STV-6410-R01 datasheet(82/105 Pages) STMICROELECTRONICS

82 / 105 page

VV5410 & VV6410

Serial Control Bus

cd5410-6410f-3-0.fm

Commercial in confidence

82/105

9.6

Types of messages

This section gives guidelines on the basic operations to read data from and write data to the serial interface.

The serial interface supports variable length messages. A message may contain no data bytes, one data byte or many data

bytes. This data can be written to or read from common or different locations within the sensor. The range of instructions

available are detailed below.

•

Write no data byte, only sets the index for a subsequent read message.

•

Single location data write or read for monitoring (real time control)

•

Multiple location read or write for fast information transfers.

Examples of these operations are given below. A full description of the internal registers is given in the previous section. For all

examples the slave address used is 3210 for writing and 3310 for reading. The write address includes the read/write bit (the lsb)

set to zero while this bit is set in the read address.

9.6.1

Single location, single data write.

When a random value is written to the sensor, the message will look like this:

In this example, the

fineH exposure register (index = 3210) is set to 8510. The r/w bit is set to zero for writing and the inc bit (msbit

of the index byte) is set to zero to disable automatic increment of the index after writing the value. The address index is preserved

and may be used by a subsequent read. The write message is terminated with a stop condition from the master.

9.6.2

Single location, single data read.

A read message always contains the index used to get the first byte.

This example assumes that a write message has already taken place and the residual index value is 3210. A value of 8510 is read

from the

fineH exposure register. Note that the read message is terminated with a negative acknowledge (A) from the master: it is

not guaranteed that the master will be able to issue a stop condition at any other time during a read message. This is because if

the data sent by the slave is all zeros, the

sda line cannot rise, which is part of the stop condition.

Figure 38 : Single location, single write.

3210

A8510

Start

Device

Ack

address

Index

Data

Stop

Inc

Figure 39 : Single location, single read.

3310

3210

A8510

Start

Device

Ack

address

Index

Data

Stop

Master reads from slave, acknowledging

each byte

STV-6410-R01 数据表(PDF) 82 Page - STMicroelectronics

STV-6410-R01 数据表(HTML) 82 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载