STE2004S Datasheet, PDF (37/79 Pages) STMicroelectronics – 102 x 65 single-chip LCD controller/driver

STE2004S
Bus interfaces
Throughout SDOUT can be read the driver I²C slave address or the status byte. The
command sequence that allows to read I²C slave address or the status byte is shown in
Figure 39. and Figure 40..
If the R bit is set to logic 0 and D/C=0, the I²C slave address is read. If the R bit is set to logic
1 and D/C=0, the the I²C slave address is read. SDOUT is in high impedance in steady state
and during data write.
It is possible to short circuit SDOUT and SDIN and read the I²C address or status byte
without any additional line.
Figure 38. 3-lines serial interface protocol in writing mode
WRITE MODE
1 Control Byte
DATA Byte 0 Control Byte
DATA Byte
Co
COMMAND WORD
Co LAST
CONTROL BYTE
N> 0 BYTE
MSB........LSB
C
o
R
D/
CW
0
0
HHH
E [1][0]
CONTROL BYTE
Control Byte
00
DATA Byte
DATA Byte
LAST
CONTROL BYTE
Control Byte
01
N> 0 BYTE
MSB........LSB
DATA Byte
DATA Byte
LAST
CONTROL BYTE
N> 0 BYTE
MSB........LSB
TRANSFERRED
ONLY COMMANDS
DATA Byte = Command if D/C=0
DATA Byte = DDRAM Data if D/C=1
TRANSFERRED
ONLY DDRAM DATA
LR0002
Figure 39. 3-lines SPI interface protocol in reading mode
CS
SCLK
SDIN
SDOUT
DB7 DB6 DB5 DB4 DB3
Co=1 D/C=0 R/W=1
"Command" "Read"
High-Z
DB2
DB1
DB0
Don't
Care
DB7
Don't
Care
DB6
Don't
Care
DB5
Don't
Care
DB4
Don't
Care
DB3
Don't
Care
DB2
Don't
Care
DB1
Don't
Care
DB0
High-Z
ID-Number
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
STATUS BYTE
Command Write
DATA Read
High-Z
High-Z
LR0077
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