Besides all the suggestions about disabling GIE,
there's another way of processing:
   use double (or more, maybe ring) buffering.
This is especially useful if you can't permit to loose any processor time.
Stef Mientki

Marcel van Lieshout wrote:

>Hello group,
>
>I have a routine as part of my main loop which does some math on 32bit
>integers. The integervalues are stored into the variables by the
>interrupt-routine. It can happen, of course, that my main routine is
>fetching the values while the interruptroutine is storing new values into
>the variables. This overlap would be at least 8 cycles (fetch four
>bytes/store four bytes). Is it possible to hold off interrupt processing
>for, let's say, a dozen cycles? Are there any other failproof solutions?
>
>Regards,
>
>Marcel van Lieshout
>
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