On Sun, 2006-04-09 at 06:24 -0700, Peter van Hoof wrote: > Are you doing context saving? > You mention in the first line of your isr you clear > the intf. This should not be! Yes, I save W and the status reg, but I do it after I clear INTF at the beginning. I clear INTF at the end of the ISR now too.. Cheers, Tim -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist