UPD65 NEC [NEC], UPD65 Datasheet - Page 27

• Manufacturer Part Number: UPD65
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC [NEC]

7. POC CIRCUIT
time of battery replacement.
The POC circuit monitors the power supply voltage and applies an internal reset in the microcontroller at the
Cautions 1. There are cases in which the POC circuit cannot detect a low power supply voltage of less
2. Clock oscillation is stopped by the resonator due to low power supply voltage before the
3. In order to prevent malfunction, be sure to input a low level to more than one of pins K
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.
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.
K
I3
when POC is released due to supply voltage startup).
Data Sheet U14380EJ2V0DS00
PD64A, 65
I0
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