> Cannot remember which chips I was looking at that had this facility, but > IIRC they were 18F series. I think that is only availible on 44 pin TQFP version of the 4455/4550, i could be wrong though. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist