My understanding is that "FCMEN_ON" is only needed with an external oscillator. If it fails, the PIC reverts to INTOSC.
Also, if you just configure your OSCCON1 for 32 MHZ, you can then select 4 MHZ in OSCFRQ.
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Re: PIC16F15355 config setting to work on internal OSC with clock 4MHz
My understanding is that "FCMEN_ON" is only needed with an external oscillator. If it fails, the PIC reverts to INTOSC.
Also, if you just configure your OSCCON1 for 32 MHZ, you can then select 4 MHZ in OSCFRQ.
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