STW8009 datasheet(49/66 Pages) STMICROELECTRONICS

49 / 66 page

Bus interface

STw8009/STw8019

48/65

Figure 18.

2-wire serial MPU control interface format (I2C compatible) / 7-bit addresses

10 bits address mode

In Write mode, several data can be sent without re-initializing a transfer, in this case, data is

written in successive registers. (

Figure 19: 2-wire serial MPU control interface format (I2C

compatible) / 10-bit addresses)

In Read mode: (

Figure 19)

●

Double transaction read:

The operation is split into two transactions:

The first one is a write that transmits the desired address. The I2C interface memorizes

the address of the register.

The second transfer is a read that can be repeated to read successive registers. After

each read byte and except for the last one, the master issues an “acknowledge”. The

master indicates that it is reading the last byte by issuing a “no acknowledge” instead of

an “acknowledge”.

Note:

Only the higher part of the address is sent again before sending the read indication.

●

Single transaction read:

As opposed to the double transaction, instead of stopping the first transaction and

starting the second one, the transactions are combined with a repeated start condition.

STw8009 slave address

r/w

STw8009 register address

Write (0)

* Write operation (7 bits addresses)

S Start condition

Stop condition A/NA Acknowledge / No Acknoledge

STw8009 register data

Can be repeated n times to write in successive registers

From master to slave

From slave to master

STw8009 slave address

r/w

STw8009 register address

Write (0)

* Double transaction read

STw8009 slave address

r/w

STw8009 register data

A/NA

Read (1)

Can be repeated n times to read in successive registers

Repeated start condition

STw8009 slave address

r/w

A STw8009 register address

Write (0)

* Single transaction read

STw8009 register data

Can be repeated n times

to read in successive registers

STw8009 slave address

r/w

Read (1)

A/NA

STw8009 slave address

r/w

STw8009 register address

Write (0)

* Write operation (7 bits addresses)

S Start condition

Stop condition A/NA Acknowledge / No Acknoledge

STw8009 register data

Can be repeated n times to write in successive registers

From master to slave

From slave to master

STw8009 slave address

r/w

STw8009 register address

Write (0)

* Double transaction read

STw8009 slave address

r/w

STw8009 register data

A/NA

Read (1)

Can be repeated n times to read in successive registers

Repeated start condition

STw8009 slave address

r/w

A STw8009 register address

Write (0)

* Single transaction read

STw8009 register data

Can be repeated n times

to read in successive registers

STw8009 slave address

r/w

Read (1)

A/NA

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