FUJITSU F2MCTM-16LX - Manual (Page 391)

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CHAPTER 19 LOW VOLTAGE DETECTION/CPU OPERATING DETECTION RESET
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CPU operating detection circuit
It is a counter for preventing the program out of control. After it starts, it is necessary to keep clearing
regularly within the fixed time.
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Voltage comparison circuit
When the detection voltage is compared with the power-supply voltage, the output is set to "H" after the
low voltage detection.
After the power supply is turned on, it always operates.
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Low voltage/CPU operating detection reset control register (LVRC)
This register clears the low voltage/CPU operating detection reset flag and the counter of CPU operating
detection function.
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Reset factor of low voltage/CPU operating detection reset circuit
After power-supply voltages is fallen more than the detection voltages, internal reset is generated.
When the counter of CPU operating detection circuit is not cleared during the fixed time, internal reset is
generated.