Atmel AT89C51SND1 - Manual (Page 7)

Overview
AT89C51SND1 Reference Design User Guide 2-5
4207B–MP3–04/07
Figure 2-3. User Interface Overview
Each LED may be:
OFF
Flashing (ON during less than 1 second and only one time)
Slow blinking (continuously)
Fast blinking (continuously)
ON
microphone
headphone
connector
Play/Pause
ON (Pwr)
LED n°1
LED n°2
LED n°3
LED n°4
AT89C51SND1
Function (Func)
USB connector
Next/Plus
Previous/Minus