PD178016GC-051_15 Datasheet, PDF (33/96 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
SEL/LOUD This key acts as the loudness ON/OFF key when it is held down for two seconds. When it is released within
two seconds, this key selects the electronic volume control function.
(1) Selecting the electronic volume control function
Each time this key is pressed to select the electronic volume control function, the mode changes as
illustrated below.
If initial setting diode FAD is jumpered, fader mode cannot be used.
Normal Volume
5 seconds
Bass
Treble
Balance
Fader
TAPE
TP/SK
Each time the key is pressed, one of the above modes is set for five seconds. In each electronic
volume control mode, adjustment can be made by using the VOL UP or VOL DOWN key.
For details, refer to the description of the VOL UP and VOL DOWN keys.
The volume can be adjusted in normal display mode.
In each of the above modes, “VOL”, “BAS”, “TRE”, “BAL”, or “FAD” and the set value are displayed.
After five seconds, normal display mode is restored.
(2) Loudness ON/OFF setting
When loudness mode is ON, LCD indicator “LOUD” appears.
At this time, the LOUD pin (pin 48) outputs a high level signal.
The volume control display is cleared when the system is started by pressing the POWER key.
Loudness mode is off in the initial state when the power is first applied.
(1) In radio/CD changer mode
This key is used to select tape mode.
(2) In tape mode
This key switches the tape side between A and B.
This key is used to turn ON/OFF traffic information interrupt enable mode (TP/SK mode). This key is valid in
power-on mode. While an AM band is being received, however, presing this key causes the FM1 band to be
selected.
TP/SK mode is turned ON/OFF for each band (FM1, FM2, and FM3).
• ^{TP/SK mode ON/OFF setting}
If the device is tuned to an FM band station, this key is valid even in CD changer/tape mode. When TP/
SK mode is selected, LCD indicator “TP/SK” appears.
In TP/SK mode, auto-seek detects traffic information stations only.
While TP/SK mode is ON, the operations performed are as follows.
• While traffic information is being received
In radio mode, the SK MUTE pin (pin 19) outputs a high level signal.
The TA/DK pin (pin 18) outputs a low level signal.
In CD changer/tape mode, radio mode is selected, and traffic information is output.
• While traffic information is not being received
In radio mode, the SK MUTE pin (pin 19) outputs a low level signal.
The TA/DK pin (pin 18) outputs a high level signal.
TP/SK mode is OFF in the initial state after power is first applied.
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