PCF8811MU/2DA/1 PHILIPS [NXP Semiconductors], PCF8811MU/2DA/1 Datasheet - Page 26

• Manufacturer Part Number: PCF8811MU/2DA/1
• Description: 80 x 128 pixels matrix LCD driver
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
12.3
The command decoder identifies command words that are
received on the I
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 I
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.
2004 May 17
handbook, full pagewidth
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.
80
2
C-bus interface. Processing of the instructions does
Command decoder
128 pixels matrix LCD driver
2
C-bus:
Fig.29 Master receives from slave transmitter (status register is read); read mode.
Sr 0 1 1 1 1
slave address
S
A
acknowledgement
1
from PCF8811
S
A
0
R/W
1 A
26
status information
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
I
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
I
There are 4 types of instructions. Those which:
1. Define the PCF8811 functions, such as display
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.
2
2
C-bus interface is used, the distinction between
C-bus interface).
configuration etc.
NOT acknowledgement
from Master
STOP condition
A
P
MGW750
Product specification
PCF8811