Subject:
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Re: microcontroller speeds
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 28 Jun 1998 17:12:15 GMT
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Original-From:
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Patrick Cutts <patrick@[nomorespam]surfari.net>
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Reply-To:
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<patrick@surfari.net%stopspam%>
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Viewed:
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1120 times
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If they replace the controller on their board with a chip that is rated at
20MHz but they are still using the old board with its 16MHz oscillator
won't it still run at 16MHz?
----------
> From: Thomas Hauri <har@twi.ch>
> To: brian-c@technologist.com
> Cc: handyboard@media.mit.edu
> Subject: Re: micrcontroller speeds
> Date: Sunday, June 28, 1998 8:34 AM
>
> Hi
>
> Replacing the 16MHz version with the 20 Mhz CPU would affect only the
> timer speed of the internal timers.
> We are using the MC and MD versoon of the 196.
> Connected to those timers are about the following :
>
> -PWM 1 & 2
> -Wavegenerator (if it has one)
> - timer unit (capture and compare unit)
> - counters
> - serial interface (UARTS)
>
> Maybe there is more, but at this time a can't think of any.
>
> What your main problem will be if using motion control is that your pwm
> will run at a 25% higher speed and the time critical stuff relaying on
> the timer structure. Further any real tme interrupts will run 25%
> faster. Speed measurement using the timers will go wrong by 25%.
>
> You may have to change all the above to be sure your system doesn't do
> strange things.
>
> Hope this helps a little.
>
> BYE Tom
>
>
>
>
> brian-c@technologist.com schrieb:
>
> > This question has nothing to do with the Handy Board
> > although it is a general question which I need some
> > help with.
> >
> > Previous students at the school I attend left behind
> > a robot which they worked on. The microcontroller was
> > Intel's 80C196. The microcontroller is shot however,
> > so we need to get a replacement. It is offered in both
> > 16 and 20 MHz versions. The original used in the robot
> > was the 16 MHz version, however we can only find the
> > 20 MHz version now.
> >
> > If I was to replace the 16 MHz controller with a
> > 20 MHz version would it affect any of the programming?
> > What would some effects be if any?
> >
> > Maybe direct help some of you big microcontroller
> > gurus would be best. (Fred, Randy,... hint,hint) :)
> >
> > Thanks in advance,
> > _________________________________________________
> > ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
> > Brian Carvalho [ brian-c@ieee.org ]
> > DeVRY Institute
> > New Jersey
> > _________________________________________________
> > ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
>
>
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