May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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THE INTERRUPT STRUCTURE OF 8086 8-11
Can We Consider the Reset Pin as an Interrupt Pin?
When the reset pin is activated, the processor resets and control branches to the absolute
address FFFF0H. Thus, reset has a particular pointer or vector – which is just the way
an interrupt functions. Thus, RESET is sometimes included in the list of hardware inter-
rupts along with NMI and INTR.
For a PC, the process of resetting also occurs when the system is powered on. Let us note
some points regarding ‘power on’. In fact, the address FFFF0H is designated as the ‘power
on reset vector’. This address (FFFF0H) is in ROM and contains a far jump instruction to
the beginning of the BIOS chip ‘power on reset code’. To find this vector, go to command
prompt C ...
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