PCF8534 datasheet(23/40 Pages) PHILIPS

23 / 40 page

PCF8534_0

Preliminary datasheet

Rev. 00.05 — 20 February 2007

23 of 40

NXP Semiconductors

PCF8534

Universal LCD driver for low multiplex rates

7.9 Command decoder

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

commands available to the PCF8534 are defined in Table 8.

Table 8.

Definition of PCF8534 commands

Command

OPCODE

Options

Description

Mode set

1 1 00E BM1M0

Table 9

defines LCD drive mode

Table 10

defines LCD bias configuration

Table 11

defines display status; the possibility to disable

the display allows implementation of blinking

under external control

Load data pointer

0 P6 P5 P4 P3 P2 P1 P0

Table 12

7 bits of immediate data, bits P6 to P0, are

transferred to the data pointer to define one of 8

hardware subaddresses

Device select

1 1 10 0A2A1A0

Table 13

3 bits of immediate data, bits A0 to A3 are

transferred to the subaddress counter to define

one of 8 hardware subaddresses

Bank select

1 1 1 1 1 0 I O

Table 14

defines input bank selection (storage of arriving

display data)

Table 15

defines output bank selection (retrieval of LCD

display data); the BANK SELECT command has

no effect in 1:3 or 1:4 multiplex drive modes

Blink

1 1 1 1 0 A BF BF

Table 16

defines the blinking frequency

Table 17

selects the blinking mode; normal operation with

frequency set by BF1, BF0 or blinking by

alteration of display RAM banks. Alteration

blinking does not apply in 1:3 or 1:4 multiplex

drive modes.

Table 9.

Mode set option 1

LCD drive mode

Bits

Drive mode

Backplane

static

1 BP

1:2

MUX (2BP)

1:3

MUX (3BP)

1:4

MUX (4BP)

Table 10.

Mode set option 2

LCD bias

Bit B

⁄3 bias

⁄2 bias

Table 11.

Mode set option 3

Display status

Bit E

disabled (blank)

enabled

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