CS7666 datasheet(17/42 Pages) CIRRUS

17 / 42 page

CS7666

DS302PP1

HIGH for READ packets. The master can read and

write to non-existent registers within the selected

device. WRITE operations will have no effect;

READ operations will return a value of 00h.

Station Address

Each device on the I

2C bus has a unique 7-bit ad-

dress. An eighth bit, the R/W bit, determines if the

current data transfer writes data to the slave device

or reads data from the slave device. It is common to

represent the station address and R/W bit as two 8-

bit station addresses, one address for write accesses

and another address for read accesses. We will fol-

low this practice. The CS7666 default station ad-

dress is 34h for writes and 35h for reads. The

station address can be changed by writing a new

station address to register FFh. The value written to

this register does not include the R/W bit. For ex-

ample. The default station address (34h write / 35h

read) will be stored as 1Ah in register FFh.

Write Operations in Three-Byte Mode

The WRITE format consists of a three-byte packet.

The first byte is the station address with the data di-

rection bit set LOW to indicate a write. The second

byte is the device register address (0..255). The

third byte is the register data (0..255). No addition-

al bytes are allowed.

Address Set Operation

The ADDRESS SET format consists of a two-byte

packet which sets the address of a subsequent

READ operation. The first byte of the Station Ad-

dress with the LSB (data direction bit) set LOW to

indicate a write operation. The second byte is the

mat is the same as the WRITE format, without the

Read Operations in Three-Byte Mode

The READ operation may consist of two or more

bytes. The first byte is the station address with the

LSB (data direction bit) set HIGH indicating a read

operation. The addressed device then sends one or

more bytes back from the register last addressed by

the previous WRITE operation or the previous AD-

DRESS SET operation.

Operating CS7666 in Four-Byte I2C Config-

uration

In this configuration the external controller talks

only to the CS7666 through the primary I

2C inter-

face. All the other slave devices on the camera

External

EPROM

CS7615

CS7666

controller

CS4954

Figure 7. I2C configuration showing primary

and secondary I2C busses.

To other sub-systems

Byte Sequence

WRITE Format Packet Detail

First Byte

Station Address with LSB Set LOW

Second Byte

Device Register Address (0..255)

Third Byte

Table 8. WRITE Format Packet

Byte Sequence

ADDRESS SET format

Packet Details

First Byte

Station Address with LSB Set LOW

Second Byte

Device Register Address (0..255)

Table 9. ADDRESS SET Format Packet Operation

Byte Sequence

READ Format Packet Details

First Byte

Station Address with LSB set HIGH;

Source Device then Returns One

Byte of Register Data (0..255)

Second Byte

Returned data from CS7666

Table 10. READ Format Packet.

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