STA311B datasheet(24/102 Pages) STMICROELECTRONICS

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I²C bus operation

STA311B

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DocID024340 Rev 1

7.3

Write operation

Following the START condition the master sends a device select code with the RW bit set

to 0. The STA311B acknowledges this and the writes for the byte of internal address.

After receiving the internal byte address the STA311B again responds with an

acknowledgement.

7.3.1

Byte write

In the byte write mode the master sends one data byte, this is acknowledged by the Omega

FFX core. The master then terminates the transfer by generating a STOP condition.

7.3.2

Multi-byte write

The multi-byte write modes can start from any internal address. The master generating a

STOP condition terminates the transfer.

Figure 7. Write mode sequence

7.4

Read operation

7.4.1

Current address byte read

Following the START condition, the master sends a device select code with the RW bit set

to 1. The STA311B acknowledges this and then responds by sending one byte of data. The

master then terminates the transfer by generating a STOP condition.

7.4.2

Current address multi-byte read

The multi-byte read modes can start from any internal address. Sequential data bytes are

read from sequential addresses within the STA311B. The master acknowledges each data

byte read and then generates a STOP condition, terminating the transfer.

7.4.3

Random address byte read

Following the START condition, the master sends a device select code with the RW bit set

to 0. The STA311B acknowledges this and then the master writes the internal address byte.

After receiving the internal byte address, the STA311B again responds with an

acknowledgement. The master then initiates another START condition and sends the device

select code with the RW bit set to 1. The STA311B acknowledges this and then responds by

sending one byte of data. The master then terminates the transfer by generating a STOP

condition.

DEV-ADDR

ACK

START

SUB-ADDR

ACK

DATA IN

ACK

STOP

BYTE

WRITE

DEV-ADDR

ACK

START

SUB-ADDR

ACK

DATA IN

ACK

STOP

MULTIBYTE

WRITE

DATA IN

ACK

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