pcf8813 NXP Semiconductors, pcf8813 Datasheet - Page 19

• Manufacturer Part Number: pcf8813
• Description: 67 + 1 X 102 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9.1.2
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).
2004 Mar 05
handbook, full pagewidth
handbook, full pagewidth
(67 + 1)
SDATA
SCLK
SDATA
SCE
SCLK
SDO
SCE
RES
R
EAD MODE
data
102 pixels matrix LCD driver
data
display data string
DB7 DB6 DB5 DB4
data
data
data
instruction
Fig.18 Transmission interrupted by SCE.
Fig.19 SPI 3-line and 4-line read mode.
data
DB3
DB2
DB1 DB0
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
19
DB7 DB6 DB5 DB4 DB3
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).
instruction
read out data
DB2
DB1 DB0
DB7
DB6 DB5 DB4
Product specification
PCF8813
MGU629
MGW747