STCF03I datasheet(17/33 Pages) STMICROELECTRONICS

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Introduction

STCF03I

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7.8

Writing to a single register

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

STCF03I. 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 STCF03I. Then the 8 bit address

of register is sent to STCF03I. 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 STCF03I. The master then generates a STOP bit and the

communication is over. See Figure 9 below.

7.9

Interface protocol

The interface protocol is composed of (Table 8):

– 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 9.

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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