AVR-Chat

I know this sounds a simple "of course" type question but:

I could have the controller output a 10uSec pulse and read it with a
logic analyzer to verify that the timing is correct.

[This verifies that the caps are correct for the oscillator]

Correct assumption?



--- In AVR-Chat@yahoogroups.com, David VanHorn <microbrix@...> wrote:
>
> On Mon, Feb 23, 2009 at 12:54 PM, David Appleton <englsprogeny@...>
wrote:
> >
> >
> > Could we also do a timer test?
> > Is 10uSec really 10uSec?
> 
> The problem is that you have nothing to reference it to, other than
> the crystal, unless you have some independent external timebase.
> 
> A 60Hz line signal would do, 32kHz crystal...
> 
> The WDT is good for detecting the system running slower than it
> should, but not for faster!
> 
> With an external timebase, you can put a window around it, and if the
> pulse isn't present, or the period seems abnormal, then go into an
> appropriate "fail safe" mode.
>