2000 Nov 22

15

Philips Semiconductors

Product specification

65

× 102 pixels matrix LCD driver

PCF8812

10.3

Function set

10.3.1

PD

disconnected

• Oscillator off (external clock possible)

• Serial bus; command; etc. function

• RAM contents not cleared; RAM data can be written

10.3.2

V

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

data is written into the DDRAM as shown in Fig.5. When

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

written into the DDRAM as shown in Fig.6.

10.3.3

H

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

Y address’, ‘set X address’ and set the PRS bit (low or high

range of the high voltage generator) can be performed,

when H = 1 the others can be executed. The commands

‘write data’ and ‘function set’ can be executed in both

cases.

10.4

Display control

10.4.1

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

10.5

Set Y address of RAM

Y3 to Y0 defines the Y address vector address of the

display RAM (see Table 3).

Table 3

X/Y address range: note 1

Note

1. In bank 8 only the LSB is accessed.

10.6

Set X address of RAM

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

10.7

Set HV-generator stages

The PCF8812 incorporates a software configurable voltage multiplier. After reset (RES) the voltage multiplier is set to

2

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