Protocol Frame Description

Table 5-11 .SYSTEM_WAKEUP command

Controller_Rx

_ACK

 

SYSTEM

Controller_Tx

1ms

(connected to

_POWERDOWN

 

SYSTEM

INT0)

 

AT8XC51SND2

Initialization

Power Down

 

Mode

 

SYSTEM_USB_DETACH Request the Player to perform a USB detach. Command

Warning: during USB data transfer, performing a USB detach can corrupted the current data transfered on the memory.

In USB mode, the Remote Controller must check the USB_CONNECTED status bit in AT83SND2CMP3 Status byte to be informed of a manual USB detach.

Table 5-12 .SYSTEM_USB_DETACH Command Format

 

 

Protocol

 

 

 

Frame Start

Channel

Command

Data Length

Data

CheckSum

 

 

 

 

 

 

7Eh

Not used,

08h

00h

No

Yes

FFh

 

 

 

 

 

 

 

 

 

 

 

SYSTEM_USB_CONNECT SYSTEM_USB_CONNECT is a Remote Controller command to Player for asking an Command USB Connection.

Table 5-13 .SYSTEM_USB_CONNECT Command Format

 

 

Protocol

 

 

 

Frame Start

Channel

Command

Data Length

Data

CheckSum

 

 

 

 

 

 

7Eh

Not used,

09h

00h

No

Yes

FFh

 

 

 

 

 

 

 

 

 

 

 

SYSTEM_VOLUME_UP Master gain volume up (one step). Player response is PLAYER_VOLUME* frame.

5-32

AT83SND2CMP3 User Guide

7525A–MP3–07/05