Hi,

> Hello everyone,
>
> I am a little bit confused here... can somebody confirm that...
>
>         - on a pic16c84/04 one instruction takes 1us

Assuming the PIC runs at 4 MHZ, yes.  The /04 only means that they
(Microchip) guarentees operation up to 4MHz.  One instruction takes
4/Fosc seconds (except branches, goto's, etc, which take 2/Fosc).

>         - on a pic16c84/10 one instruction takes 400ns

If it runs at 10MHz, as above.  The /10 PIC is guarenteed to run at up to
10MHz.

Of course, if you run both PICs at, say 1MHz, the instruction times will
be identical.

Hope this clarifies it!
Niki