In the 18F series there are High & Low priority interrupts. This may seem a bit silly :-) but when should you use each type of interrupt? _______________________________________ Roy Tauranga New Zealand _______________________________________ -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.10.2 - Release Date: 21/04/2005 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist