STCF04TBR datasheet(21/43 Pages) STMICROELECTRONICS

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STCF04

Detailed description

Doc ID 022927 Rev 3

21/43

8.1.15

Reading from a single register

The reading operation 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. The STCF04 confirms receipt of

the address + R/W bit by an acknowledge pulse. The address of the register that should be

read is sent afterwards and confirmed again by an acknowledge pulse of the STCF04 again.

Then the master generates a START bit again and sends the device address followed by the

R/W bit, which is now 1. The STCF04 confirms receipt of the address + R/W bit by an

acknowledge pulse and starts to send the data to the master. No acknowledge pulse from

the master is required after receiving the data. Then the master generates a STOP bit to

terminate the communication. See

Figure 11.

8.1.16

Reading from multiple registers with incremental addressing

Reading from multiple registers starts in the same way as reading from a single register. As

soon as the first register is read, the register address is automatically incremented. If the

master generates an acknowledge pulse after receiving the data from the first register, then

reading of the next register can start immediately without sending the device address and

the register address again. The last acknowledge pulse before the STOP bit is not required.

See

Figure 12.

Figure 10.

Writing to multiple registers with incremental addressing

AM11864v1

DEVICE

ADDRESS

7 bits

ADDRESS OF

DATA i

DATA i +1

DATA i +2

DATA i+2

DATA i +n

SDA LINE

Figure 11.

Reading from a single register

AM11865v1

DEVICE

ADDRESS

7 bits

ADDRESS

DEVICE

ADDRESS

7 bits

DATA

SDA LINE

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