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 – II 393
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). e serial ports are
frequently disabled to free an IRQ line for another device.
KEY POINTS OF THIS CHAPTER
The programmable interval timer chips 8253 and 8254 are similar in most ways except that the
latter can be used at higher operating frequencies.
The timer chip has three internal counters each of which has a clock input, a gate and an output pin.
The count in any count-register can be read ‘on the y’ by latching it into a latch.
There are ...
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