upd178016 Renesas Electronics Corporation., upd178016 Datasheet - Page 42

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

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(ii) When changing the tunable frequency
(iii) When power is first applied
(iv) If AF operation fails repeatedly in a tunnel
(v) If AF operation is repeatedly successful in the same region
<1> If the AF operation (where S • M reading range is A) is successful in the decode state, the frequency
<2> If the number of stations for which the AF operation succeeded is three or less within one hour when
<3> If a fault such as multipath occurs, the AF operation is immediately started even if the AF operation has
<4> The frequency recorded in <1> is cleared in the following cases:
AF operation is disabled after the frequency has been changed until the reception state is stabilized.
AF operation is disabled until reception stabilizes.
If the S • M reading range changes from A to C, and if the AF operation has failed in range C, the system
judges that the vehicle is currerntly in a tunnel.
If this judgment is made, AF operation is disabled depending on the number of times the operation has
failed, so that AF operation is not retried frequently.
The number of successive failures is cleared in the following cases:
• When the tunable frequency is changed (except during AF operation/B.S./EON operation)
• If S • M reading range is not in range C
• If AF operation/B.S./EON operation is successful
at which the operation succeeded is recorded.
<1> is repeatedly successful, it is judged that all the stations are suffering from reception abnormalities
such as multipath.
However, this judgment is not made until <1> succeeds six times in a row.
been successful; therefore, the AF operation is disabled.
• When the tunable frequency is changed (except during AF operation/B.S./EON operation)
• When the AF operation succeeds in the S • M reading range (where the S • M reading range is B or
C)
(Number of successive failures - 1)
(9 minutes MAX.)
Disable time
Disable time
Disable time
Disable time
10 seconds
3 seconds
5 seconds
60 seconds
PD178016GC-051