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AT83SND1CXXX-ROTUL Datasheet(PDF) 65 Page - ATMEL Corporation

Part # AT83SND1CXXX-ROTUL
Description  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
PDF  212 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND1CXXX-ROTUL Datasheet(HTML) 65 Page - ATMEL Corporation

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65
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
0
BAS4:0 or MED4:0 or TRE4:0
Gain (dB)
00000
-
∞
00001
-14
00010
-10
11110
+1
11111
+1.5



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