PCF85133USLASH2DASLASH1 datasheet(22/41 Pages) NXP

22 / 41 page

PCF85133_1

Product data sheet

Rev. 1 — 17 February 2009

22 of 41

NXP Semiconductors

PCF85133

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 PCF85133 are deﬁned in Table 9.

[1]

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

Table 9.

Deﬁnition of commands

Command

Operation code

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[1]

disabled (blank)

enabled

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]

0000000 to

0111011

immediate data

7-bit binary value of 0 to 79, transferred to the data pointer to

deﬁne one of 80 display RAM addresses

Table 12.

Device-select command bit description

See Section 7.12.

Bit

Symbol

Value

Description

7 to 3

11100

ﬁxed value

2 to 0

A[2:0]

000 to 111

immediate data

3-bit binary value of 0 to 7, transferred to the subaddress

counter to deﬁne one of 8 hardware subaddresses

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