10.4.11. OS Lock Access Register

The DBGOSLAR characteristics are:

Purpose

Provides a lock for the debug registers.

Writing the key value to the DBGOSLAR also resets the internal counter for the OS Save or Restore operation.

Usage constraints

Use DBGOSLSR to check the current status of the lock, see OS Lock Status Register.

Configurations

Available in all configurations.

Attributes

See the register summary in Table 10.1.

Figure 10.13 shows the DBGOSLAR bit assignments.

Figure 10.13. DBGOSLAR bit assignments

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Table 10.13 shows the DBGOSLAR bit assignments.

Table 10.13. DBGOSLAR bit assignments

BitsNameFunction
[31:0]OS Lock Access

Writing the key value 0xC5ACCE55 to this field locks the debug registers for the OS Save or Restore operation.

Writing any other value to this register unlocks the debug registers if they are locked. See the ARM Architecture Reference Manual for more information.


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