Atmel AT89C51SND1 - Manual (Page 8)

Overview
AT89C51SND1 Reference Design User Guide 2-6
4207B–MP3–04/07
2.2 Quickstart This procedure allows you to quickly play an MP3 song stored in the mass storage sys-
tem. If the mass storage is empty or not formatted, see the following section regarding
MP3 upload (“USB Mode”).
4. If the player is battery powered, push the ON button. If the player is powered by
USB, plug the USB cable into your computer.
All LEDs flash to confirm the power is ON.
After a few seconds, depending of the mass storage type and size, LED n°1 is
ON: indicating Song Mode is selected.
5. Push the Play/Pause button to play the first MP3 song of the mass storage
medium.
LED n°1 blinks during music play.
6. If the player is battery powered, after 1 minute of inactivity (no music), the player
will be automatically turned off.
2.2.1 Power ON/OFF Press the ON button to power the player. Power off is automatic after one minute of
inactivity (no music, no button pressed). When the player is connected to a PC using the
dedicated USB cable, the player is powered by the USB power line and the battery is
useless (and will not be discharged). Disconnecting USB cable will automatically switch
supply to the battery without stopping the operation.
2.3 Main Functions Main functions are the first meaning of the buttons:
Play/Pause: this button means Play/Pause or Select or Record
Function: to change the current mode or alternate function
Plus/Minus: to change a music track or change a control level
ON: to power on the player using the battery
2.4 Mode Functions After power ON and initialization (step 1 of the previous section), there are 4 basic func-
tions called “modes”, assigned to a dedicated LED:
LED n°1: Song Mode, to play the MP3 files of the embedded mass storage system
LED n°2: Voice Mode, to play or record short “wav” messages (phone quality)
LED n°3: USB Mode, to upload or download files to the embedded storage system
LED n°4: Erase Mode, to format the mass storage system
By pressing the Function key sequentially, the user will switch between these modes
(mode 1, 2, 3, 4, 1...). The LED ON indicates the current mode.
To validate one of these modes, press the Play/Pause button. For instance, if LED n°1
is ON, the current mode is “Song Mode”. The Play/Pause button will start the MP3
music.