The TRAP is one of the interrupts available in INTEL 8085. Which one of the…
2008
The TRAP is one of the interrupts available in INTEL 8085. Which one of the following statements is true of TRAP ?
- A.
it is level triggered
- B.
it is negative edge triggered
- C.
it is +ve edge triggered
- D.
it is both +ve and -ve edges triggered
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Correct answer: C
the question is not plotted correctly.
It is both edge and level triggered.
While your options list +ve edge triggered and level triggered separately, the defining characteristic of TRAP is that it requires both conditions to be met to be recognized by the microprocessor.
Why it uses both:
Positive Edge Sensitive: The signal must transition from Low to High to be recognized. This prevents the CPU from being interrupted multiple times by the same high signal (it "remembers" the edge).
Level Sensitive: After the edge occurs, the signal must stay High until the CPU completes its current instruction and samples the interrupt. This ensures that a brief noise spike isn't mistaken for a valid TRAP signal.