PCF8811U/2DA/1 NXP [NXP Semiconductors], PCF8811U/2DA/1 Datasheet - Page 30

• Manufacturer Part Number: PCF8811U/2DA/1
• Description: 80 x 128 pixels matrix LCD driver
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8811_4
Product data sheet
Fig 22. Write mode: transmission of several bytes
Fig 23. Write mode: interrupted by reset (RES)
SDATA
SDATA
SCLK
SCLK
SCE
SCE
RES
10.2.2 Read mode (only extended command set)
D/C
D/C
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
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
The 8
edge; see
time t
DB7
DB7
Figure
4
th
.
DB6 DB5 DB4 DB3 DB2 DB1 DB0
DB6 DB5 DB4
read bit is shorter than the others because it is terminated by the rising SCLK
Figure
24. After that, SCE is required to go HIGH before a new command is sent.
44. The last rising SCLK edge sets SDO to 3-state after the delay
Rev. 04 — 27 June 2008
D/C
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
D/C
DB7
DB6 DB5 DB4 DB3 DB2 DB1 DB0 D/C
Figure
80 x 128 pixels matrix LCD driver
24.
D/C
PCF8811
© NXP B.V. 2008. All rights reserved.
DB7
001aai349
001aai350
DB6
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