first-level interrupt handler
first-level interrupt handler[′fərst ¦lev·əl ′int·ə‚rəpt ‚hand·lər]
A software or hardware routine that is activated by interrupt signals sent by peripheral devices and decides, based on the relative importance of the interrupts, how they should be handled. Abbreviated FLIH.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.