STE2007 datasheet(16/62 Pages) STMICROELECTRONICS

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Interface

STE2007

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Interface

4.1

3-lines 9-bit serial interface

STE2007 3-lines 9 bits serial interface is a bidirectional link between the display driver and

the host processor.

It consists of three lines:

–

SDAIN/SDAOUT Serial Data

–

SCLK Serial Clock

–

!CS Peripheral enable: - Active Low- Enables and Disables the serial interface

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. Serial data

must be input to SDA in the sequence D/!C, D7 to D0. STE2007 read data on SCLK rising

edge. The first bit of serial data D/!C is data/command flag. When D/!C =”1” D7 to D0 bits

are display RAM data or Command Parameters. When D/!C=”0” D7 to D0 bits identify a

command

4.1.1

MCU TxData mode (write mode)

STE2007 is always a slave device on the communication bus and receive the

communication clock on the SCLK pin from the master. Information are exchanged word-

wide. Every word is composed by 9 bit. The first bit is named D/!C and indicates whether the

following byte is a command (D/!C =0) or a Display Data Byte (D/!C =1).

During data transfer, the data line is sampled by the receiver unit on the SCLK rising edge.

The data/command received is transferred to DDRAM or Executed on the first falling edge

after the latching rising edge or on the !CS rising edge.

If !CS stays low after the last bit of a command/data byte, the serial interface expects the

D/!C bit of the next data byte on the next SCLK positive edge.

A reset pulse on !RES pin interrupts any transmission.

Figure 5.

MCU TxData mode

4.1.1.1 Data/command transfer break

If the Host processor generates an break condition (!CS Line HIGH before having received

Bit D0) while transferring a Data byte to the Frame Memory or a Command identifier or a

command parameter, the not complete received byte is discarded, the communication is

interrupted and the interface is forced in reset state.

When !CS line becomes low again to start a new communication session STE2007 is ready

to receive the same byte interrupted re-transmitted or a new command identifier.

!CS

D/C D7

D0 D/C

SCLK

SDA

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