver.
The signal is active low. The grid data stored in the
latch of the extension driver is output when this
signal is H. If this signal is L, the extension driver
outputs L.
LE
Latch enable
30
OCMOS
Latch enable signal for extension grid driver.




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