> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Tom=E1s =D3 h=C9ilidhe
> Sent: 17 June 2008 17:56
> To: Microcontroller discussion list - Public.
> Subject: [PIC] Max speed from 887
> =

> =

> I'm used to using the 16F684, and I had the following macro for getting
> the greatest speed out of it:
> =

>     #define CrankTheSpeed() ((void)(OSCCON |=3D 0b1110000,OSCTUNE =3D 0b1=
111))
> =

> I got myself a "Pickit2 Debug Express" today though, and from now on
> I'll be working with the 16F887.
> =

> I took a quick glance at the datasheet for the 887 and it tells me that
> the max speed I'll get is 8 MHz if I choose to use internal oscillators.
> =

> I want the absolute maximum speed though (so I think that means I use an
> RC circuit to tell it what speed I want).
> =

> Could someone please explain to me what pin I put the RC on, what RC
> values to use, what registers to set, etc.?

Using an external RC oscillator for high speeds is going to give you an unp=
redictable frequency that will be very prone to drifting with temperature a=
nd hand capacitance effects.  Don't do it.

Regards

Mike

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