Chapter 15 Power-On-Clear Circuit; Functions Of Power-On-Clear Circuit - NEC 78K0S/KA1+ Preliminary User's Manual

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15.1 Functions of Power-on-Clear Circuit

The power-on-clear circuit (POC) has the following functions.
• Generates internal reset signal at power on.
• Compares supply voltage (V
when V
DD
Cautions 1. If an internal reset signal is generated in the POC circuit, the reset control flag register
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2. Because the detection voltage (V
Remark This product incorporates multiple hardware functions that generate an internal reset signal. A flag that
indicates the reset cause is located in the reset control flag register (RESF) for when an internal reset
signal is generated by the watchdog timer (WDT) or low-voltage-detection (LVI) circuit. RESF is not
cleared to 00H and the flag is set to 1 when an internal reset signal is generated by WDT or LVI.
For details of RESF, see CHAPTER 14 RESET FUNCTION.
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CHAPTER 15 POWER-ON-CLEAR CIRCUIT

) and detection voltage (V
DD
< V .
POC
(RESF) is cleared to 00H.
voltage in the range of 2.2 to 5.5 V.
Preliminary User's Manual U16898EJ1V0UD
= 2.1 V ±0.1 V), and generates internal reset signal
POC
) of the POC circuit is in a range of 2.1 V ±0.1 V, use a
POC