PCF8576DT datasheet(21/41 Pages) PHILIPS

21 / 41 page

2004 Dec 22

Philips Semiconductors

Product speciﬁcation

Universal LCD driver for low

multiplex rates

PCF8576D

After an acknowledgement, one or more command bytes

follow that define the status of each addressed

PCF8576D.

The last command byte sent is identified by resetting its

most significant bit, continuation bit C, (see Fig.18). The

command bytes are also acknowledged by all addressed

PCF8576Ds on the bus.

After the last command byte, one or more display data

bytes may follow. Display data bytes are stored in the

display RAM at the address specified by the data pointer

and the subaddress counter. Both data pointer and

subaddress counter are automatically updated and the

data directed to the intended PCF8576D device.

An acknowledgement after each byte is asserted only by

the PCF8576Ds that are addressed via address lines A0,

A1 and A2. After the last display byte, the I2C-bus master

asserts a STOP condition (P). Alternately a START may

be asserted to RESTART an I2C-bus access.

7.8

Command decoder

The command decoder identifies command bytes that

arrive on the I2C-bus. All available commands carry a

continuation bit C in their most significant bit position as

shown in Fig.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.

The five commands available to the PCF8576D are

defined in Table 4.

MBA607

data line

stable;

data valid

change

of data

allowed

SDA

SCL

Fig.13 Bit transfer.

handbook, full pagewidth

MBC622

SDA

SCL

STOP condition

SDA

SCL

START condition

Fig.14 Definition of START and STOP conditions.

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