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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10-46
THE
x86 MICROPROCESSORS
Initially, IRQ7 was a common choice for the use of a sound card, but later, IRQ5 was
used when it was found that IRQ7 would interfere with the printer port (LPT1). The
serial ports are frequently disabled to free an IRQ line for another device.
KEY POINTS OF THIS CHAPTER
l The programmable interval timer chips 8253 and 8254 are similar in most ways except
that the latter can be used at higher operating frequencies.
l The timer chip has three internal counters each of which has a clock input, a gate and
an output pin.
l The count in any count-register can be read ‘on the fly’ by latching it into a latch.
l There are ...
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