Do you know how this potential instruction corruption when the part is used above 4MHz (for Rev A3 silicon) effects the PLL ? Will the part work reliably if using 4MHz crystal and x4 multiplier. We are developing a system using 18F6720 running at 10MHz. The revision is the dreaded V3.0 I have been running with ICD2 only but so far have not observed any=20 strange behaviour.=20 Kind Regards David Huisman -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body