timing questions with different oscillators

I was wondering if anyone could maybe explain to me how the micro determines a specific time with different oscillator speeds. Right now I can determine that if im using a 4Mhz internal oscillator and I want to use the PAUSE command, to get a one second delay I simply say PAUSE 1000. But I would like to use the 125Khz internal oscillator of the PIC12F683 and I can't figure out the math to get specific delays using the pause command. Does anyone know the math, it will be very helpful for future projects.

Unless redefined, the default OSC speed is 4MHz. If you use a 125kHz Xtal instead of 4MHz, then you can adjust by the ratio

4,000,000/125,000=32

For example:
With a 4MHz Xtal a one second pause would be

Code:

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PAUSE 1000

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With a 125kHz Xtal, a one second pause (approx) would be

Code:

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PAUSE 31        ' =1000/32

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