STA321 datasheet(76/157 Pages) STMICROELECTRONICS

76 / 157 page

I2C interface

STA321

76/157

Doc ID 15351 Rev 3

Multi-byte write

The multi-byte write mode starts from any internal address. The master generates a STOP

condition to terminate the transfer.

13.1.7

Read operation

Current address byte read

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

to 1. The STA321 acknowledges and then responds by sending one byte of data. The

master then terminates the transfer by generating a STOP condition.

Current address multi-byte read

The multi-byte read mode start from any internal address. Data bytes are read from

sequential addresses within the STA321. The master acknowledges each data byte read

and then generates a STOP condition to terminate the transfer.

Random address byte read

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

to 0. The STA321 acknowledges and then the master writes the internal address byte. After

receiving, the internal byte address the STA321 again responds with an acknowledge. The

master then initiates another START condition and sends the device select code with the

RW bit set to 1. The STA321 acknowledges this and then responds by sending one byte of

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

Random address multi-byte read

The multi-byte read modes start from any internal address. Data bytes are read from

sequential addresses within the STA321. The master acknowledges each data byte read

and then generates a STOP condition to terminate the transfer.

Figure 53.

I2C write operations

Figure 54.

I2C read operations

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