> Can the 16f628 portb be configured so that "interrupt on change"
> is enabled and RB6 and RB7 is configured for 32768 xtal?

> I will only be using the RB4 and RB5, but since RB7 is T1OSI (osc
> input), do I get an interrupt because it is connected to xtal?

I don't think it would work

Section 5.2 - "Only pins configured as inputs can cause this
interrupt to occur"

Section 7.0 - "when Timer1 oscillator is enabled, the RB6 and
RB7 pins become inputs"

but you could always try it and see

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.