waitcnt

anita1984

Dear forum,
please can someone explain for me if i have waicnt (80 000+cnt) , how much time the cog is paused , i am using a _clkmode = xtal1 + pll16x with a clock of 5MHz
Thank you in advance,
Anita

potatohead

80_000 / 80_000_000 = 0.001 = 1ms (there, fixed now)

clocks / clocks_per_second = seconds

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Post Edited (potatohead) : 9/27/2009 8:57:39 PM GMT

anita1984

thank you very much

potatohead

You are welcome. -->and welcome to the forum, BTW. We've a good crowd. Don't think twice about jumping right on in!

Was funny, I had just sorted out waitcnt a few minutes before checking into see your query. Perfect.

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jazzed

@Doug, I respectfully disagree.
Each cnt tick in the case of xtal 5MHz and PLL16 is 12.5ns or 80MHz.
So, the calculation is 80_000/80_000_000Hz = ~1ms or waitcnt(clkfreq/1000+cnt).
There is some fudge factor in it because of Spin performance of course.

Yes, welcome new forum participant anita1984.

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potatohead

Oh Smile. Yep, I totally didn't plug in the actual clock and just took the xtal frequency.

Thanks for the nice catch. Was moving quickly, and that will teach me to post and code.

I made the edit, and PM'ed her, just in case.

Well? See, we are a good crowd, and quick too.

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