STCF06 datasheet(19/33 Pages) STMICROELECTRONICS

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I²C bus interface

STCF06

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8.5

Writing to a single register

Writing to a single register starts with a START bit followed by the 7 bit device address of

STCF06. The 8th bit is the R/W bit, which is 0 in this case. R/W = 1 means a reading

operation. Then the master waits for an acknowledge from STCF06. Then the 8 bit address

of register is sent to STCF06. It is also followed by an acknowledge pulse. The last

transmitted byte is the data that is going to be written to the register. It is again followed by

an acknowledge pulse from STCF06. Then master generates a STOP bit and the

communication is over. See Figure 8 below.

8.6

Interface protocol

The interface protocol is composed:

- A start condition (START)

- A Device address + R/W bit (read =1 / write =0)

- A Register address byte

- A sequence of data n* (1 byte + acknowledge)

- A stop condition (STOP)

Table 8. Interface protocol

Device address + R/W bit

Data

765

3210

765

321

Figure 8.

Writing to a single register

DEVICE

ADDRESS

7 bits

ADDRESS OF

DATA

SDA LINE

DEVICE

ADDRESS

7 bits

ADDRESS OF

DATA

DEVICE

ADDRESS

7 bits

ADDRESS OF

DATA

SDA LINE

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