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If you use the INTIO1 setting there will be a FOSC/4 output on RA6.....
If you use the INTIO1 setting there will be a FOSC/4 output on RA6.....
I think maybe you misunderstood what he typed. Port A6 is used as an output for the clock if INTIO1 is used. This will not interfere with the function of Port C6 or C7. These pins can still be used as tx/rx.