PD17012GF-058_15 Datasheet, PDF (41/94 Pages) Renesas Technology Corp – PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LW TUNER (AUTOMOBILE APPLICATION)

µPD17012GF-058
Momentary key
Description
MUTE
POWER
The MUTE key controls the electronic volume control mute function. Pressing the MUTE key in a mode
other than mute mode selects mute (silent) mode. In mute mode, the volume value is displayed, and the
display is caused to blink.
The mute function is reset under the following conditions.
When an effective key other than the DISP key is pressed
When the mode is changed
When a station is detected during a seek or scan operation, with the MUTE pressed.
When the MUTE key is pressed during muting
The POWER key is used to control the power-on/off of the radio in momentary key mode. It is effective
when the IGNITION pin is at a high level. Pressing this key inverts the output of the POWER pin.
When the POWER pin output is set to low (the power is turned off), the tape recorder, CD player and radio
are forced to be turned off even when they have been in the power-on state. In this case, they are turned
off with or without clock display, according to whether they were in clock mode or non-clock mode.
The power-on mode varies as follows according to the state of the RDSET, TPSET, and CDSET switches.
Mode
Radio mode
Tape mode
CD mode
REDSET
ON
ON/OFF
ON/OFF
TPSET
OFF
ON
ON/OFF
CDSET
OFF
OFF
ON
Caution
At the initial power-on, the POWER pin outputs the high level. When the level of IGNITION
pin changes from low to high, the POWER pin outputs the level which have been set
before IGNITION becomes low, until the primary power supply is turned off.
P.SCAN
This key functions as a preset scan and auto-storage key. The operation triggered by the key varies
depending on the state of the DISAMEMO initial setting diode.
(1) When DISAMEMO = 0 (with the auto-storage function):
The operation varies depending on the timing at which the key is operated.
(a) If the key is released within 2 seconds:
The preset scan operation begins immediately when the key is released.
(b) If the key is pressed for at least 2 seconds:
The auto-storage operation begins when 2 seconds elapse.
(2) When DISAMEMO = 1 (without the auto-storage function):
The preset scan operation begins immediately when the key is pressed.
The preset scan and auto-storage functions are described below.
Preset scan operation
The contents of each preset memory are called for 5 seconds each time automatically.
If a frequency other than those in the preset memories is being received, calling begins at M1. If
a frequency recorded in a preset memory is being received, calling begins at the preset memory
numbered one higher than that preset memory (for example, at the M4 preset memory if a
frequency recorded in the M3 preset memory is being received). This operation is illustrated
below.
Example If the FM1 band is being received:
FM1
M1 M2 M3 M4 M5 M6
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