PD17012GF-058_15 Datasheet, PDF (50/94 Pages) Renesas Technology Corp – PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LW TUNER (AUTOMOBILE APPLICATION)

µPD17012GF-058
Momentary key
Description
SEEK UP
The SEEK UP key is used for auto-tuning (seek operation).
Pressing the SEEK UP key increases the frequency by one channel space and checks whether there is a
broadcasting station at each reception frequency (by a method determined depending on the states of the
ENAMIF and ENFMIF initial setting diodes). If a broadcasting station is detected, the seek operation ends.
The seek operation performed varies with the state of the AUTOLOC initial setting diode as follows:
(1) When AUTOLOC = 0 (with no auto local function):
A search operation begins at the frequency currently being received.
The search operation continues in local or DX mode whichever has been selected when the search
operation starts, until a station is detected.
(2) When AUTOLOC = 1 (with an auto local function):
A search operation begins at the frequency being currently received in local mode. When all frequen-
cies are searched through in local mode, a search operation is switched to DX mode and continues
until a station is detected. If the SEEK UP key is pressed in local mode, DX mode is selected, and a
search operation restarts with the same frequency as for the previous search. If the SEEK UP key is
pressed during a search in DX mode, the search operation ends, and the frequency at which the
search operation began is selected.
When using the SEEK UP key, set the AUTO500 initial setting diode to 0. Setting it to 1 disables the
SEEK UP key.
The SEEK UP key functions during the search operation as follows:
Key
Description
SEEK UP
When the SEEK UP key is pressed in seek-up mode, the seek operation stops,
and the frequency at which the search operation began is selected. If the auto
local function is being used when the key is pressed, local mode is switched.
MAN UP
MAN DWN
One of the following operations occurs depending on the state of the AUTO500
initial setting diode.
(1) When AUTO500 = 0:
A manual tuning operation begins at the frequency that is in the frequency
counter when the key is pressed.
(2) When AUTO500 = 1:
If the MAN UP key is pressed in seek-up mode, the seek operation stops,
and the frequency that was selected when the seek operation began is
reselected. If the auto local function is being used, local mode is switched.
SCAN UP
SCAN DWN
P.SCAN
The seek operation stops, and the operation corresponding to the pressed key
begins at the frequency that was selected when the key was pressed.
BAND
In radio, radio-monitor tape, and radio-monitor CD modes, the seek operation
stops. The frequency that was selected when the seek operation began is
reselected, and the operation corresponding to the pressed key begins.
RDMONI
Either of the following operations occurs according to what the current mode is.
(1) In radio-monitor tape and radio-monitor CD modes
The seek operation stops. The frequency that was selected when the seek
operation began is reselected, and the operation corresponding to the pressed
key begins.
(2) In radio mode
The seek operation continues, and the key becomes an ineffective key.
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