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Question

Which interrupt has highest priority ___________.

A
RST 7.5
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B
RST 6.5
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C
INTA
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D
TRAP
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Solution

The correct option is D TRAP

TRAP hasthe highest priority and vectors interrupt. Edge and level triggered means that the TRAP must go high and remain high until it is acknowledged. TRAP interrupts can only be masked by resetting the microprocessor.

A TRAP, also known as an exception or a fault, is typically a type of synchronous interrupt typically caused by an exceptional condition.

TRAPis a non-maskable interrupt. It consists of both level as well as edge triggering and is used in critical power failure conditions. TRAP is the internal interrupt that has the highest priority among all interrupts except the divide by zero exception.


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