On Fri, Apr 05, 2002 at 01:26:36PM +0100, Hugo Harming wrote:
> Hi group!
>
> Are there preferred pins to use for serial I/O?

Yes. RB1 and RB2. However you'll want those pins on a 16F627 or 16F628 instead
of a 16F84. See the 16F62X parts have a true hardware USART like most of the
midrange PIC family. Teh 16F84 doesn't.

So even if you're going to work with a 16F84, it may be an excellent idea to
use RB1 for receive and RB2 for transmit so that you can drop in a 16F62X
part and start using the hardware USART.

BTW the 16F62X series has more memory, more peripherals, an internal
osciallaor, the ability to gain 3 extra I/O all in the same 18 pin package
as the 16F84. And did I metion that it was cheaper?

>
> I'm asking because I've seen different serial routines use different pins, in
> some cases one pin from port A and one from port B.

I'd suggest thinking of RB1/RB2 as a standard so that there's an easy upgrade
path.

BAJ

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