AT83SND2CMP3B datasheet(79/241 Pages) ATMEL

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4341F–MP3–03/06

AT8xC51SND2C/MP3B

Reset Value = 1011 0010b

Table 14-5.

AUDSTA Register

AUDSTA (S:9Ch Read Only) – Audio Interface Status Register

Reset Value = 1100 0000b

DRQEN

MP3 Decoded Data Request Enable Bit

Set to enable data request to the MP3 decoder and to start playing song.

Clear to disable data request to the MP3 decoder.

5MSREQ

Audio Sample Request Flag Mask Bit

Set to prevent the SREQ flag from generating an audio interrupt.

Clear to allow the SREQ flag to generate an audio interrupt.

MUDRN

Audio Sample Under-run Flag Mask Bit

Set to prevent the UDRN flag from generating an audio interrupt.

Clear to allow the UDRN flag to generate an audio interrupt.

Reserved

The value read from this bit is always 0. Do not set this bit.

2 - 1

DUP1:0

Audio Duplication Factor

Refer to Table 14-2 for bits description.

AUDEN

Audio Interface Enable Bit

Set to enable the audio interface.

Clear to disable the audio interface.

543

210

SREQ

UDRN

AUBUSY

Bit Number

Bit

Mnemonic

Description

7SREQ

Audio Sample Request Flag

Set in C51 audio source mode when the audio interface request samples (buffer half

empty). This bit generates an interrupt if not masked and if enabled in IEN0.

Cleared by hardware when samples are loaded in AUDDAT.

UDRN

Audio Sample Under-run Flag

Set in C51 audio source mode when the audio interface runs out of samples (buffer

empty). This bit generates an interrupt if not masked and if enabled in IEN0.

Cleared by hardware when samples are loaded in AUDDAT.

AUBUSY

Audio Interface Busy Bit

Set in C51 audio source mode when the audio interface can not accept more sample

(buffer full).

Cleared by hardware when buffer is no more full.

4 - 0

Reserved

The value read from these bits is always 0. Do not set these bits.

Bit Number

Bit

Mnemonic

Description

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