RM0352 datasheet(75/138 Pages) STMICROELECTRONICS

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RM0352

I2C bus interface

137

[9] RESERVED

FRX flushes the receive circuitry (FIFO, fsm). The configuration of the I

node (register setting) is not affected by the flushing operation. The flushing

operation is performed on modules working on different clock domains

(system and I

C clocks) and needs several system clock cycles before to be

completed. On the completion, the I

C node (internal logic) clears this bit. The

application must not access to the Rx FIFO during the flushing operation and

should poll on this bit waiting for the completion.

0: flush operation is completed (I

C controller clears the bit)

1: flush operation is started and in progress (set by application).

FRX: flush receive.

[8]

[7]

FTX: flush transmit.

FTX flushes the transmit circuitry (FIFO, fsm). The configuration of the I

node (register setting) is not affected by the flushing operation. The flushing

operation is performed on modules working on different clock domains

(system and I

C clocks) and needs several system clock cycles before to be

completed. On the completion, the I

C node (internal logic) clears this bit. The

application must not access to the Tx FIFO during the flushing operation and

should poll on this bit waiting for the completion.

0: flush operation is completed (I

C controller clears the bit)

1: flush operation is started and in progress (set by application).

[6]

SGCM: slave general call mode. SGCM defines the operating mode of the

slave controller when a general call is received. This setting does not affect

the hardware general call that is always managed in transparent mode.

0: transparent mode, the slave receiver recognizes the general call at any

action is taken by software after the decoding of the message included in the

Rx FIFO.

1: direct mode, the slave receiver recognizes the general call and executes

directly (without software intervention) the related actions. Only the status

code word is stored in the I2C_SR register for notification to the application.

[5:4] SM: Speed Mode. SM defines the speed mode related to the serial bit rate:

00: Standard mode (up to 100 K/s)

01: Fast mode (up to 400 K/s)

10: Reserved

11: Reserved.

[3] SAM: Slave Addressing Mode. SAM defines the slave addressing mode when

the peripheral works in slave or master/slave mode. The received address is

compared with the content of the register I2C_SCR.

0: 7-bit addressing mode

1: 10-bit addressing mode.

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