STE2004 Datasheet, PDF (33/66 Pages) STMicroelectronics – 102 X 65 SINGLE CHIP LCD CONTROLLER / DRIVER

Figure 41. 3-lines serial bus protocol - one byte transmission
CS
STE2004
SCLK
SDIN
SD/C
MSB
Figure 42. 3-lines serial bus protocol - several byte transmission
CS
LSB
LR0073
SCLK
SDIN
D/C
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
D/C
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
D/C
DB7
DB6
LR0074
Figure 43. 3-lines serial interface protocol in Reading Mode
CS
SCLK
SDIN
SDOUT
SD/C DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 ^{Don't Don't Don't Don't Don't Don't Don't Don't}
Care Care Care Care Care Care Care Care
High-Z
High-Z
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
ID-Number
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
STATUS BYTE
High-Z
High-Z
Command Write
DATA Read
LR0075
Figure 44. 3-lines Serial Reading Sequence
READING SEQUENCE
Write a "00000000" Instruction
SDOUT Buffer becomes active (Low Impedence)
Source 9 pulses on SCLK and
1
Read the ID Number or the Status Byte On SDOUT
SDOUT Buffer Configured in High Impedence
END OF READING SEQUENCE
note: 1) these data are not read by the display Diver
2) SDIN and SDOUT can be short circuited if the processor can configure
serial output buffers in high impedence during data read.
LR0080
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