STE2007 datasheet(21/62 Pages) STMICROELECTRONICS

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STE2007

Interface

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4.2.1.1 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.

Figure 12.

4-lines SPI Data Transfer break condition

4.2.1.2 Data/command transfer pause

It is possible while transferring Frame Memory Data, Commands or Command Parameters

to insert a pause in the data transmission (!CS Line HIGH after 8 Bits Received). When !CS

is forced high after a whole byte received, the received byte is processed. Then STE2007 is

forced in a wait state ready to restart processing incoming data from the point where the

communication has been paused

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

D/!C

!CS

SDA

SCL

LR0192

COMMAND/PARAMETER

Break

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