PCF8811USLASH2DASLASH1 datasheet(16/73 Pages) PHILIPS

16 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

11 SERIAL INTERFACING (SPI AND SERIAL

INTERFACE)

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

Serial peripheral interface

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.

11.1.1

WRITE MODE

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).

handbook, full pagewidth

SCE

D/C

SCLK

SDATA

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

MGW744

Fig.12 Serial bus protocol: transmission of one byte.

handbook, full pagewidth

SCE

D/C

SCLK

SDATA

DB7 DB6 DB5 DB4 DB3 DB2

DB1 DB0

DB7

DB7 DB6 DB5 DB4 DB3 DB2

DB1 DB0

DB6 DB5

MGW745

Fig.13 Serial bus protocol: transmission of several bytes.

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