PCF8811USLASH2DASLASH1 datasheet(17/73 Pages) PHILIPS

17 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

handbook, full pagewidth

SCE

SCLK

SDATA

DB7 DB6 DB5 DB4

display length instruction

and length data (two bytes)

DB2

DB1 DB0

DB2

data

last

data

DB7 DB6 DB5

DB4 DB3

DB1 DB0

MGW746

instruction

display data string

Fig.14 Transmission of several bytes.

handbook, full pagewidth

MGW747

SCE

SCLK

SDATA

data

DB7

DB7 DB6 DB5 DB4 DB3 DB2

DB1 DB0

DB6 DB5

DB4

instruction

display data string

Fig.15 Transmission interrupted by SCE.

11.1.2

READ MODE (ONLY EXTENDED COMMAND SET)

The read mode of the interface means that the

microcontroller reads data from the PCF8811. To do so the

microcontroller first has to send a command (the read

status command) and then the PCF8811 will respond by

transmitting data on the SDO line. After that SCE is

required to go HIGH (see Fig.16).

The PCF8811 samples the SDIN data on rising SCLK

edges, but shifts SDO data on falling SCLK edges. Thus

the microcontroller is supposed to read SDO data on rising

SCLK edges.

After the read status command has been sent, the SDIN

line must be set to 3-state not later then the falling SCLK

edge of the last bit (see Fig.16).

The serial interface timing diagram is given in Chapter 19.

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