PCF8811 データシートの表示（PDF） - Philips Electronics

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PCF8811

80×128 pixels matrix LCD driver

Philips Electronics 

Philips Semiconductors

80 × 128 pixels matrix LCD driver

Product specification

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

012

128 129 130

256 257 258

384 385 386

512 513 514

640 641 642

768 769 770

896 897 898

1024 1025 1026

1152 1153 1154

0

X address

0

Y address

1279

127

9

MGW736

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

2004 May 17

11

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