FCMEN is the Clock FailSafe Monitor for EXTOSC. If your crystal oscillator fails, FCMEN will revert to INTOSC, for safety sake. If you aren't running EXTOSC, you don't need FCMEN. It probably doesn't hurt having it on using INTOSC, though.
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Re: PIC16F15355 config setting to work on internal OSC with clock 4MHz
FCMEN is the Clock FailSafe Monitor for EXTOSC. If your crystal oscillator fails, FCMEN will revert to INTOSC, for safety sake. If you aren't running EXTOSC, you don't need FCMEN. It probably doesn't hurt having it on using INTOSC, though.
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