upd178016 Renesas Electronics Corporation., upd178016 Datasheet - Page 39

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

3.1.5 AF (Alternative Frequency)
broadcast.
having the same PI code and the frequency is changed (AF operation).
(1) Judging the start of AF operation
Decode state
Number pending
40 or greater
35 or greater and less than 40
30 or greater and less than 35
15 or greater and less than 30
Less than 15
The same contents as those of the RDS station currently being received are used as the code of the frequency
The read AF code is stored into RDS memory.
METHOD A and METHOD B are supported.
If the reception of the RDS station currently being received deteriorates in RDS mode, a search is made for a station
o: AF operation does not start.
Note Select single-station or all-station AF operation by using initial setting diode AFALL.
: All-station AF operation starts.
: Single-station/All-station AF operation starts.
(a) AF operation start condition
(b) Determining the signal meter reading range
The AF operation start conditions are listed below.
Determine the ranges (ranges A, B, and C, and range pending) of the signal meter readings by means of
the following procedure:
<1> Read the signal meter reading from the S • METER pin (pin 3) every 100 ms and calculate the average
<2> After the frequency has been changed, processing <3> below is not performed. The range remains
<3> Determine the signal meter reading ranges illustrated below, based on the calculated average of the
Signal meter reading
of the last five signal meter readings.
pending until five signal meter readings have been obtained.
signal meter readings.
Range pending
o
o
o
o
o
o
Note
Range A
o
o
o
Range B
o
o
o
o
PD178016GC-051
Range C
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