PCF8813 datasheet(19/72 Pages) PHILIPS

19 / 72 page

2004 Mar 05

Philips Semiconductors

Product speciﬁcation

(67 + 1)

× 102 pixels matrix LCD driver

PCF8813

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.18 Transmission interrupted by SCE.

9.1.2

READ MODE

The interface read mode means that the microcontroller

reads data from the PCF8813. To do so the microcontroller

first has to send a command, the read status command,

and then the PCF8813 will respond by transmitting data on

the SDOUT line. After that SCE is required to go HIGH

before a new command is sent (see Fig.17).

The PCF8813 samples SDATA at rising SCLK edges, but

shifts SDOUT data at falling SCLK edges. Thus the

microcontroller reads SDOUT data at rising SCLK edges.

After the read status command has been sent, the SDATA

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

edge of the last bit (see Fig.19).

handbook, full pagewidth

RES

SCLK

SDATA

DB7 DB6 DB5 DB4

DB2

DB3

DB1 DB0

SDO

instruction

DB2

DB7 DB6 DB5

DB4 DB3

DB1 DB0

MGU629

read out data

SCE

Fig.19 SPI 3-line and 4-line read mode.

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