STE2004S datasheet(37/79 Pages) STMICROELECTRONICS

37 / 79 page

STE2004S

Bus interfaces

37/79

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

Figure 39.

3-lines SPI interface protocol in reading mode

WRITE MODE

COMMAND WORD

CONTROL BYTE

MSB........LSB

LAST

N> 0 BYTE

DATA Byte

Control Byte

DATA Byte

CONTROL BYTE

[1]

Control Byte

[0]

DATA Byte

Control Byte

DATA Byte

CONTROL BYTE

MSB........LSB

LAST

N> 0 BYTE

DATA Byte = Command

if D/C=0

DATA Byte = DDRAM Data if D/C=1

DATA Byte

Control Byte

DATA Byte

CONTROL BYTE

MSB........LSB

LAST

N> 0 BYTE

TRANSFERRED

ONLY COMMANDS

TRANSFERRED

ONLY DDRAM DATA

LR0002

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Don't

Care

SDIN

SCLK

High-Z

DB1

DB0

High-Z

Don't

Care

Don't

Care

Don't

Care

Don't

Care

Don't

Care

Don't

Care

Don't

Care

Command Write

DATA Read

DB7

DB6

DB5

DB4

DB3

DB2

Co=1

D/C=0

"Command"

R/W=1

"Read"

SDOUT

High-Z

DB1

DB0

High-Z

DB7

DB6

DB5

DB4

DB3

DB2

ID-Number

STATUS BYTE

LR0077

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