AT89C51SND2C-7FTUL Atmel, AT89C51SND2C-7FTUL Datasheet - Page 65

• Manufacturer Part Number: AT89C51SND2C-7FTUL
• Description: IC 8051 MCU FLASH 64K MP3 100BGA
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND2C-7FTUL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IDE/ATAPI, MMC, SPI, UART/USART, USB
• Peripherals: Audio, I²S, MP3, PCM, POR, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b; D/A 2x20b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFBGA
• Data Bus Width: 8 bit
• Data Ram Size: 2.25 KB
• Interface Type: ATAPI, I2S, IDE, SPI, UART, USB
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: AT89C51SND2C7FTUL

13.2
13.2.1
13.2.2
13.2.3
13.3
13.3.1
13.3.2
4341H–MP3–10/07
Audio Controls
Decoding Errors
Volume Control
Equalization Control
Special Effect
Layer Error
Synchronization Error
The MP3 decoder implements volume control on both right and left channels. The MP3VOR and
MP3VOL registers allow a 32-step volume control according to Table 13-2.
Table 13-2.
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 13-3.
Table 13-3.
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.
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.
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.
The ERRSYN flag in MP3STA is set when no synchronization pattern is found in the data that
have been sent to the decoder.
BAS4:0 or MED4:0 or TRE4:0
Volume Control
Bass, Medium, Treble Control
VOL4:0 or VOR4:0
00000
00001
00010
00000
00001
00010
11110
11111
11110
11111
AT8xC51SND2C/MP3B
Volume Gain (dB)
Gain (dB)
Mute
+1.5
-1.5
-33
-27
-14
-10
- ∞
+1
0
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