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STA304A

12.3 Tone Control Register (add. 08h)

This register support tone controls (bass and treble). The step size is 2dB. Writing a 0000h corresponds to

+12dB of gain. Center frequencies (from which gains are measured) are 160Hz for Bass and 5,000Hz for Treble.

The default value is 0F0Fh, which corresponds to bypass of bass or treble gain. The tone feature is implemented

only on the L and R front channel.

12.4 Powerdown Ctrl/Staus Register (PCSR) : add. 26h

NOTE: Bits D0..D3 will be masked to the showed value before writing into the RAM registers, other bits will simply pass through.

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

XXXX

BA3

BA2

BA1

BA0

XXXX

TR3

TR2

TR1

TR0

TR3... TR0 or BA3... BA0

Function

0000

+12 dB of gain

0001

+10 dB of gain

0010

+8 dB of gain

0011

+6 dB of gain

0100

+4 dB of gain

0101

+2 dB of gain

0110

+1 dB of gain

0111

0 dB of gain

1000

-1 dB of gain

1001

-2 dB of gain

1010

-4 dB of gain

1011

-6 dB of gain

1100

-8 dB of gain

1101

-10 dB of gain

1110

-12 dB of gain

1111

Bypass

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

EAPD

PR5

PR4

1110

BIT

R/W

RST

NAME

DESCRIPTION

12

R/W

0

PR4

Setting this bit to 1 the BIT_CLK and the SDATA_IN signal will be fixed to the

digital low level. To resume the normal operation either an hardware reset or a

13

R/W

0

PR5

In order to set the device in a powerdown-like condition this bit must be set to 1.

still be running. DSP should start power-down sequence in order to accomplish

this request.

15

R/W

1

EAPD

The value of this bit should be checked by the DSP in order to recognize an

external power amplifier power-down request. As a consequence the DSP

should start the power-down sequence (volume fade-out)