PCF85176 datasheet(23/43 Pages) NXP

23 / 43 page

PCF85176_1

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Product data sheet

Rev. 01 — 14 April 2010

23 of 43

NXP Semiconductors

PCF85176

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 PCF85176 are defined in Table 8.

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

shown in Figure 17. When this bit is set logic 1, it indicates that the next byte of the

transfer to arrive will also represent a command. If this bit is set logic 0, it indicates that

the command byte is the last in the transfer. Further bytes will be regarded as display data

(see Table 9).

[1]

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

Table 8.

Definition of PCF85176 commands

Bit position labelled as - is not used.

Command

Operation Code

Reference

Bit

mode-set

M[1:0]

Table 10

load-data-pointer

P[5:0]

Table 11

device-select

110

0A[2:0]

Table 12

bank-select

Table 13

blink-select

BF[1:0]

Table 14

Table 9.

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 10.

Mode-set command bit description

Bit

Symbol

Value

Description

0, 1see Table 9

6 to 5

fixed value

unused

display status

disabled[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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