On Mon, 14 Dec 1998 14:03:55 -0800 "Michael J. Ghormley" writes: > ORG 0x004 ; interrupt vector > RETFIE ; no legal INT if we get here there is >nothing to do > ; so just return to doing what you >were doing >What do y`all think? A "dummy" ISR consisting of just RETFIE won't clear any interrupt request flags. If an enabled interrupt flag does become set, the PIC will start processing interrupts constantly and the main program will stop. It would be better to use a RETURN instead. The PIC's interrupt logic clears the GIE flag after every interrupt, then ordinarily the RETFIE will re-set it and allow more interrupts. But in this case you don't want more interrupts. A RETURN will leave GIE cleared so more should occur after the first spurious one. In order to be more sure, you could make the "dummy" ISR a little longer and have it clear all the IE flags before returning. ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]