PD178016GC-051_15 Datasheet, PDF (37/96 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER WITH BUILT-IN PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR AUTOMOTIVE FM/MW/LW RADIO APPLICATIONS

µPD178016GC-051
Momentary key
Description
VOL UP
VOL DOWN
(2) TEA6320
TEA6320 can be used when initial setting diode VOLSEL = 1.
(a) Volume
These keys are valid during normal/volume display.
The electronic volume control function becomes valid when the key is pressed, and the volume is
incremented or decremented in units of 2 [dB]. When the key is held down for about 0.5 seconds,
the volume is successively incremented or decremented at a rate of 2 [dB] every 0.1 seconds, until
the key is released.
The initial value when the power is first applied is VOL 22 (-24 [dB]).
Display (41 steps)
Attenuation [dB]
VOL 0
MUTE
VOL 1
-66
VOL 2
-64
...
VOL 39 VOL 40
...
8
10
(b) Bass
The bass control function is valid only in bass display mode.
This function becomes valid as soon as either of these keys is pressed, and the bass is
incremented or decremented in units of 3 [dB].
When the key is held down for about 0.5 seconds, the bass is successively incremented or
decremented at a rate of 3 [dB] every 0.3 seconds, until the key is released.
The initial value when the power is first applied is BAS 0 (0 [dB]).
Display (9 steps)
Attenuation [dB]
BAS - 4
-12
BAS - 3
-9
... BAS 0
... 0
... BAS + 3 BAS + 4
...
9
12
(c) Treble
The treble control function is valid only in treble display mode.
This function becomes valid as soon as either of these keys is pressed, and the treble is
incremented or decremented in units of 3 [dB].
When either key is held down for about 0.5 seconds, the treble is successively incremented or
decremented at a rate of 3 [dB] every 0.3 seconds, until the key is released.
The initial value when the power is first applied is TRE 0 (0 [dB]).
Display (9 steps)
Attenuation [dB]
TRE - 4
-12
TRE - 3
-9
... TRE 0
... 0
... TRE + 3 TRE + 4
...
9
12
35