PCF8576DTSLASH2 datasheet(25/52 Pages) NXP

25 / 52 page

PCF8576D_9

Product data sheet

Rev. 09 — 25 August 2009

25 of 52

NXP Semiconductors

PCF8576D

Universal LCD driver for low multiplex rates

7.17 Command decoder

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

The commands available to the PCF8576D are deﬁned in Table 7.

[1]

Not used.

All available commands carry a continuation bit C in their most signiﬁcant bit position as

shown in Figure 18. When this bit is set, it indicates that the next byte of the transfer to

arrive will also represent a command. If this bit is reset, it indicates that the command byte

is the last in the transfer. Further bytes will be regarded as display data (see Table 8).

[1]

The possibility to disable the display allows implementation of blinking under external control.

Table 7.

Deﬁnition of PCF8576D commands

Command

Operation Code

Reference

Bit

mode-set

[1]

Table 9

load-data-pointer

Table 10

device-select

1100A2

Table 11

bank-select

11110I

Table 12

blink-select

1110A

BF1

BF0

Table 13

Table 8.

C bit description

Bit

Symbol

Value

Description

continue bit

last control byte in the transfer; next byte will be regarded

as display data

control bytes continue; next byte will be a command too

Table 9.

Mode-set command bits description

Bit

Symbol

Value

Description

0, 1

see Table 8

6, 5

ﬁxed value

unused

display status

disabled (blank)[1]

enabled

LCD bias conﬁguration

⁄3 bias

⁄2 bias

1 to 0

M[1:0]

LCD drive mode selection

static; BP0

1:2 multiplex; BP0, BP1

1:3 multiplex; BP0, BP1, BP2

1:4 multiplex; BP0, BP1, BP2, BP3

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