|Non-Confidential||PDF version||ARM 100241_0001_00_en|
|Home > Debug > ETM registers > Power Down Status Register|
The TRCPDSR characteristics are:
OS lock status.
|The OS Lock is unlocked.|
|The OS Lock is locked.|
Sticky power down state.
|Trace register power has not been removed since the TRCPDSR was last read.|
|Trace register power has been removed since the TRCPDSR was last read.|
This bit is set to 1 when power to the ETM trace unit registers is removed, to indicate that programming state has been lost. It is cleared after a read of the TRCPDSR.
Indicates the ETM trace unit is powered:
|ETM trace unit is not powered. The trace registers are not accessible and they all return an error response.|
|ETM trace unit is powered. All registers are accessible.|
If a system implementation allows the ETM trace unit to be powered off independently of the debug power domain, the system must handle accesses to the ETM trace unit appropriately.
The TRCPDSR can be accessed through the external debug interface, offset