STCF04 datasheet(20/43 Pages) STMICROELECTRONICS

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Detailed description

STCF04

20/43

Doc ID 022927 Rev 3

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

- A STOP condition (STOP)

The register address byte determines the first register in which the read or write operation

takes place. When the read or write operation is finished, the register address is

automatically incremented.

8.1.13

Writing to a single register

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

STCF04. The 8th bit is the R/W bit, which is 0 in this case. R/W = 1 means a reading

operation. The master then waits for an acknowledgement from the STCF04. The 8-bit

The last transmitted byte is the data to be written to the register. It is again followed by an

acknowledge pulse from the STCF04. The master then generates a STOP bit and the

communication is over. See

Figure 9 below.

Figure 9.

Writing to a single register

8.1.14

Writing to multiple registers with incremental addressing

It would be impractical to send the device address and the address of the register when

writing to multiple registers several times. The STCF04 supports writing to multiple registers

with incremental addressing. When data is written to a register, the address register is

automatically incremented, so the next data can be sent without sending the device address

and the register address again. See

Figure 10 below.

Table 8.

Interface protocol

Device address + R/W bit

Data

765

3210

321

765

3210

DEVICE

ADDRESS

7 bits

ADDRESS OF

DATA

SDA LINE

AM11863v1

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