PC2119RUSLASH2 datasheet(24/60 Pages) PHILIPS

24 / 60 page

28. August 2000

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2119x-2

Fig.16 Example of busy flag checking timing sequence.

MGA806

instruction

write

busy flag

check

busy flag

check

busy flag

check

instruction

write

internal operation

internal

DB7

R/W

data

busy

not

busy

data

8.1

Clear display

‘Clear display’ writes character code 20H into all DDRAM

addresses (the character pattern for character code 20H

must be a blank pattern), sets the DDRAM address

counter to logic 0 and returns the display to its original

position, if it was shifted. Thus, the display disappears and

the cursor or blink position goes to the left edge of the

display. Sets entry mode I/D = 1 (increment mode). S of

entry mode does not change.

The instruction ‘clear display’ requires extra execution

time. This may be allowed by checking the Busy Flag (BF)

or by waiting until the 165 clock cycles have elapsed.

The latter must be applied where no read-back options are

foreseen, as in some Chip-On-Glass (COG) applications.

8.2

Return home

‘Return home’ sets the DDRAM address counter to logic 0

and returns the display to its original position if it was

shifted. DDRAM contents do not change. The cursor or

blink position goes to the left of the first display line.

I/D and S of entry mode do not change.

8.3

Entry mode set

8.3.1

I/D

When I/D = 1 (0) the DDRAM or CGRAM address

increments (decrements) by 1 when data is written into or

read from the DDRAM or CGRAM. The cursor or blink

position moves to the right when incremented and to the

left when decremented. The cursor underline and cursor

character blink are inhibited when the CGRAM is

accessed.

8.3.2

When S = 1, the entire display shifts either to the right

(I/D = 0) or to the left (I/D = 1) during a DDRAM write. Thus

it appears as if the cursor stands still and the display

moves. The display does not shift when reading from the

DDRAM, or when writing to or reading from the CGRAM.

When S = 0, the display does not shift.

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