PCF8578T datasheet(21/48 Pages) PHILIPS

21 / 48 page

2003 Apr 14

Philips Semiconductors

Product speciﬁcation

LCD row/column driver for

dot matrix graphic displays

PCF8578

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.14). 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 PCF8578 are defined

in Tables 5 and 6.

Fig.14 General information of command byte.

MSA833

REST OF OPCODE

MSB

LSB

C = 0; last command.

C = 1; commands continue.

Table 5

Summary of commands

Note

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

COMMAND

OPCODE(1)

DESCRIPTION

SET MODE

multiplex rate, display status, system type

SET START BANK

deﬁnes bank at top of LCD

DEVICE SELECT

deﬁnes device subaddress

RAM ACCESS

graphic mode, bank select (D D D D

≥ 12 is not

allowed; see SET START BANK opcode)

LOAD X-ADDRESS

0 to 39

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