3.2.4. Restrictions on the type of access to ETM registers

In The ETM registers, Table 3.3 shows the access type, read-only, write-only, or read/write, of each ETM register. Debug software must take account of these access types. Behavior is unpredictable if you attempt a read access to a write-only register, or a write access to a read-only register. This is true for all methods of accessing the registers.

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