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EN0-001 – ARM Accredited Engineer

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Showing 10–12 of 15 questions

Question 10

Implementing loops using a decrementing counter which exits the loop when a counter reaches zero can be beneficial for power and performance. This is because:

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    A simpler branch instruction can be used.
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    Decrementing variables uses less power than incrementing them.
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    The decrement and branch operations can be encoded as a single instruction.
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    The loop termination condition check can be integrated into the subtract operation.
Question 11

An undefined instruction will cause an Undefined Instruction exception to be taken when:

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    It is fetched.
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    It is decoded.
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    It is executed.
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    It writes back its results.
Question 12

In the CPSR, 1=0 and F=1. Which of the following is TRUE in this case?

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    Both IRQs and FIQs are enabled
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    Both IRQs and FIQs are disabled
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    IRQs are disabled and FIQs are enabled
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    IRQs are enabled and FIQs are disabled