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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PERIPHERAL INTERFACING–II 10-35
D
0
indicates whether ICW4 is necessary.
D
1
indicates whether the system is operating in a slave or master mode. If D = 1, it is a
slave mode and hence ICW3 is not needed.
D
2
= 0 always for the x86 processor.
D
3
selects the options of edge or level triggering for the interrupt lines IR0 to IR7.
D
4
is high always in the ICW1 and D
5
to D
7
are low for x86 processors.
10.3.7.2
|
ICW2 (Initialization Command Word2)
This word allows us to decide the type of numbers to be associated with the interrupt
input lines of IR0 to IR7 (See Fig. 10.25).
This word is sent with A0 = 1. The bits D
2
to D
0
vary from 000 to 111 and, together ...
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