Indeed, it may be worth trying to run the clock from lower voltages, e.g. 9V or 7V instead of 12V, so the VDD-2V Vih is not so far off the mark. I think the cascading issue mentioned above shouldn't be a problem at the likely low clock frequency. But he mentioned a triangle wave on the data line: is it ok when not connected to the 5530? (i.e., is the PIC at least outputting a correct data signal?)
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