PCF8534AUSLASHDASLASH1 datasheet(26/47 Pages) NXP

26 / 47 page

PCF8534A_5

Product data sheet

Rev. 05 — 6 August 2009

26 of 47

NXP Semiconductors

PCF8534A

Universal LCD driver for low multiplex rates

8.3 Command decoder

The command decoder identiﬁes command bytes that arrive on the I2C-bus. There are

ﬁve commands:

Table 9.

Deﬁnition of commands

Command

Opcode

Reference

Mode set

100E

Table 10

Load data pointer

Table 11

Device select

1100A2

Table 12

Bank select

11110I

Table 13

Blink select

1110A

BF1

BF0

Table 14

Table 10.

Mode set command bit description

Bit

Symbol

Value

Description

7 to 4

1100

ﬁxed value

display status

the possibility to disable the display allows implementation of

blinking under external control

disabled (blank)

enable

LCD bias conﬁguration

⁄3 bias

⁄2 bias

1 to 0

M[1:0]

LCD drive mode selection

static; 1 backplane

1:2 multiplex; 2 backplanes

1:3 multiplex; 3 backplanes

1:4 multiplex; 4 backplanes

Table 11.

Load data pointer command bit description

See Section 7.11.

Bit

Symbol

Value

Description

ﬁxed value

6 to 0

P[6:0]

000 0000 to

011 1011

7-bit binary value of 0 to 59

Table 12.

Device select command bit description

See Section 7.12.

Bit

Symbol

Value

Description

7 to 3

1 1100

ﬁxed value

2 to 0

A[2:0]

000 to 111

3-bit binary value of 0 to 7

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