Hi, it is not clear from the data sheet, but is the T0CKI pin on a PIC12C508A based on a Schmitt trigger? It would be terribly useful to know, and also whether the T0CKI pin on other PIC family members has the same property. Andy -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics