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Debug and security
In VLLS mode, all debug modules are powered off and reset at wakeup. In LLS mode,
the debug modules retain their state but no debug activity is possible.
Going into a VLLSx mode causes all the debug controls and settings to be reset. To give
time to the debugger to sync up with the HW, the MDM-AP Control register can be
configured to hold the system in reset on recovery so that the debugger can regain control
and reconfigure debug logic prior to the system exiting reset and resuming operation.
9.7 Debug and security
When flash security is enabled, the debug port capabilities are limited in order to prevent
exploitation of secure data.
In the secure state, the debugger still has access to the status register and can determine
the current security state of the device. In the case of a secure device, the debugger has
the capability of only performing a mass erase operation.
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
110
Freescale Semiconductor, Inc.
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