PD17012GF-058_15 Datasheet, PDF (46/94 Pages) Renesas Technology Corp – PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LW TUNER (AUTOMOBILE APPLICATION)

µPD17012GF-058
Momentary key
Description
RDMONI
The RDMONI key controls radio monitoring. It is effective in tape, CD, radio-monitor tape, or radio-
monitor CD mode. Each time the key is pressed, radio monitor mode is set or reset. In radio monitor
mode, the “RDMONI” display on the LCD panel lights.
In radio monitor mode, tuning is enabled for all bands, the radio mute function (RDMUTE pin) is switched
off, and the audio mute function (AMUTE pin) is switched on.
Radio monitor mode is reset by:
Change in the TPSET switch state
Change in the CDSET switch state
Change at the CE pin from high level to low level^Note
SCAN UP
SCAN DWN
Note When using alarm mode, always pull up the CE pin.
The SCAN UP and SCAN DWN keys are used for auto-tuning (scan operation).
Pressing the SCAN UP key ( SCAN DWN key) increases (decreases) the frequency by one channel
space and checks whether there is a broadcasting station at each reception frequency (frequency counter
and SD signal). If a broadcasting station is detected, the corresponding frequency is held for five seconds.
If no key is pressed within this hold time of five seconds, the seek operation restarts. If another broadcast-
ing station is detected, the corresponding frequency is held in the frequency counter for five seconds. This
operation is repeated (scan operation) sequentially.
The frequency display blinks at 1 Hz (with a duty cycle of 50%) during the five-second hold time. A beep
occurs at the end of the hold time.
The seek operation here is the same as one performed with the SEEK UP key.
The following table lists the operation corresponding to each key pressed during the seek operation (except
the hold time).
Key
Description
SCAN UP
SCAN DWN
If the SCAN UP key is pressed in scan-up mode, or the SCAN DWN key
is pressed in scan-down mode:
The scan operation stops, and the frequency that was selected when the scan
operation began is reselected. If the auto local function is being used, local
mode is switched.
If the SCAN DWN key is pressed in scan-up mode, or the SCAN UP key
is pressed in scan-down mode:
The operation corresponding to the pressed key begins at the frequency that is
selected when the key is pressed.
SEEK UP
MAN UP
MAN DWN
P.SCAN
The scan operation stops, and the operation corresponding to the pressed key
begins at the frequency that is selected when the key is pressed.
BAND
In radio, radio-monitor tape, and radio-monitor CD modes, the scan operation stops.
The frequency that was selected when the scan operation began (or the frequency on
hold if a broadcasting station has been detected during the scan operation) is
reselected, and the operation corresponding to the pressed key begins.
RDMONI
Either of the following operations occurs depending on what the current mode is.
(1) In radio-monitor tape and radio-monitor CD modes
The scan operation stops. The frequency that was selected when the scan
operation began (or the frequency on hold if a broadcasting station has been
detected during the scan operation) is reselected, and the operation corre-
sponding to the pressed key begins.
(2) In radio mode
The seek operation continues, and the key becomes an ineffective key.
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