PD178016GC-051_15 Datasheet, PDF (46/96 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER WITH BUILT-IN PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR AUTOMOTIVE FM/MW/LW RADIO APPLICATIONS

µPD178016GC-051
<3> If an RDS station with priority 1 cannot be received in <1> and <2> above, stations with priority 2 are
received at III, IV, and V, and the signal meter reading of each station is measured.
<4> The measured signal meter readings are sorted, starting from the greatest reading.
<5> IF and PI are checked in the order of the sorted signal meter readings, at IV, VII, and VIII.
If no station having priority 2 is found, and if the signal meter reading unacceptable in <3>, <6> is
performed. If the signal meter reading is acceptable in <3>, the operation is completed when the AF
operation next fails. Subsequently, <6> is performed by the next AF operation.
<6> A station having priority 3 is checked in the same manner as a station having priority 2.
<7> It is assumed that the AF operation has been successful when PI is judged as being acceptable, after
which the AF operation is completed.
Figure 3-3. Single-Station AF Operation
I
II
III
IV
V
VI
VII VIII
MUTE pin
Single-station AF starts
Single-station AF completed
(b) All-station AF operation
Stations are sequentially received by turning mute on/off once, until a station for which reception is
satisfactory is found.
All the frequencies in the AF list are checked. If a station for which reception is satisfactory cannot be found,
it is assumed that AF operation has failed, and the AF operation is completed.
Example Where one station has priority 1, three stations have priority 2, and two stations have priority 3
(see Figure 3-4)
(a) <1> through <6> in the example of single-station AF operation are successively performed.
<7> It is assumed that the AF operation has been successful, and the AF operation is completed when PI
is judged as being acceptable.
Figure 3-4. All-Station AF Operation
I
II
III
IV
V
VI VII VIII
MUTE pin
All-station AF starts
All-station AF completed
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