TDA7513T datasheet(40/84 Pages) STMICROELECTRONICS

40 / 84 page

Functional description

TDA7513T

40/84

3.9.6

Device addressing

To start the communication between two devices, the bus master must initiate a start

instruction sequence, followed by an eight bit word corresponding to the address of the

device.

The device recognizes the following two addresses:

–

1100010d

tuner part address

–

1000110d

stereo decoder / audio processor address (APSD)

The last bit of the start instruction defines the type of operation to be performed:

–

when set to "1", a read operation is selected (data are transferred from the device

to the master)

–

when set to "0", a write operation is selected (data are transferred from the master

to the device)

The device connected to the bus will compare its own hardwired addresses with the slave

address being transmitted after detecting a START condition.

After this comparison, the device will generate an "acknowledge" on the SDA line and will

perform either a read or a write operation according to the state of the R/W bit.

3.9.7

Write operation

Following a START condition the master sends a slave address word with the R/W bit set to

"0". The device will generate an "acknowledge" after this first transmission and will wait for a

second word (the subaddress field).

This 8-bit address field provides an access to any of the 64 internal addresses (32

corresponding to the tuner address and 32 corresponding to the stereo decoder / audio

processor address). Upon receipt of the subaddress the device will respond with an

"acknowledge".

At this time, all the following words transmitted to the device will be considered as Data.

The internal address may be automatically incremented if the auto-increment mode is

selected (bit S5 of the subaddress word) .

After each word has been received the device will answer with an "acknowledge".

3.9.8

Read operation

IF the master sends a slave address word with the R/W bit set to "1", the device will transmit

one 8-bit data word.

This data word content changes according to the address corresponding to the tuner or to

the stereo decoder / audio processor. The information are the following:

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