PD17012GF-058_15 Datasheet, PDF (43/94 Pages) Renesas Technology Corp – PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LW TUNER (AUTOMOBILE APPLICATION)

µPD17012GF-058
Momentary key
P.SCAN
Description
Auto-storage function
Broadcasting stations are searched for automatically. The frequency of a detected station is written
to a preset memory. A method used to detect a station is determined according to the states of the
ENAMIF and ENFMIF initial setting diodes. A broadcasting station search begins at the frequency
being currently received and is performed through the frequencies in the ascending order.
When a station is detected, its frequency is written to a preset memory.
For the voltage with SD, see the description of the SD in Chapter 1.
The auto-storage operation varies depending on the state of the AUTOLOC initial setting diode as
follows:
(1) When AUTOLOC = 0 (with no auto local function):
The auto-storage function varies depending on which mode has been selected, local or DX, when the
function begins.
(a) If DX mode has been selected when the auto-storage function starts:
A search beings at the frequency being currently received and continues in the ascending order of
the frequency. When all frequencies are searched through, the search operation ends. If the
P. SCAN key is pressed during the search operation, the auto-storage operation ends, and the
frequency selected when the auto-storage operation began is received.
When all frequencies are searched through, if at least one station is detected, the contents of the
preset memories are updated, and the preset scan begins at the M1 preset memory.
How the contents of the preset memories are updated varies depending on the number of stations
detected.
If six or more stations are detected:
If six or more stations are detected, six stations with a higher SD input are selected and
written to the preset memories. A lower frequency is written to a lower-numbered preset
memory.
If less than six stations are detected:
If less than six stations are detected, lower frequencies are written to lower-numbered preset
memories. The contents of a preset memory will not be changed if there is no frequency
corresponding to it.
(b) If local mode has been selected when the auto-storage function starts:
A search begins in local mode at the frequency being currently received and continues in the
ascending 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 operation ends.
Pressing the P. SCAN key during the search operation stops the auto-storage operation, and
causes the frequency selected when the auto-storage memory 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 memories 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, six stations with a higher SD input are selected and
written to the preset memories. A lower frequency is 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.
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