1.
I would say that very few (1 out of 100 ?) *real*
applications/projects could be written without
using interrupts. They are such an integral part
of the processor architecture, so it will be much
harder to *not* use them.

2.
Experience...
Or simply counting cycles for your most common routines.

Regards,
Jan-Erik.


Andre Abelian wrote:
> Hi to all,
> 
> 1.
> I was working on a project that took me 1,5 month to get it done.
> After going thru lots of troubles later on I started using interrupts
> then all of our problems went a way. My question is how do you guys
> calculate or figure out that interrupt is required ?. 
> 
> 2. My second question is how do you calculate how much clock speed needed?
>    or should I always use 40 mhz. most of the time I use 20 mhz.
>    
> 
> thanks
> 
> Andre
> 
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