> The reason for the low clock speed is that I MUST get the thingie
> to use as low current as ever possible. If I look in the data sheet
> it seems like the curent consumption is approx proportional to
> the clock rate, hence this low clock freq.
> I am trying to replace an EPLD logic circuit with the PIC16C84
> and the requirement is that operating current has to be below
> 500 uA. With the sleep trick I can probably get it down there as
> average current because of the low signalling duty cycle.
> But I think that 10 MHz clock will raise current too much.
> Code packets consist of 4 chars at 1200 baud which effectively
> keeps the PIC out of sleep for about 33 ms.

I don't know what else your application is doing, but might it be possible
to use a 32KHz PIC and just leave it running all the time?  1200 baud is
possible on such a device of you're not doing anything else while waiting
for a character.  If you had an interrupt on the start bit, you may even
be able to do other processing while waiting for characters but I've never
done it that way.