On Tue, 17 Jun 2008 17:56:19 +0100, "Tom=E1s =D3 h=C9ilidhe" said: > = > 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. Yes. = > I want the absolute maximum speed though (so I think that means I use an = > RC circuit to tell it what speed I want). Probably not. RC mode is not great at very high frequencies and uses a lot of current. But it varies a lot from part number to part number, so you should probably dig deeply in the datasheet if you really want to use RC mode. And find that info is incomplete or preliminary. Nobody uses RC mode on the '887. > Could someone please explain to me what pin I put the RC on, what RC = > values to use, what registers to set, etc.? I doubt you'll find anyone here who has used RC mode on an '887. Use a crystal or approved ceramic resonator(I posted resonator tests a while back, some don't work so well at 20MHz). Cheerful regards, Bob -- = http://www.fastmail.fm - I mean, what is it about a decent email service? -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist