UPD16488AP datasheet(76/91 Pages) NEC

Part #	UPD16488AP

Description	1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM

PDF	91 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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76 / 91 page

Data Sheet S15745EJ2V0DS

µµµµPD16488A

9. USE OF RAM TEST MODE

The

µPD16488A has a test mode for writing nine types of screen data to display RAM. When using the test mode, be sure

to execute via the sequence shown below. If executing the test mode by some other sequence, troubles may appear in the

screen display.

Operation mode

↓

Control register 1

DISP = 0, STBY = 1

Display OFF, set to standby

↓

Set RAM test mode

R44

Select RAM write data

↓

Control register 1

DISP = 0, STBY = 0

Display OFF, cancel standby

↓

Wait time

After internal operations are started, wait at least 1 sec

before turning on the LCD display Note.

↓

Control register 1

DISP = 1

Display ON

↓

Settings complete

Note

This 1 sec wait time varies according to the panel characteristics and the capacitance value of the

boost/smoothing capacitor. We recommend determining the wait time after making a thorough evaluation of the

actual device.

UPD16488AP Datasheet(PDF) 76 Page - NEC