PD178016GC-051_15 Datasheet, PDF (50/96 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
(2) PI seek
• PI seek is performed if best station has failed in RDS mode.
• Only an RDS station having the same PI code as that of the RDS station being received before best station
operation is started is selected from the stations that are judged to have a station.
• PI seek is terminated if all the following conditions are satisfied.
(a) If a PI code is read within 650 ms after the existence of a station has been judged.
(b) If the PI code is compared and coincides.
• If an RDS station having the same PI code is not found after the band has been subject to one round of
searching, the frequency to which the system was tuned before the operation was started is received.
(3) PTY seek
• PTY seek is performed when seek is performed in PTY mode.
• Only an RDS station from which the same PTY code as PTY displayed before the start of PTY seek is selected
from the stations that are judged to have a station.
• PTY seek is completed if all the following conditions are satisfied.
(a) If a PTY code is read within 650 ms after the existence of a station has been judged.
(b) If the PTY code is compared and coincides.
• If an RDS station having the same PI code is not found after the band has been subject to one round of
searching, the frequency to which the system was tuned before the operation was started is received.
(4) TP/SK seek
• TP/SK seek is performed if seek is performed in TP/SK mode.
• Only an RDS station from which TP = 1 is read is selected from all the stations that are judged to have a station.
• TP/SK seek is terminated if all the following conditions are satisfied.
(a) If TP code is read within 650 ms after existence of a station has been judged.
(b) TP code = 1
• If RDS mode is off, however, the station for which the SK pin (pin 65) is low is also selected.
If the TP code is read within 1 150 ms of the existence of a station having been judged, TP/SK seek is terminated.
3.1.8 Emergency broadcasting reception
When emergency broadcasting is started, radio mode is selected, and the emergency broadcast is received. This
section explains how emergency broadcasting is received.
(1) If TP/SK mode is off in CD changer/tape mode
<1> The frequencies of the most-recently selected band, from the minimum frequency to the maximum
frequency, are searched, and that RDS station for which reception is strongest is selected. When the AM
band was selected last, FM1 is received.
<2> Search is performed again if the state in which the PTY code cannot be decoded persists for 30 seconds
when <1> is being received.
<3> If the PTY code indicates emergency broadcasting (PTY = 31) in the state in which the PTY code can be
decoded, radio mode is selected, and the “ALARM” indicator blinks.
<4> Upon the completion of emergency broadcasting, the original sound is restored (when the PTY code has
been changed, or 30 seconds after the PTY code can no longer be read).
(2) If TP/SK mode is on
<1> The most-recently selected channel of the most-recently selected band is received. When the AM band
was selected last, FM1 is received.
<2> If the PTY code indicates emergency broadcasting (PTY = 31) in the state in which the PTY code can be
decoded, radio mode is selected, and the “ALARM” indicator blinks.
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