PD17012GF-058_15 Datasheet, PDF (44/94 Pages) Renesas Technology Corp – PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LW TUNER (AUTOMOBILE APPLICATION)

µPD17012GF-058
Momentary key
P.SCAN
Description
If less than six stations are detected in local mode and some are detected in DX mode,
resulting in a total of less than six stations being detected:
If the same station is detected in DX and local modes, the station detected in DX mode is
deleted so that the same frequency will not be written to two preset memories. The frequen-
cies of the less than six stations detected are written to the preset memories, with a lower
frequency written to a lower-numbered preset memory. The contents of a preset memory will
not be changed if there is no frequency corresponding to it.
(2) When AUTOLOC = 1 (with the local function):
A search begins in local mode at the frequency being currently received and continues in the ascend-
ing order of the frequency. When all frequencies are searched through, if six or more stations are not
detected, the search switches to DX mode and continues in it. If six or more stations are detected in
local mode, or all frequencies are searched through in DX mode, the auto-storage operations ends.
Pressing the P. SCAN key in local mode switches to DX mode, and restarts the search operation at
the frequency selected when the previous search began. Any stations detected in local mode are
made ineffective. (Stations detected in local mode are excluded during preset memory updating.)
Pressing the P. SCAN key in DX mode ends the auto-storage operation, and causes the frequency
selected when the auto-storage operation began to be received.
If six or more stations are detected in local mode, or all frequencies are searched through in DX mode,
the auto-storage operation ends. If at least one station is detected, the contents of the preset memo-
ries are updated, and the preset scan begins with the M1 preset memory.
How the contents of the preset memories are updated varies depending on the number of stations
detected, as follows:
If six or more stations are detected in local mode:
If six or more stations are detected in local mode, six stations with a higher SD input are selected
and written to the preset memories, with a lower frequency written to a lower-numbered preset
memory.
If less than six stations are detected in local mode, and some are detected in DX mode,
resulting in a total of six or more stations being detected:
Stations detected in DX mode with higher SD input levels are selected and added to the number of
stations detected in local mode so that the total becomes six. In this case, the stations detected in
local mode are excluded from those detected in DX mode.
The frequencies of the six stations are written to the preset memories, with a lower frequency
written to a lower-numbered preset memory.
If less than six stations are detected in local mode and some are detected in DX mode,
resulting in a total of less than six stations being detected:
If the same station is detected in DX and local modes, the station detected in DX mode is deleted
so that the same frequency will not be written to two preset memories. The frequencies of the less
than six stations detected are written to the preset memories, with a lower frequency written to a
lower-numbered preset memory. The contents of a preset memory will not be changed if there is
no frequency corresponding to it.
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