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What does the word UNPREDICTABLE exactly mean and what is its effect on the system?

Mazen Ezzeddine

Hi,

In many of ARM documentation result of operations are reported as unpredictable in some situations. For example, "If the system includes the Security Extensions, accesses to CNTVOFF from Secure Monitor mode are UNPREDICTABLE." what does the word UNPREDICTABLE exactly mean and what is its effect on the system? would that causes an exception and system switch to a certain mode?

Many thanks.

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