SC7312

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.2

2004.08.03

Http: www.silan.com.cn

Page 8 of 13

Fig. 19 Acknowledge on the I

6. Transmission without acknowledge

Avoiding to detect the acknowledge of the audioprocessor, the microprocessor can use a simpler transmission:

simply it waits one clock without checking the slave acknowledgig, and sends the new data.

This approach of course is less protected from mis-working and decreases the noise immunity.

SOFTWARE SPECIFICATION

1. Interface protocol

The interface protocol comprises:

•

A start conditions

•

A chip address byte, containing the SC7312 address(the 8

must always acknowledge at the end of each transmitted byte.

•

A sequence of data(N-bytes + acknowledge)

•

A stop condition (P)

2. Chips address

1 (MSB)

0

0

0

1

0

0

0 (LSB)

3. Data bytes

MSB

LSB

Function

0

0

B2

B1

B0

A2

A1

A0

Volume Control

1

1

0

B1

B0

A2

A1

A0

Speaker ATT LR

1

1

1

B1

B0

A2

A1

A0

Speaker ATT RR

1

0

0

B1

B0

A2

A1

A0

Speaker ATT LF

1

0

1

B1

B0

A2

A1

A0

Speaker ATT RF

0

1

0

G1

G0

S2

S1

S0

Audio switch

0

1

1

0

C3

C2

C1

C0

Bass control

0

1

1

1

C3

C2

C1

C0

Treble control

Note: Ax=1.25dB steps;Bx=10dB steps;Cx=2dB steps;Gx=3.75dB steps