PCF8813 datasheet(27/72 Pages) PHILIPS

27 / 72 page

2004 Mar 05

Philips Semiconductors

Product speciﬁcation

(67 + 1)

× 102 pixels matrix LCD driver

PCF8813

handbook, full pagewidth

MGU634

Sr 01111

acknowledge

from PCF8813

acknowledge

from PCF8813

acknowledge

from PCF8813

acknowledge

from PCF8813

acknowledge

from PCF8813

control byte

data byte

≥ 0 bytes

1 byte

slave address

MSB . . . . . . . . . . . LSB

≥ 0 bytes

A P

control byte

D/C

R/W

Fig.31 Master transmits in Hs-mode to slave receiver; write mode.

handbook, full pagewidth

MGU635

Sr 01111

acknowledgement

from PCF8813

NOT acknowledgement

from Master

status information

slave address

STOP condition

R/W

Fig.32 Master receives from slave transmitter (status register is read); read mode.

10.3

Command decoder

The command decoder identifies command words that

arrive on the I2C-bus.

• Pairs of bytes

–

first byte determines whether information is display

or instruction data

– second byte contains information.

• Stream of information bytes after CO = 0; display or

instruction data depending on last D/C-bit.

The most significant bit of a control byte is the continuation

bit CO. If this bit is logic 1, it indicates that only one data

byte, either command or RAM data, will follow. If the bit is

logic 0, it indicates that a series of data bytes, either

command or RAM data, may follow. The DB6 bit of a

control byte is the RAM data/command bit D/C. When this

bit is logic 1, it indicates that a RAM data byte will be

transferred next. If the bit is at logic 0, it indicates that a

command byte will be transferred next.

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