AT83SND1CXXX-ROTIL datasheet(65/212 Pages) ATMEL

65 / 212 page

4109J–8051–10/06

AT8xC51SND1C

Table 59. Volume Control

12.2.2

Equalization Control

Sound can be adjusted using a 3-band equalizer: a bass band under 750 Hz, a medium band

from 750 Hz to 3300 Hz and a treble band over 3300 Hz. The MP3BAS, MP3MED, and

MP3TRE registers allow a 32-step gain control in each band according to Table 60.

Table 60. Bass, Medium, Treble Control

12.2.3

Special Effect

The MPBBST bit in MP3CON register allows enabling of a bass boost effect with the following

characteristics: gain increase of +9 dB in the frequency under 375 Hz.

12.3

Decoding Errors

The three different errors that can appear during frame processing are detailed in the following

sections. All these errors can trigger an interrupt as explained in Section "Interrupt", page 66.

12.3.1

Layer Error

The ERRSYN flag in MP3STA is set when a non-supported layer is decoded in the header of the

frame that has been sent to the decoder.

12.3.2

Synchronization Error

The ERRSYN flag in MP3STA is set when no synchronization pattern is found in the data that

have been sent to the decoder.

12.3.3

CRC Error

When the CRC of a frame does not match the one calculated, the flag ERRCRC in MP3STA is

set. In this case, depending on the CRCEN bit in MP3CON, the frame is played or rejected. In

both cases, noise may appear at audio output.

VOL4:0 or VOR4:0

Volume Gain (dB)

00000

Mute

00001

-33

00010

-27

11110

-1.5

11111

BAS4:0 or MED4:0 or TRE4:0

Gain (dB)

00000

∞

00001

-14

00010

-10

11110

11111

+1.5

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