Atmel AT89C51SND1 - Manual (Page 9)

Overview
AT89C51SND1 Reference Design User Guide 2-7
4207B–MP3–04/07
2.5 Alternate
Functions When a mode is validated, the corresponding LED blinks slowly (except for USB mode,
LED n°3 blink quickly when mode is activated and more slowly during transfer). Alter-
nate functions regarding this mode are then accessible using the Function button. One
LED blinking quickly is dedicated for each alternate function.
For Song Mode, alternate functions are:
LED n°1: Volume Control
LED n°2: Bass Control
LED n°3: Medium Control
LED n°4: Treble Control
LED n°2,3,4: Bass Boost Control
For Voice Mode, alternate functions are:
LED n°1: Volume Control
LED n°2: Stop and wait for Recording confirmation (to be validated by Play/Pause)
For other modes, there exist no alternate functions at the present time.
To adjust the controls, press Previous/Minus (to decrease) or Next/Plus (to increase)
the control level. A bar graph lights up for the corresponding control when one of these
buttons are pressed and during the adjustment, the control ranges from all LED OFF
(minimum level) to all LED ON (maximum level).
If no buttons are pressed for 3 seconds, the alternate functions setup ends and the LED
corresponding to the current mode blinks slowly (Play information).
2.6 Special
Information Normally only one LED is ON or blinking at the same time. Exceptions are:
Change of Music Track: all LEDs flash one time
Start-up/Power ON: all LEDs flash one time
Voice Record: LEDs 1, 3 and 4 blink
Software ISP mode: LEDs 1 and 4 ON
Bar graph for the selected Control: from 0 to 4 LEDs ON
Error report: all LEDs are ON
Note: A possible error is that the mass storage system is not formatted. If this is the
case, press the Function button until Format Mode is selected and validate this
mode with the Play/Pause button.
All LEDs are off during:
Format process of mass storage
Initialization
Power OFF