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 80286 AND 80386 PROCESSORS 541
e diff erence between the ’286 and ’386 is that in the case of the former, it is not possible
to return to the real mode without doing a hardware reset. However, in the case of the ’386,
returning to the real mode is possible by clearing the PE bit and loading it to CR0 again.
Of course, various conditions will have to be arranged before switching back to the real
mode. All these conditions can be put inside a procedure, with the fi nal instruction being the
clearing of the PE bit of CR0. us, the processor returns to real mode.
15.13.2 | Virtual 8086 Mode
We know that even though the protected mode is important, ...
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