![](http://datasheet.mmic.net.cn/370000/UPD161401_datasheet_16743651/UPD161401_14.png)
Data Sheet S15726EJ2V0DS
14
μ
PD161401
(2/3)
Symbol
Pin Name
Pin No.
I/O
Description
/DISP
Reset
107 to 109
Input
Making /DISP low initializes the DISP flag in the control register 1
(R0) and turns OFF the display. When the serial interface is used,
the write counter is also initialized. Making /DISP high enables
writing. To light the display after it has been turned OFF by this pin,
make /DISP high and set the DISP flag to 1.
FR
Frame signal
194 to 196
I/O
This pin inputs or outputs a liquid crystal AC signal.
M,/S = H : Output
M,/S = L : Input
When two or more
μ
PD161401s are used in master/slave mode,
the respective FR pins must be connected to each other.
FR
SYNC
Frame sync signal
191 to 193
I/O
This pin inputs or outputs a liquid crystal AC sync signal.
M,/S = H : Output
M,/S = L : Input
When two or more
μ
PD161401s are used in master/slave mode,
the respective FR
SYNC
pins must be connected to each other.
DOF
Display blink
197 to 199
I/O
This pin controls blinking of the LCD.
M,/S = H : Output
M,/S = L : Input
When two or more
μ
PD161401s are used in master/slave mode,
the respective DOF pins must be connected to each other.
This pin selects master or slave mode. In the master mode, it
outputs a timing signal necessary for driving the LCD. In the slave
mode, this timing signal is input from an external source to
synchronize the LCD. M,/S = H : Master mode
M,/S = L : Slave mode
The status of each pin, including this pin, and the power circuit is
as follows depending on the status of the M,/S pin.
M,/S
Power Circuit
FR
FR
SYNC
DOF
H
Enabled
Output
Output
Output
L
Disabled
Input
Input
Input
M,/S
Master/slave
74 to 76
Input
IRS
V
LCD
adjustment
92 to 94
Input
This pin selects the resistor used to adjust the V
LCD
voltage level.
IRS = H: The internal resistor is used.
IRS = L: The internal resistor is not used.
The V
LCD
voltage level is adjusted by an external voltage divider
resistor connected to the V
R
pin.
This pin is enabled only when the master operation mode is
selected. If the slave mode is selected, this pin is fixed to H or L.