External Oscillator frequency for 16f689

[yrb]

Hi

I would like to know if 16f689 supports external Oscillator frequency
6 MHz for external Oscillator frequency 4Mhz to be used in function:

[PCM programmer]

The setup_oscillator() function is used for the internal oscillator,
not external. The internal oscillator supports 4 MHz and 8 MHz, and
other frequencies but not 6 MHz. If you want 6 MHz, then use an
external crystal (with 22pf capacitors) and use HS in the #fuses.
Don't use setup_oscillator() for an external crystal.