Internal osc with xtal fitted

[RGV250]

Hi,
I have an Amicus18 board where the external xtal is soldered in place. I would like to try a program that uses the internal osc, if I set FOSC = INTIO67  will the external xtal affect anything or will it just be ignored. I do not need to use the pins.

Regards,
Bob

[John Lawton]

Those port lines will act as I/O so there is some extra capacitive load on those lines but you can ignore that if not using them.

Interestingly I have used the same config setting but have not managed to get the PLL working so I'm stuck at 16MHz max internal osc speed.

John

[RGV250]

Hi John,
In my example it is only running at 8mhz, have you set CONFIG1H bit 4 (PLLCFG)?

Bob