UPD161401WSLASHP datasheet(16/126 Pages) RENESAS

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Data Sheet S15726EJ2V0DS

µµµµPD161401

(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.

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

µPD161401s are used in master/slave mode,

the respective FR pins must be connected to each other.

FRSYNC

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

µPD161401s are used in master/slave mode,

the respective FRSYNC 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

µPD161401s 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

FRSYNC

DOF

Enabled

Output

Disabled

Input

M,/S

Master/slave

74 to 76

Input

IRS

VLCD adjustment

92 to 94

Input

This pin selects the resistor used to adjust the VLCD voltage level.

IRS = H: The internal resistor is used.

IRS = L: The internal resistor is not used.

The VLCD voltage level is adjusted by an external voltage divider

resistor connected to the VR 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.

UPD161401W/P датащи(PDF) 16 Page - Renesas Technology Corp

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