3.11. Instrumentation resources

Instrumentation resources provide a simple, low-overhead method of controlling tracing from software, based on:

For a PTM implementation, the number of Instrumentation resources is implementation defined. A PTM implementation:

Bits [15:13] of the Configuration Code Extension Register specify the number of Instrumentation resources implemented. See Configuration Code Extension Register, ETMCCER.

In addition, if the PTM implements at least one Instrumentation resource, you can use the Instrumentation resource control bit, bit [24], of the Main Control Register to control the availability of Instrumentation resource programming. If this bit is set to 1, the Instrumentation resources can be programmed only when the processor is in a privileged mode. For more information see Main Control Register, ETMCR.

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