STV-6410-R01 datasheet(61/105 Pages) STMICROELECTRONICS

61 / 105 page

CMOS Sensor; Customer Datasheet, Rev 3.0, 28 September 2000

VV5410 & VV6410

Commercial in confidence

61/105

cd5410-6410f-3-0.fm

The byte following the address byte contains the address of the first data byte (also referred to as the

index). The serial interface

can address up to 128, byte registers. If the msb of the second byte is set the automatic increment feature of the address index is

selected.

9.4

Message Interpretation

All serial interface communications with the sensor must begin with a

start condition. If the start condition is followed by a valid

address byte then further communications can take place. The sensor will acknowledge the receipt of a valid address by driving

the

sda wire low. The state of the read/~write bit (lsb of the address byte) is stored and the next byte of data, sampled from sda,

can be interpreted.

During a write sequence the second byte received is an address index and is used to point to one of the internal registers. The

msbit of the following byte is the

index auto increment flag. If this flag is set then the serial interface will automatically increment

the index address by one location after each slave acknowledge. The master can therefore send data bytes continuously to the

slave until the slave fails to provide an acknowledge or the master terminates the write communication with a

stop condition or

sends a

repeated start, (Sr). If the auto increment feature is used the master does not have to send indexes to accompany the

data bytes.

As data is received by the slave it is written bit by bit to a serial/parallel register. After each data byte has been received by the

slave, an acknowledge is generated, the data is then stored in the internal register addressed by the current index.

During a read message, the current index is read out in the byte following the device address byte. The next byte read from the

slave device are the contents of the register addressed by the current index. The contents of this register are then parallel loaded

into the serial/parallel register and clocked out of the device by

scl.

At the end of each byte, in both read and write message sequences, an acknowledge is issued by the receiving device. Although

VV5410/VV6410 is always considered to be a slave device, it acts as a transmitter when the bus master requests a read from the

sensor.

At the end of a sequence of incremental reads or writes, the terminal index value in the register will be one

greater the last

location read from or written to. A subsequent read will use this index to begin retrieving data from the internal registers.

A message can only be terminated by the bus master, either by issuing a stop condition, a repeated start condition or by a

negative acknowledge after reading a complete byte during a read operation.

9.5

The Programmers Model

There may be up to 128, 8-bit registers within the camera, accessible by the user via the serial interface. They are grouped

Figure 36 : VV5410/VV6410’s Serial Interface Address

R/W

address[7:1]

W bit

DATA[7:0]

Sensor acknowledges valid address

Acknowledge from slave

INDEX[6:0]

INC

DATA[7:0]

[0]

address

Auto increment

Index bit

Figure 37 : Serial Interface Data Format

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