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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5-16
THE
x86 MICROPROCESSORS
l There are two types I/O addressing – fixed port and variable port.
l If the address is 8 bits, fixed port addressing is to be used; if the address is 16 bits,
variable port addressing is to be used.
l An I/O port can have only a maximum address size of 16 bits.
l The 8086 can address 2
16
input ports and 2
16
output ports. There are directives which
allow programs in different modules to be linked together.
l Modular programming is very useful when it is necessary to use the service of
frequently used modules.
l In modular programming, the directive PUBLIC indicates that the referred data item or
procedure is accessible ...
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