Skip to Main Content
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
180 THE x86 MICROPROCESSORS
WR
RD
ADDRESS BUS
8086
OUTPUT
PORT
INPUT
PORT
DATA BUS
Figure 5.1 | I/O ports with address bus and data bus and the read and write control signals
5.1.1 | Memory Mapped I/O
In this scheme, the I/O device has the same address space and addressing scheme as memory.
For example, given the instruction MOV AL, [3456H], the address 3456H may be a memory
location or the address of an I/O device.  at means, that if there are 50 I/O devices in a system,
the address space available to memory gets reduced by 50. However, that also means that I/O
does not need any special instructions for access, and also that data from/to I/O can ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Microprocessors and Microcontrollers  by Pearson

Microprocessors and Microcontrollers by Pearson

Lyla B Das

Publisher Resources

ISBN: 9781282663169