upd178016 Renesas Electronics Corporation., upd178016 Datasheet - Page 47

• Manufacturer Part Number: upd178016
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(2) Operation of best station
3.1.7 Automatic station selection
(1) RDS seek
(2) PI seek
(3) PTY seek
(4) TP/SK seek
(1) RDS seek
A search is made for a station by using the RDS data during seek.
The following four types of seek operations can be performed.
(a) One station is received at a time in steps <1> through <5>, below, starting from the beginning of the AF list,
(b) PI check is sequentially performed starting from the greatest of the signal meter readings measured in (a).
• RDS seek is performed if seek is performed in RDS mode.
• Only an RDS station is selected from the stations that are judged to have a station.
• RDS seek is terminated if the following condition is satisfied.
(a) If a PI code is read within 650 ms after the existence of a station has been judged.
and the signal meter reading for each station is measured.
<1> Mute is turned on, and the LPFSEL pin (pin 27) is driven high after the completion of the preceding mute
<2> A channel on the AF list is received.
<3> The signal meter reading is measured using the S • METER pin (pin 3), 1 ms after the station has been
<4> The input signal meter reading is stored into RAM.
<5> The above operation is repeated starting from <2> if there is another station to be checked.
<1> A channel on the AF list is received.
<2> The signal meter reading is measured by using the S • METER pin, 1 ms after the station has been
<3> IF is measured 5 ms after if initial setting diode FM SD/IF is jumpered.
<4> The LPFSEL pin is driven low.
<5> Reading PI is awaited.
<6> The read PI code is checked for coincidence.
<7> If the PI code coincides, that station is received, and best station is completed.
<8> If there is another station to be checked, the above operation is repeated starting from <1>.
<9> If no station is found after all the frequencies on the AF list have been searched, best station is
time (3 ms).
locked.
If the station is not locked after 40 ms, and if the signal meter reading is less than that when best station
was started, or if it is less than the best station start condition, <5> is performed.
locked.
If the station is not locked after 40 ms, and if the signal meter reading is less than that when best station
was started, or less than the best station start condition, <8> is performed.
If IF is not within the permissible range, <8> is performed.
If decoding is not performed once within 400 ms, <8> is performed.
If decoding is not performed two times within 800 ms, <8> is performed.
For an explanation of how to check the PI code, see (4) in Section 3.1.5.
terminated, and PI seek is performed.
PD178016GC-051
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