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OS Lock Access Register

The TRCOSLAR characteristics are:


Sets and clears the OS Lock, to lock out external debugger accesses to the ETM trace unit registers.

Usage constraints

There are no usage constraints.


Available in all configurations.


See the register summary in Table 13.3.

Figure 13.42 shows the TRCOSLAR bit assignments.

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Table 13.43 shows the TRCOSLAR bit assignments.

Table 13.43. TRCOSLAR bit assignments
Bits Name Function
[31:1] - TRCRSCTLRn
[0] OSLK

OS Lock key value:


Unlock the OS Lock.


Lock the OS Lock.

The TRCOSLAR can be accessed through the internal memory-mapped interface and the external debug interface, offset 0x300.

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