PCF8811MU/2DA/1 PHILIPS [NXP Semiconductors], PCF8811MU/2DA/1 Datasheet - Page 20

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

Philips Semiconductors
11.2.2
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.
2004 May 17
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80
SCLK
SDIN
SDOUT
SCE
RES
SCLK
SDIN
SCE
R
128 pixels matrix LCD driver
EAD MODE
D/C
D/C
(
ONLY EXTENDED COMMAND SET
DB7
DB7
DB6 DB5 DB4
DB6 DB5 DB4
Fig.20 Write mode: interrupted by reset (RES).
Fig.21 Read mode serial interface 3-line.
DB3 DB2 DB1 DB0
)
D/C
20
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
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.
DB7 DB6 DB5 DB4 DB3 DB2 DB1
DB0
D/C
Product specification
PCF8811
DB7
MGU281
MGU282
DB6
D/C