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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9-8
THE
x86 MICROPROCESSORS
Bit Assignment of the Control Word First, look at D7 – it suggests the options of I/O
mode or BSR mode. To begin with, let us use the chip in the I/O mode. This is the normal
mode of operation (BSR mode is a special mode catering to Port C alone, which we will
deal with later). The next thing to do in this is to decide the mode of operation of the two
groups. It is acceptable for the two groups to be in different or same modes. After this is
done, select the option of a particular port being either an input or output port. For i/p,
the corresponding bit is to be 1, and for output, it is to be 0.
9.3 | Modes of Operation ...
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