STA310 datasheet(72/90 Pages) STMICROELECTRONICS

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STA310

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Type: R/W

Software Reset: 0

Hardware Reset: UND

Description:

The value in this register sets the PCM beep tone fre-

quency according to the formula:

Beep_tone_frequency = (Fs/2)/(Register_value+1)

9.20 Karaoke registers

This section describes the registers which select the

karaoke effects, for example: volume, chorus, echo,

reverb and mute. Any change to these registers must

be signalled to the DSP by writing 1 to the register.

KAR_MCh0VOL

Music channel 0 (L) volume

Address: 0x81

Type: R/W

Reset value: 0xFF

Description;

This register contains the scaling factor applied to the

left channel of the music input. It specifies a fractional

multiplication factor whose value varies from 0 to 1.0:

Music Left channel = original music left channel

scale_factor.

KAR_MCh1VOL

Music channel 1 (R) volume

Address: 0x82

Type: R/W

Reset value: 0xFF

Description:

This

has

the

same

function

KAR_MCh0VOL for the right music channel.

KAR_KEYCONT

Key control (Pitch Shift) ON/OFF

Address: 0x83

Type: R/W

Reset value: 0

Description:

KAR_KEYVALUE

Key value

Address: 0x84

Type: R/W

Reset value: 0x00

Description:

The pitch shift can be changed from -3.5 to 3.5 tones,

in steps of 1/4 tone. This register sets the number of

tones according to the following table:

7654321

value

Bitfield

Description

Value

0x00: Scale factor 0 = left channel mute

0x7F: Scale factor 0.5 = half restitution of left

channel

0xFF: Scale factor 1.0 = full restitution of left

channel

7654321

value

543

Reserved

PSHIFT

Bitfield

Description

PSHIFT

0: pitch shift disabled, 1: pitch shift enabled

7654321

KEYVALUE

Key

control

(tone)

-1/

-3/

-1

1.1

1.3

1.5

1.9

-2.49 -3.5

KEYVAL

(decimal)

123456

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