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參數(shù)資料
| 型號(hào)： | UPD64A |
| 廠(chǎng)商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION |
| 中文描述： | 4位單片機(jī)的紅外遙控傳輸 |
| 文件頁(yè)數(shù)： | 27/64頁(yè) |
| 文件大小： | 399K |
| 代理商： | UPD64A |
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27
μ
PD64A, 65
Data Sheet U14380EJ2V0DS00
7. POC CIRCUIT
The POC circuit monitors the power supply voltage and applies an internal reset in the microcontroller at the
time of battery replacement.
Cautions 1. There are cases in which the POC circuit cannot detect a low power supply voltage of less
than 1 ms. Therefore, if the power supply voltage has become low for a period of less than
1 ms, the POC circuit may malfunction because it does not generate an internal reset signal.
2. Clock oscillation is stopped by the resonator due to low power supply voltage before the
POC circuit generates the internal reset signal. In this case, malfunction may result, for
example when the power supply voltage is recovered after the oscillation is stopped. This
type of phenomenon takes place because the POC circuit does not generate an internal reset
signal (because the power supply voltage recovers before the low power supply voltage is
detected) even though the clock has stopped. If, by any chance, a malfunction has taken
place, remove the battery for a short time and put it back. In most cases, normal operation
will be resumed.
3. In order to prevent malfunction, be sure to input a low level to more than one of pins K
I0
to
K
I3
when POC is released due to supply voltage startup).
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