1997 Nov 21

16

Philips Semiconductors

Product specification

65

× 102 pixels matrix LCD driver

PCF8549

Function Set

• Oscillator off (external clock possible)

• Parallel bus, command, etc. function

• RAM contents not cleared; RAM data can be written.

V

When V = 0, the horizontal addressing is selected. The

data is written into the RAM as shown in Fig.6. When

V = 1, the vertical addressing is selected. The data is

written into the RAM as shown in Fig.7.

H

When H = 0 the commands ‘display control’, ‘set

Y address’ and ‘set X address’ can be performed, when

H = 1 the other commands can be executed. The

commands ‘write data’ and ‘function set’ can be executed

in both cases.

MX

When MX = 0, the display is written from left to right (X = 0

is on the left side, X = 100 is on the right side of the

display). When MX = 1 the display is written from right to

left (X = 0 is on the right side, X = 100 is on the left side of

the display).

MY

When MY = 1, the display is mirrored vertically.

Display Control

The bits D and E select the display mode (see Table 2).

Set Y address of RAM

Y[3 : 0] defines the Y address vector address of the RAM.

Table 3

X-/Y-Address range

In bank 8 only the MSB is accessed.

Set X address of RAM

The X address points to the columns. The range of X is 0 to 101(65 hex).

Temperature Control

with lower temperature to maintain optimal contrast. There are 4 different temperature coefficients available in the

YYYY

3 210

CONTENT

ALLOWED X-RANGE

0000

bank 0 (display RAM)

0 to 101

0001

bank 1 (display RAM)

0 to 101

0010

bank 2 (display RAM)

0 to 101

0011

bank 3 (display RAM)

0 to 101

0100

bank 4 (display RAM)

0 to 101

0101

bank 5 (display RAM)

0 to 101

0110

bank 6 (display RAM)

0 to 101

0111

bank 7 (display RAM)

0 to 101

1000

bank 8 (display RAM)

0 to 101