How to use a 20 MHz resonator on a 16F688

[Thomas Williams]

Question: what are the settings to fire up a 20 MHz resonator instead of the onboard clock?

right now I have the OSCCON = &70 for 8 Mhz but am missing the documentation where there is a 20 MHZ switch?

thanks for andy help.

PS how would you verify a 20 MHz operation being functional. which pin to verify with ocilloscope. thanks