PCF8811USLASH2DASLASH1 datasheet(20/73 Pages) PHILIPS

20 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

handbook, full pagewidth

MGU281

SCE

RES

SCLK

SDIN

DB7

D/C

DB6 DB5 DB4

DB7

DB7 DB6 DB5 DB4 DB3 DB2

DB1 DB0

DB6

D/C

Fig.20 Write mode: interrupted by reset (RES).

11.2.2

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 following byte is

transmitted in the opposite direction (using SDO) (see

Fig.21). After that, SCE is required to go HIGH before

a new command is sent.

The PCF8811 samples the SDATA data on the rising

SCLK edges, but shifts SDO data on the 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 SDATA

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

edge of the last bit (see Fig.21).

The 8th read bit is shorter than the others because it is

terminated by the rising SCLK edge (see Fig.40). The last

rising SCLK edge sets SDO to 3-state after the delay

time t4.

The serial interface timing diagram is given in Chapter 19.

handbook, full pagewidth

MGU282

SCE

SCLK

SDIN

SDOUT

DB7

D/C

DB6 DB5 DB4

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

DB3 DB2

DB1 DB0

D/C

Fig.21 Read mode serial interface 3-line.

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