AT80SND1C-ROTIL datasheet(77/210 Pages) ATMEL

77 / 210 page

AT8xC51SND1C

4109E–8051–06/03

Figure 53. MP3 Mode Audio Configuration Flow

Voice or Sound Playing

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 interrupt and data is loaded 4 Bytes by 4 Bytes. Figure 54

shows the configuration flow of the audio interface when in voice or sound mode.

Figure 54. Voice or Sound Mode Audio Flows

Note:

1. An under-run occurrence signifies that C51 core did not respond to the previous sample request interrupt. It may never

occur for a correct voice/sound generation. It is the user’s responsibility to mask it or not.

MP3 Mode

Configuration

Configure Interface

HLR = X

DSIZ = X

POL = X

JUST4:0 = XXXXXb

SRC = 0

Program Audio Clock

Enable DAC System

Clock

AUDEN = 1

Wait For

DAC Set-up Time

Enable Data Request

DRQEN = 1

Select Audio

SRC = 1

Voice/Song Mode

Configuration

Configure Interface

HLR = X

DSIZ = X

POL = X

JUST4:0 = XXXXXb

DUP1:0 = XX

Program Audio Clock

Enable DAC System

Clock

AUDEN = 1

Wait for DAC

Enable Time

Load 8 Samples in the

Audio Buffer

Enable Interrupt

Set MSREQ & MUDRN1

EAUD = 1

Audio Interrupt

Service Routine

Under-run Condition

Load 4 Samples in the

Audio Buffer

Sample Request?

SREQ = 1?

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