RM0016 datasheet(299/467 Pages) STMICROELECTRONICS

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RM0016

Inter-integrated circuit (I2C) interface

319

EV9: ADD10= 1, cleared by reading SR1 register followed by writing DR register.

2. EV5, EV6 and EV9 events stretch SCL low until the end of the corresponding software sequence.

3. EV7 software sequence must be completed before the end of the current byte transfer. In case EV7

software sequence can not be managed before the current byte end of transfer, it is recommended to use

BTF instead of RXNE, with the drawback of slowing the communication.

When 3 bytes remain to be read:

•

RxNE = 1 => Nothing (DataN-2 not read).

•

DataN-1 received

•

BTF = 1 because both shift and data registers are full: DataN-2 in DR and DataN-1 in

the shift register => SCL tied low: no other data will be received on the bus.

•

Clear ACK bit

•

Read DataN-2 in DR => This launches the DataN reception in the shift register

•

DataN received (with a NACK)

•

Program START/STOP

•

Read DataN-1

•

RxNE = 1

•

Read DataN

The procedure described above is valid for N>2. The cases where a single byte or two bytes

are to be received should be handled differently, as described below:

•

Case of a single byte to be received:

–

In the ADDR event, clear the ACK bit.

–

Clear ADDR

–

Program the STOP/START bit.

–

Read the data after the RxNE flag is set.

•

Case of two bytes to be received:

–

Set POS and ACK

–

Wait for the ADDR flag to be set

–

Clear ADDR

–Clear ACK

–

Wait for BTF to be set

–

Program STOP

–

Read DR twice

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