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–III 11-23
as is seen now, the serial port as well as the parallel port are obsolete, because of being
superseded by the USB port.
11.5 | Direct Memory Access
Data transfer between peripherals and memory is a frequent activity in any computer
system. There are three methods by which this can be done; we have seen two such
methods – polling and interrupt based data transfer. Polling is unacceptable, except for
very small systems, because it keeps the processor in a waiting loop. Interrupt based
data transfer is fine, because only when data transfer is needed, is the processor called
into action for this.
Now, there is a third ...
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