STE2007 Datasheet, PDF (21/62 Pages) STMicroelectronics – 96 x 68 Single Chip LCD Controller/Driver

STE2007
4 INTERFACE
If a new command identifier is transferred after a pause condition the previous communication
session is definitively closed.
Four are the possible conditions:
– Command-Pause-Command
– Command-Pause-Parameter
– Parameter-Pause-Command
– Parameter-Pause-Parameter
Figure 13. 4-lines SPI Data Transfer Pause
Pause
!CS
D/!C
SCL
SDA
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
COMMAND/PARAMETER
COMMAND/PARAMETER
LR0191
4.2.2
Driver TxData Mode (Read Mode)
Throughout SDA line is possible to read some registers value (ID Numbers, Status byte,
temperature).
SDA (output Driver) is in High impedance in steady state and during data write.
Figure 14. 4-lines SPI 8Bit Read Cycle
Read Command
DATA
!CS
D!C
SCL
Next Command
SDA
(Input)
SDA
(Output)
D7 D6 D5 D4 D3 D2 D1 D0
High Z
High Z
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
MCU Data Tx Start
LCD Driver Data Tx Start
MCU Data Tx Start
LR0255
4.3 I²C Bus
The I²C interface is a fully complying I2C bus specification, selectable to work in both Fast
(400kHz Clock) and High Speed Mode (3.4MHz).
This bus is intended for communication between different ICs. It consists of two lines: one bi-
directional for data signals (SDA) and one for clock signals (SCL). Both the SDA and SCL lines
must be connected to a positive supply voltage via an active or passive pull-up.
The following protocol has been defined:
21/62