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| 型號： | UPD178024GF |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁數(shù)： | 47/98頁 |
| 文件大小： | 467K |
| 代理商： | UPD178024GF |
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Data Sheet U14608EJ1V0DS00
47
μ
PD178024GC-051
3.4
Station Detection
A station is detected during auto tuning (auto seek and auto store memory) if the following two conditions of
receivable frequencies are satisfied:
(1) Station is detected by the S meter signal.
(2) Station is detected by an intermediate frequency.
If detection of an intermediate frequency in the AM band is not selected by initialization switch “DISAMIFC”, the
condition “(2) intermediate frequency” is ignored in detecting stations in the AM band (MW or LW), and only the
condition “(1) S meter signal” is used.
(1) Station detection by S meter signal
Stations are detected or not detected depending on the signal intensity (input voltage) of the S meter signal
input to the SM pin (pin 6) as follows, regardless of the reception bands and reception sensitivity (local/DX).
Input Voltage (V
DD
= 5.0 V)
Station Detection
128.5
÷
256
×
V
DD
or more (2.49 V or more)
Station detected
Less than 128.5
÷
256
×
V
DD
(less than 2.49 V)
Station not detected
The S meter signal is identified after the PLL is locked and 20 to 30 ms after the S meter signal has been
stabilized.
For the identification timing of the S meter signal, refer to “12. MUTE OUTPUT TIMING CHART”.
(2) Station detection by intermediate frequency
Stations are detected by measuring the intermediate frequency input to the FMIFC pin (pin 29) while the FM
band is being received, or the intermediate frequency input to the AMIFC pin (pin 28) while the AM band (MW
or LW) is being received.
The input intermediate frequency is measured three times by the internal frequency counter of the
μ
PD178024-051 for a gate open time of 4 ms. If the result of measurement is in the specific frequency range
more than two times out of three times, a station is detected.
For the range of the intermediate frequencies in which a station is detected, refer to “3.2 Reception
Frequency, Channel Space, Reference Frequency, and Intermediate Frequency”.
For the identification timing of the intermediate frequency, refer to “12. MUTE OUTPUT TIMING CHART”.
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