pcf8814 NXP Semiconductors, pcf8814 Datasheet - Page 16

• Manufacturer Part Number: pcf8814
• Description: Pcf8814 65 X 96 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9.1.2
In the read mode of the interface the microcontroller reads
data from the PCF8814. To do so the microcontroller first
has to send the read status command, then the PCF8814
will respond by transmitting data on the SDO line. After
that SCE is required to go HIGH, (see Fig.16).
2003 Mar 13
handbook, full pagewidth
handbook, full pagewidth
65
SCLK
SDIN
SCE
SCLK
SDIN
SDO
SCE
RES
R
96 pixels matrix LCD driver
EAD MODE
data
data
display data string
DB7 DB6 DB5 DB4
data
data
data
instruction
Fig.16 Read mode, SPI 3-line and 4-line.
Fig.15 Transmission interrupted by SCE.
data
DB3
DB2
DB1 DB0
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
16
DB7 DB6 DB5 DB4 DB3
The PCF8814 samples the SDIN data at rising SCLK
edges, but shifts SDO data at falling SCLK edges. Thus
the microcontroller reads the SDO data at rising SCLK
edges.
After the read status command has been sent, the SDIN
line must be set to 3-state not later then at the falling SCLK
edge of the last bit (see Fig.16).
instruction
read out data
DB2
DB1 DB0
DB7
Objective specification
DB6 DB5 DB4
PCF8814
MBL540
MBL551