> Dear Mike, 
> thanks for the quick response.  
> I am a bit confused - why TOSC = 1us since TOSC = 1/4000000 = 2.5 x 10-7? 
>   
> regards 
> Antonis

Whenever you consider internal clock period in a PIC, it is 1/4 the
external clock speed.  For example, Tosc if the external clock is 20
MHz the period would be 200 ns.

Mike H.
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