s09_03.htm

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Section 9.3</TITLE></HEAD><BODY><B>up:</B> <A HREF="c09.htm">Chapter 9 -- Exceptions and Interrupts</A><BR><B>prev:</B> <A HREF="s09_02.htm">9.2  Enabling and Disabling Interrupts</A><BR><B>next:</B> <A HREF="s09_04.htm">9.4  Interrupt Descriptor Table</A><P><HR><P><H1>9.3  Priority Among Simultaneous Interrupts and Exceptions</H1>If more than one interrupt or exception is pending at an instructionboundary, the processor services one of them at a time. The priority amongclasses of interrupt and exception sources is shown in <A HREF="s09_04.htm#Table 9-2">Table 9-2</A>. Theprocessor first services a pending interrupt or exception from the classthat has the highest priority, transferring control to the firstinstruction of the interrupt handler. Lower priority exceptions arediscarded; lower priority interrupts are held pending. Discarded exceptionswill be rediscovered when the interrupt handler returns control to the pointof interruption.<P><HR><P><B>up:</B> <A HREF="c09.htm">Chapter 9 -- Exceptions and Interrupts</A><BR><B>prev:</B> <A HREF="s09_02.htm">9.2  Enabling and Disabling Interrupts</A><BR><B>next:</B> <A HREF="s09_04.htm">9.4  Interrupt Descriptor Table</A></BODY>

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