May 2024
Intermediate to advanced
665 pages
23h 2m
English
book
The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
by Lyla B. Das
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
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PERIPHERAL INTERFACING I 291
9.2 | Programmable Peripheral Interface (PPI)-8255A
is chip is also called a parallel port chip and it eases out the problems and issues related
to parallel data transfer. Parallel data transfer is what we have done all this time. We have
transferred 8/16 bits at one go either to/from memory or I/O devices. e I/O devices we
have discussed (Chapter 7) were quite simple and needed only a read/write control signal
and a select pulse generated during the read/write cycle. However, when I/O devices are
more versatile and have more features, a PPI will be very useful, especially when more than
one I/O device is ...
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