Si4844-B-DEMO
Rev. 0.1
7
Table 1. Key Function Description
Button/Mode
Time Mode
FM/AM/SW Radio Mode
Tuner Off
Tuner On
POWER/BAND
Hold Time
< 1s
None
Change between FM, AM, and SW (there
are 2 FM bands, 2 AM bands, and 8 SW
bands)
Hold Time
> 1s
Enable radio
Disable radio function and enter Time mode.
(Radio parameters will be saved to MCU)
DE/SPC
None
FM mode: Change De-emphasis, between
50 µs and 75 µs.
AM mode: Change channel space, between
9 kHz and 10 kHz.
BASS/TMR
Enter or quit time setting menu.
Decrease Bass/Treble level by 1 step.
TREBLE/AL
Enable or disable the alarm
function; enter or quit alarm
setting menu.
Increase Bass/Treble level by 1 step.
UP/VOL+
Hold Time
< 1s
In setting menu, change the
current time/alarm parameter by
one unit per each press.
In radio setting menu, change the current
parameter by one unit per each press.
In radio working mode, increase volume 1
step per each press.
Hold Time
> 1s
In setting menu, change the
current time/alarm parameter
automatically.
In radio setting menu, change the current
parameter automatically.
In radio working mode, increase volume
level automatically until at maximum.
DOWN/VOL–
Hold Time
< 1s
In setting menu, change the
current time/alarm parameter by
one unit per each press.
In radio setting menu, change the current
parameter by one unit per each press.
In radio working mode, decrease volume 1
step per each press.
Hold Time
> 1s
In setting menu, change the
current time/alarm parameter
automatically.
In radio setting menu, change the current
parameter automatically.
In radio working mode, decrease volume
level automatically until at minimum.
MONO/ST
W/N BAND
Hold Time
< 1s
None
FM/SW mode: Change band range between
wideband and narrow-band.
Hold Time
> 1s
None
FM mode: Change between forced mono
audio and ST audio
SETTING
Hold Time
< 1s
None
In radio setting menu, change the current
item by one step per each press
Hold Time
> 1s
None
Quickly return to FM working mode.
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