Protocol Frame Description

AT83SND2CMP3 frame response is SYSTEM_ACK frame.

Table 5-4 .SYSTEM_GET_STATUS Frame Format

 

 

Protocol

 

 

 

Frame Start

Channel

Command

Data Length

Data

CheckSum

 

 

 

 

 

 

7Eh

Not used,

02h

00h

No

Yes

FFh

 

 

 

 

 

 

 

 

 

 

 

SYSTEM_AUDIO_OUTPUT Command

Select Player Audio Output:

„Headset

„Power Amplifier

The default configuration is Headset and Power Amplifier activated after reset.

Table 5-5 .SYSTEM_AUDIO_OUTPUT Frame Format

 

 

Protocol

 

 

 

Frame Start

Channel

Command

Data Length

Data

CheckSum

 

 

 

 

 

 

7Eh

Not used,

03h

01h

AUDIO_OUTPUT

Yes

FFh

(1 byte)

 

 

 

 

 

 

 

 

 

 

Table 5-6 .AUDIO_OUTPUT Format

 

AUDIO_OUTPUT Parameter

Audio Output

Value (1 byte)

 

 

None

00h

 

 

Headset

01h

 

 

Reserved

02h

 

 

Headset and Power

03h

Amplifier

 

 

 

Note: The Audio output “None” will power off the Audio Headset capacitors (from VDD/2 to 0V). The Audio output None shall be used only before a hardware reset to avoid any ‘plop’ on audio headset.

SYSTEM_SELECT_MEMORY Select Memory and mount file system FAT on memory. Player response is Command SYSTEM_ACK frame.

When FAT is installed on selected memory, player’s status byte is updated with:

„FNA set (File name available, Table 5-1 . Player STATUS Description). This flag is set when FAT install is OK. Then Player is ready to process the ‘PLAY’ command.

„MERROR set (Memory Error, Table 5-1 . Player STATUS Description). This flag is set when memory initialization is KO or card is not present (for memory card slot).

„MNF is set (Memory not formated, Table 5-1 . Player STATUS Description). This flag is set when selected memory is not formated.

AT83SND2CMP3 User Guide

5-29

7525A–MP3–07/05