STE2007 STMicroelectronics, STE2007 Datasheet - Page 19

• Manufacturer Part Number: STE2007
• Description: 96 x 68 Single Chip LCD Controller/Driver
• Manufacturer: STMicroelectronics

STE2007
4.2
4.2.1
Figure 9.
4-Line SPI
STE2007 4-lines serial interface is a bidirectional link between the display driver and the host
processor.
It consists of four lines:
The serial interface is active only if the !CS line is low. If !CS is low after the positive edge of
!RES, the serial interface is ready to receive data after the internal reset time.
MCU TxData Mode (Write Mode)
STE2007 is always a slave device on the communication bus and receive the communication
clock on the SCL pin from the master. Information are exchanged byte-wide. During data
transfer, the data line is sampled by the receiver unit on the SCL rising edge.
D/!C line status set whether the byte is a command (D/!C =0) or a data (D/!C =1); D/!C line is
read on the eighth SCL clock pulse during every byte transfer.
If !CS stays low after the last bit of a command/data byte, the serial interface expects the MSB
of the next data byte on the next SCL positive edge.
If !CS line is forced high in the middle of a data transfer, not complete Data bytes and
Commands bytes are discarded.
A reset pulse on !RES pin interrupts any transmission.
Driver TxData
MCU TxData D/C='0'
0
MCU TxData begins
SCLK
!CS
–
–
–
–
SDA Serial Data
SCL Serial Clock
!CS Peripheral enable: - Active Low- Enables and Disables the serial interface
Mode selection (D/!C).
Self Test command writing
Timing chart for start and stop of data reading from driver
1
2
7
High Z
...
...
...
8
1
Driver TxData begins
9
0
1
7
Reading of status
2
6
High Z
...
...
...
...
7
1
8
0
MCU TxData begins
D/C writing
1
D/C
4 INTERFACE
2
7
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