Read page 17 of the data sheet, and tell us *then* what's unclear. From your question, I don't think you have. (Hint: "parallel cut", and two caps with a value according to the tables on page 17...) Jan-Erik Soderholm John Nall wrote: >I am in the process of getting my first test bed set >up (for an 18F452) and need to order a 10 Mhz crystal. They seem to come >in two flavors: serial, and 20pF. My understanding is that the 20pF is >the preferred one. If that is true, is it still necessary to use the two >caps to ground from the leads??? -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body