PIC12F675 at 20MHz ?? (Pic Basic Pro Compiler)

[zorgloub]

OK.
If I note that: “Since Defining an OSC value has no effect on PULSIN. The resolution always changes with the actual oscillator speed.”

What then is the true usefulness of this DEFINE OSC command?

Simply or imperatively specify in the PBP compiler the actual operating speed depending on a quartz or simply the internal oscillator.

The only configuration of the OSC fuse bits would not be enough?

I would then deduce that this command must always be placed in the program to specify the actual operating speed at PBP. Correct ?

[richard]

What then is the true usefulness of this DEFINE OSC command?

its not a command, its a compiler directive

as pointed out it is used to:-
inform the compiler what clock speed you're running at so it can adjust various internal timings. that's it nothing else

do read the manual there is a chapter on define OSC
pause command for instance

DEFINE OSC must be used in order for PBP to accurately calculate and generate code for PAUSE. If no DEFINE OSC is placed in the program, PBP will assume that the system clock will operate at 4MHz and calibrate the generated code accordingly.