In additon to what the others have said ... I went to MELabs website and used their PIC search tool to find all PICs that have internal oscillator capabilities. You can see these here:
http://tinyurl.com/rjfux
As far as specific examples, I have a picture posted (link below) showing a serial interface to a custom display (with no external oscillator)
http://tinyurl.com/rtgtm
a small code snippet is included under the picture. As the others have noted, the choice to use the internal or external is made when you program the chip. Follow the links they provided for more information on that.
Good Luck
Paul Borgmeier
Salt Lake City, UT
USA
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