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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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 ...
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