Depending on the frequency of your 'sine wave', you might not have the part grounded. When you press reset, you do! (This is for 60 hz/50hz sine waves on osc pin). Maybe this could be true for the crystal too, as the PIC might be able to oscillate with it being only grounded thru the reset pin. Sincerely, Dennis Kegley ******************************************************************************* A foolish constinecy is the hobgoblin of little minds. Ralph Waldo Emerson *******************************************************************************