PCF8811USLASH2DASLASH1 datasheet(11/73 Pages) PHILIPS

11 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

9.1.2

EXTENDED COMMAND SET

9.1.2.1

Horizontal/vertical addressing

Two different addressing modes are possible with the

extended command set: horizontal addressing mode and

vertical addressing mode.

In the horizontal addressing mode (V = 0) the X address

increments after each byte. After the last X address,

X wraps around to 0 and Y increments to address the next

row (see Fig.4). The number of columns (last X address)

after which the wrap around must occur can be

programmed. In Fig.4 it can be seen that the X address is

programmed to be 127, and the Y address is programmed

to be 9. With X max and Y max the X and Y addresses can

be programmed while the whole RAM is not being used.

In the vertical addressing mode (V = 1) the Y address

increments after each byte. After the last Y address

(Y = 9), Y wraps around to 0 and X increments to address

the next column (see Fig.5). The last Y address after which

Y wraps to 0 can be programmed. In Fig.5 it can be seen

that the X address is programmed to be 127, and the

Y address is programmed to be 9. With X max and Y max

the X and Y addresses can be programmed while the

whole RAM is not being used.

After the very last address the address pointers wrap

around to address X = 0 and Y = 0 in both horizontal and

vertical addressing modes.

handbook, full pagewidth

MGW736

128

129

130

256

257

258

384

385

386

512

513

514

640

641

642

127

X address

Y address

768

769

770

896

897

898

1024 1025 1026

1152 1153 1154

1279

Fig.4 Sequence of writing data bytes into RAM with horizontal addressing (V = 0) (extended command set).

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