May 2024
Intermediate to advanced
665 pages
23h 2m
English
book
The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
by Lyla B. Das
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
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THE INTERRUPT STRUCTURE OF 8086 259
as they always contain the release date of the code i.e., BI0S (which is 20th June 2005 for this
PC). See the ASCII code of this marker:
30 36 2F 32 30 2F 30 35 i.e., 06/20/05 in the format mm/dd/yy.
8.5 | Priority of Interrupts
When many interrupts occur at the same time, which source gets its request honored fi rst? e
processor decides the priority. e order of priority is set in the following manner:
Internal interrupts and Software interrupts – get the highest priority,i)
NMI,ii)
INTR – gets the lowest priority.iii)
Consider a case when the INTO, NMI and INTR occur simultaneously. Because of the inbuilt
priority mechanism, the internal interrupt (INTO) will be taken up for servicing fi rst. One
step ...
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