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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
244 THE x86 MICROPROCESSORS
Example 7.8
Find the addresses of the two input devices shown in Figure 7.21 and write a program to read
data from each of these ports and move it to some other registers.
Solution
Two sets of 8 switches Si)
0
to S
7
are connected to the data bus through two tri-state buff ers
and this setup functions as two input ports.
e address of the ports are 8-bit, as only address lines Aii)
0
to A
7
have been considered for
decoding.  e address of the fi rst port is 7EH and that of the second is 3EH.
e address on the address bus decides which of the input ports get selected.  e tri-state iii)
buff er ensures that the port which ...
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Publisher Resources

ISBN: 9781282663169