Spin Clock Cycles

Computer Geek 101

Is there any data on how many clock cycles each SPIN instruction takes?

Erik Friesen

It varies but it is somewhere in the 1000 on up range. You can test this yourself by timing a loop.

Paul Baker

To expand on Erik's comment, an oscilloscope will tell you everything you need. Make a Pin high, then immediately make it low, measure the pulse width and record the value. Now place anything you want in between the two instructions, measure it, subtract the original pulse width and divide it by the colock frequency and you have your answer for how long it takes to execute that instruction(s).

If you don't have an oscilloscope, you can use a counter to measure the pulse width.

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Paul Baker


Post Edited (Paul Baker) : 1/28/2009 11:34:14 PM GMT

jazzed

See this post for some measurements based on 80MHz operation:
http://forums.parallax.com/forums/default.aspx?f=25&m=317689&g=318421#m318421

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--Steve

Computer Geek 101

thanks for the info ill get to work on it now