Yes, Sean, I've seen the same kind of documentation problems when using MK20DX256 and the related processors to bring up C Forth. However, I've been a documentation writer, had used Marvell ARM documentation for a few years, and was very used to different styles. By far the biggest annoyance when compared to PIC is that the imported IP isn't documented by the vendor, so one has to go to ARM for that. For large enough quantities, I'd engage with the vendor. That's what we (at OLPC) did with Marvell and we got some good clarifications or documentation updates out of it. --=20 James Cameron http://quozl.netrek.org/ --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .