PCF8811MU/2DA/1 PHILIPS [NXP Semiconductors], PCF8811MU/2DA/1 Datasheet - Page 16

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

Philips Semiconductors
11 SERIAL INTERFACING (SPI AND SERIAL
Communication with the microcontroller can also occur via
a clock-synchronized Serial Peripheral Interface (SPI). It is
possible to select two different 3-line (SPI and serial
interface) or a 4-line serial interface. Selection is achieved
via PS[2:0]; see Section 7.12.
11.1
The serial peripheral interface is a 3-line or 4-line interface
for communication between the microcontroller and the
LCD driver chip. The 3 lines are: SCE (chip enable), SCLK
(serial clock) and SDATA (serial data). For the 4-line serial
interface a separate D/C line is added. The PCF8811 is
connected to the serial data I/O (SDA) of the
microcontroller by two pins: SDATA (data input) and SDO
(data output) connected together.
2004 May 17
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handbook, full pagewidth
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INTERFACE)
SDATA
SCLK
SCE
D/C
Serial peripheral interface
128 pixels matrix LCD driver
SDATA
SCLK
SCE
D/C
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Fig.13 Serial bus protocol: transmission of several bytes.
DB7
Fig.12 Serial bus protocol: transmission of one byte.
DB6
DB5
DB4
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
16
11.1.1
The display data/command indication may be controlled
either via software or the D/C select pin. When the D/C pin
is used, display data is transmitted when D/C is HIGH, and
command data is transmitted when D/C is LOW
(see Figs 12 and 13). When pin D/C is not used, the
display data length instruction is used to indicate that
a specific number of display data bytes (1 to 255) are to be
transmitted (see Fig.14). The next byte after the display
data string is handled as an instruction command.
When the 3-line SPI interface is used the display
data/command is controlled by software.
If SCE is pulled HIGH during a serial display data stream,
the interrupted byte is invalid data but all previously
transmitted data is valid. The next byte received will be
handled as an instruction command (see Fig.15).
DB3
W
DB2
RITE MODE
DB1
DB0
DB7
Product specification
MGW744
DB6 DB5
PCF8811
MGW745