> > I must measure the input signal with 1 5s precision.
>
> Doing that on a PIC while simultaneously doing other things is no
> freshmans game. Consider
> - dedicated hardware
> - a dedicated PIC
> - maybe even a (dedicated) Ubicom SX
>
> NB a 16F runs at 5 MIPS @ 20 MHz maximum. An 18F runs at 10 MIPS at 40
> MHz (10 MHz xtal with PLL * 4) maximum. An SX runs at 75 MIPS @ 75 MHz
> maximum (or you might still be able to find 100 MHz SXes).
>
> A SX is a clone of the older 12-bit PICs, but for simple timing tasks it
> will run circles around any PIC. And any AVR. And probably most other
> cheap microcontrollers. And maybe even some DSPs.

        Umm, I guess you are forgetting the CCP, at a 20MHz PIC clock it has a
resolution of 0.20us. A 16F877 would be fine for that sort of task. TTYL

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