AT89C51SND1C-ROTUL Atmel, AT89C51SND1C-ROTUL Datasheet - Page 78

• Manufacturer Part Number: AT89C51SND1C-ROTUL
• Description: IC 8051 MCU FLASH 64K MP3 80TQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND1C-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 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
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

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