Note about ISCR.IRQF

The IRQF bit in the interrupt status and control register on the 68(7)05J1A seems to move around. In our documentation for the 705J1A, it appears at bit 4; in the 05J1A, at bit 3. I've also seen documentation somewhere that shows it at bit 6. Be sure to consult your technical data. It is referenced several times throughout the source files.