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The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
book

The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition

by Lyla B. Das
May 2024
Intermediate to advanced content levelIntermediate to advanced
665 pages
23h 2m
English
Pearson India
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
PROGRAMMING CONCEPTS – IV 193
KEY POINTS OF THIS CHAPTER
In the use of an input port, RD is the control signal of importance. The machine cycle initiated is
the I/O Read machine cycle.
In the use of an output port, WR is the control signal of importance. The machine cycle initiated is
the I/O. Write machine cycle.
An I/O port can have 8 or 16 as the width of its data bus.
An I/O port can have 8 or 16 as the width of its address bus.
There are two schemes for I/O interfacing i.e., memory mapped I/O and I/O mapped I/O.
There are two types I/O addressing –  xed port and variable port.
If the address is 8 bits,  xed port addressing is to ...
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Publisher Resources

ISBN: 9781282663169