UPD16663 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD16663

240-OUTPUT LCD COLUMN (SEGMENT) DRIVER WITH BUILT-IN RAM

NEC => Renesas Technology 

µPD16663

5

8. INITIALIZATION FUNCTION

Two initialization functions are available in the µPD16663.

8.1 Initialization by /RESET

/RESET is used for forcible external initialization of the LSI. When /RESET = L, the internal statuses of the

µPD16663 are as follows.

ìOscillation stopped

ìLCD timing generator initialized

ìInternal timing generator initialized

ìSelf-diagnostic circuit initialized

ìGray scale palette register initialized

ìDisplay off

The display remains off for 4 frame cycles after /RESET release, even if the /DOFF pin is H.

/RESET

/FRM

/DOUT

Internal status

1

2

3

4

5

6

Display off

Display on

Be sure to initialize the LSI by /RESET when turning on the power.

8.2 Initialization by /REFRH

/REFRH is a pin used by the internal self-diagnostic circuit to initialize the LSI when there are mismatches in the

timing of the column drivers due to external noise, etc. When /REFRH = L, the internal statuses of the µPD16663

are as follows.

ìOscillation stopped

ìLCD timing generator initialized

ìInternal timing generator initialized

ìDisplay off

Data Sheet S13392EJ1V0DS00

19

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