AT80C51SND1C-ROTUL Atmel, AT80C51SND1C-ROTUL Datasheet - Page 78
AT80C51SND1C-ROTUL
Manufacturer Part Number
AT80C51SND1C-ROTUL
Description
IC MCU FLASH MP3 DECODER 80-TQFP
Manufacturer
Atmel
Series
80Cr
Datasheet
1.AT80C51SND1C-ROTIL.pdf
(213 pages)
Specifications of AT80C51SND1C-ROTUL
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
44
Program Memory Type
ROMless
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.3 V
Data Converters
A/D 2x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
80-TQFP, 80-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
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Figure 14-6. MP3 Mode Audio Configuration Flow
14.8
Figure 14-7. Voice or Sound Mode Audio Flows
Note:
14.9
78
Voice or Sound Playing
1. An under-run occurrence signifies that C51 core did not respond to the previous sample request interrupt. It may never
Registers
AT8xC51SND1C
occur for a correct voice/sound generation. It is the user’s responsibility to mask it or not.
Program Audio Clock
Voice/Song Mode
Enable DAC System
Configure Interface
JUST4:0 = XXXXXb
Configuration
DUP1:0 = XX
AUDEN = 1
DSIZ = X
HLR = X
POL = X
Clock
In voice or sound playing mode, the operations required are to configure the PLL and the audio
interface according to the DAC selected. The audio clock is programmed to generate the 256·Fs
or 384·Fs as for the MP3 playing mode. The data flow sent by the C51 is then regulated by inter-
rupt and data is loaded 4 Bytes by 4 Bytes. Figure 14-7 shows the configuration flow of the audio
interface when in voice or sound mode.
Table 85. AUDCON0 Register
AUDCON0 (S:9Ah) – Audio Interface Control Register 0
JUST4
Set MSREQ & MUDRN
Load 8 Samples in the
7
Enable Interrupt
Program Audio Clock
Wait for DAC
Select Audio
Audio Buffer
Enable Time
Configure Interface
JUST4:0 = XXXXXb
EAUD = 1
Configuration
SRC = 1
MP3 Mode
DSIZ = X
HLR = X
POL = X
SRC = 0
JUST3
6
1
JUST2
5
Enable Data Request
Enable DAC System
DAC Set-up Time
Load 4 Samples in the
AUDEN = 1
DRQEN = 1
Service Routine
Sample Request?
Audio Interrupt
JUST1
Wait For
Clock
Audio Buffer
4
SREQ = 1?
JUST0
3
Under-run Condition
POL
2
DSIZ
1
1
4109L–8051–02/08
HLR
0
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