"Interrupts are a very powerful tool and as earlier you learn to use it, as more you like it. "

I could understand your violent reaction to my statement "the software-circus with interrupts is best avoided" .

Only thing you have missed the context in which I made the statement - not to worry. I love interrupts as much as anyone and there is hardly a code of mine that goes without interrupts.

Getting down to specifics :

I said I have a 2ms demux update for each digit. This I am deriving from a basic 1ms ISR.

Suppose I am reading a RPM of 100, then with the 1 pulse/rev disc, this will mean a timing period of 600ms, and thus will have to be interrupted 600 times ! Not very elegant aint it ?

On the other hand if I shift the priority to Measuring then the display demux will be delayed to 600ms. Again not very pleasant ?

Hope it clarifies my stand on interrupts IN THIS CASE.

However your point is well taken and I am reading the finer print in the PCA section !!

Raghu