PCF8579 datasheet(18/40 Pages) PHILIPS

18 / 40 page

1997 Apr 01

Philips Semiconductors

Product speciﬁcation

LCD column driver for dot matrix graphic

displays

PCF8579

8.1

Command decoder

The command decoder identifies command bytes that

arrive on the I2C-bus. The most significant bit of a

command is the continuation bit C (see Fig.12). When this

bit is set, it indicates that the next byte to be transferred will

also be a command. If the bit is reset, it indicates the

conclusion of the command transfer. Further bytes will be

regarded as display data. Commands are transferred in

WRITE mode only.

The five commands available to the PCF8579 are defined

in Tables 2 and 3.

C = 0; last command.

C = 1; commands continue.

Fig.12 General format of command byte.

MSA833

REST OF OPCODE

MSB

LSB

Table 2 Summary of commands

Note

1. C = command continuation bit. D = may be a logic 1 or 0.

COMMAND

OPCODE(1)

DESCRIPTION

SET MODE

DDDDD

multiplex rate, display status, system type

SET START BANK

1111D

deﬁnes bank at top of LCD

DEVICE SELECT

DDDD

deﬁnes device subaddress

RAM ACCESS

DDDD

graphic mode, bank select (D D D D

≥ 12 is not allowed;

see SET START BANK opcode)

LOAD X-ADDRESS

DDDDDD0 to 39

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