SOFTWARE SPECIFICATION

Interface Protocol

The interface protocol comprises:

A start condition (s)

A chip address byte, containing the TDA7312

address (the 8th bit of the byte must be 0). The

TDA7312 must always acknowledge at the end

of each transmitted byte.

A sequence of data (N-bytes + acknowledge)

A stop condition (P)

TDA7312 ADDRESS

MSB

first byte

LSB

MSB

LSB

MSB

LSB

S

1

0

0

0

1 ADDR

2

ADDR

1

0

ACK

DATA

ACK

DATA

Data Transferred (N-bytes + Acknowledge)

ACK = Acknowledge

S = Start

P = Stop

SOFTWARE SPECIFICATION

Chip address

1

MSB

00

01

ADDR

2

ADDR

1

0

LSB

DATA BYTES

MSB

LSB

FUNCTION

0

1

1

0

0

0

0

0

0

1

1

1

B2

0

1

0

1

1

B1

B1

B1

D2

0

1

B0

B0

B0

D1

C3

C3

A2

A2

A2

S2

C2

C2

A1

A1

A1

S1

C1

C1

A0

A0

A0

S0

C0

C0

Volume control

Speaker ATT L

Speaker ATT R

Audio switch

Bass control

Treble control

ADDR2 ADDR1

CHIP ADDRESS

0

0

88 HEX

0

1

8A HEX

1

0

8C HEX

1

1

8E HEX

TDA7312

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