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19.1 Functions of Power-on-Clear Circuit
The power-on-clear circuit (POC) has the following functions.
• Generates internal reset signal at power on.
The reset signal is released when the supply voltage (V
Caution If the low-voltage detector (LVI) is set to ON by an option byte by default, the reset signal is not
released until the supply voltage (V
• Compares supply voltage (V
when V
< V
.
DD
POC
Caution If an internal reset signal is generated in the POC circuit, the reset control flag register (RESF)
is cleared to 00H.
Remark This product incorporates multiple hardware functions that generate an internal reset signal. A flag
that indicates the reset source is located in the reset control flag register (RESF) for when an internal
reset signal is generated by the watchdog timer (WDT), low-voltage detector (LVI), or illegal
instruction execution. RESF is not cleared to 00H and the flag is set to 1 when an internal reset
signal is generated by WDT, LVI or illegal instruction execution. For details of RESF, see CHAPTER
18 RESET FUNCTION.
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CHAPTER 19 POWER-ON-CLEAR CIRCUIT
) exceeds 2.07 V ±0.2 V.
DD
) and detection voltage (V
DD
User's Manual U17854EJ9V0UD
) exceeds 1.59 V ±0.09 V.
DD
= 1.59 V ±0.09 V), generates internal reset signal
POC
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