> Are PICs with RC oscillators viable at this low a frequency?

Absolutely. I tried it out (2002)

http://home.clear.net.nz/pages/joecolquitt/0f84rc.html

Datasheet says DC to whateverMHz, so you can single-step

> Are there any special issues I should be aware of?

Perhaps only in the choice of components at very low frequencies.
As you'll see in the graph above, 270k + 470pF would get you in
the ballpark of 8kHz. PIC's RC internals may have change since
2002 though

Joe


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