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參數(shù)資料
| 型號： | UPD17071 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH PLL FREQUENCY SYNTHESIZER CONTROLLER FOR PORTABLE FM/AM RADIO AND TV |
| 中文描述： | 4位單片機與鎖相環(huán)頻率合成器控制器的便攜式調(diào)頻/調(diào)幅廣播電視 |
| 文件頁數(shù)： | 29/48頁 |
| 文件大?。?/td> | 296K |
| 代理商： | UPD17071 |
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μ
PD17071GB-012
29
2.6 Key Lock Function
The key lock function is to lock the momentary keys and invalidate key operations.
The keys are locked by input to the KEYLOCK pin (pin 14).
When the input to the KEYLOCK pin is low, the keys can also be locked by a key operation.
(1) Locking keys by input to KEYLOCK pin (pin 14)
The momentary keys can be locked by input to the KEYLOCK pin.
The operation of the momentary keys can be manipulated as follows by the pin input.
High-level input
Locks keys and invalidates all key operations.
Also invalidates the key operation to unlock the keys.
Low-level input
All the keys perform normally when the keys are pressed.
At this time, the keys can be locked or unlocked by a key operation.
(2) Locking keys by key operation
The keys can be locked or unlocked by a key operation when the input to the KEYLOCK pin (pin 14) is low. If
the input to the KEYLOCK pin is high, however, the locked keys cannot be unlocked by a key operation.
The momentary keys are locked by performing the following key lock operation.
When the keys are locked, they are unlocked when the key lock operation is performed again.
When the keys are locked, all key operations other than that to unlock the key is invalid.
The following key lock operation is performed, depending on initialization.
When initialization diode switch STOPSEL = 0
Press the
key and then the
When initialization diode switch STOPSEL =1
Press the
key and then the
ALARM
key twice.
key twice.
STOP
MODE
MODE
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| UPD17071GB-012 | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH PLL FREQUENCY SYNTHESIZER CONTROLLER FOR PORTABLE FM/AM RADIO AND TV |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17071GB-012 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH PLL FREQUENCY SYNTHESIZER CONTROLLER FOR PORTABLE FM/AM RADIO AND TV |
| UPD17071GB-012-1A7 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH PLL FREQUENCY SYNTHESIZER CONTROLLER FOR PORTABLE FM/AM RADIO AND TV |
| UPD17072 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM |
| UPD17072GB | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM |
| UPD17072GB-XXX-1A7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
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