Data Sheet S13392EJ1V0DS00

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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

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/DOUT

Internal status

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

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