PD17012GF-058_15 Datasheet, PDF (36/94 Pages) Renesas Technology Corp – PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LW TUNER (AUTOMOBILE APPLICATION)

µPD17012GF-058
Momentary key
Description
M1
In radio mode, these keys are used to access a preset memory and control whether to enable writing to it.
M2
In tape mode, the M5 keys are used for a tape function (MTL) key depending on the settings of the
M3
KTAPE initial setting diode.
M4
M5
(1) In radio, radio-monitor tape, and radio-monitor CD modes
M6
The M1 to M6 keys are used to access a preset memory and control whether to enable writing to it.
Each key can be set to the FM1, FM2, FM3, MW1, MW2 and LW bands (up to six bands) separately.
The functions of these keys are as follows:
Description
Keeping one of the M1 to M6 keys pressed for at least 2 seconds writes a frequency to the
preset memory corresponding to the pressed key.
When writing to the preset memory is completed, the radio mute signal is output as acknowl-
edgment.
Example
RDMUTE
pin output
15 ms
2 sec
Beep
40 ms
300 - 400 ms
Key
operation
M1
to
M6
keys are on
Display Frequency or
clock display
The preset memory number corresponding to the
pressed key is displayed.
The frequency previously received is displayed.
When the frequency recorded in the currently selected preset memory is being received,
pressing the key corresponding to this preset memory does not trigger any operation except
during clock display. During clock display, pressing the key not only generates a beep but also
switches to the frequency display. Pressing the key, however, does not generate the radio
mute signal.
During the seek operation, pressing the key immediately accesses the preset memory (without
waiting 2 seconds).
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