PCF8811USLASH2DASLASH1 datasheet(26/73 Pages) PHILIPS

26 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

handbook, full pagewidth

MGW750

Sr 01111

acknowledgement

from PCF8811

NOT acknowledgement

from Master

status information

slave address

STOP condition

R/W

Fig.29 Master receives from slave transmitter (status register is read); read mode.

12.3

Command decoder

The command decoder identifies command words that are

received on the I2C-bus:

• Pairs of bytes: information in 2nd byte, first byte

determines whether information is display or instruction

data

• Stream of information bytes after Co = 0: display or

instruction data depending on last D/C.

The most significant bit of a control byte is the continuation

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

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

at 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 at 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.

13 INSTRUCTIONS

The PCF8811 interfaces via an 8-bit parallel interface, two

different 3-line serial interfaces, a 4-wire serial interface or

an I2C-bus interface. Processing of the instructions does

not require the display clock.

Data accesses to the PCF8811 can be broken down into

two areas; those that define the operating mode of the

device, and those that fill the display RAM.

In the case of the parallel and 4-wire SPI interfaces, the

distinction is the D/C pin. When the D/C pin is at logic 0,

the chip will respond to instructions as defined in Table 5.

When the D/C bit is at logic 1, the chip will send data to the

RAM.

When the 3-wire SPI, the 3-wire serial interface or the

I2C-bus interface is used, the distinction between

instructions which define the operating mode of the device

and those that fill the display RAM, is made respectively by

the display data length instruction (3-line SPI) or by the

D/C bit in the data stream (3-line serial interface and

I2C-bus interface).

There are 4 types of instructions. Those which:

1. Define the PCF8811 functions, such as display

configuration etc.

2. Set internal RAM addresses

3. Perform data transfer with internal RAM

4. Others.

In normal use, category 3 instructions are used most

frequently.

A basic and an extended instruction set is available: if the

EXT pin is set LOW the basic command set is used. If the

EXT pin is set HIGH the extended command set is used.

Both command sets are detailed in Table 5.

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