AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 73

• Manufacturer Part Number: AT83C51SND1C_03
• Description: Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
• Manufacturer: ATMEL [ATMEL Corporation]

Audio Output
Interface
Description
Figure 48. Audio Interface Block Diagram
4109E–8051–06/03
MP3 Decoder
Request To
Audio Data
Audio Data
From MP3
From C51
CLOCK
Decoder
Sample
AUD
AUDCON1.0
16
AUDEN
8
The AT8xC51SND1C implement an audio output interface allowing the audio bitstream
to be output in various formats. It is compatible with right and left justification PCM and
I
allows connection of almost all of the commercial audio DAC families available on the
market.
The audio bitstream can be from 2 different types:
•
•
The C51 core interfaces to the audio interface through five special function registers:
AUDCON0 and AUDCON1, the Audio Control registers (see Table 84 and Table 85);
AUDSTA, the Audio Status register (see Table 86); AUDDAT, the Audio Data register
(see Table 87); and AUDCLK, the Audio Clock Divider register (see Table 88).
Figure 48 shows the audio interface block diagram, blocks are detailed in the following
sections.
MP3 Buffer
Audio Buffer
AUDCON1.2:1
2
AUDDAT
S formats and thanks to the on-chip PLL (see Section “Clock Controller”, page 12)
Data Ready
DUP1:0
AUDCON1.6
DRQEN
The MP3 decoded bitstream coming from the MP3 decoder for playing songs.
The audio bitstream coming from the MCU for outputting voice or sounds.
AUDCON0.0
HLR
Clock Generator
16
16
AUBUSY
AUDSTA.7
AUDSTA.6
AUDSTA.5
UDRN
SREQ
AUDCON0.1
AUDCON1.7
DSIZ
SRC
0
1
Data Converter
AUDCON0.7:3
JUST4:0
AT8xC51SND1C
AUDCON0.2
POL
0
1
SCLK
DCLK
DSEL
DOUT
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