9.3.2 MDM-AP Status Register
Table 9-4. MDM-AP Status register assignments
Bit Name Description
0 Flash Mass Erase Acknowledge The Flash Mass Erase Acknowledge bit is cleared after any system reset.
The bit is also cleared at launch of a mass erase command due to write of
Flash Mass Erase in Progress bit in MDM AP Control Register. The Flash
Mass Erase Acknowledge is set after Flash control logic has started the
mass erase operation.
When mass erase is disabled (via MEEN and SEC settings), an erase
request due to seting of Flash Mass Erase in Progress bit is not
acknowledged.
1 Flash Ready Indicate Flash has been initialized and debugger can be configured even if
system is continuing to be held in reset via the debugger.
2 System Security Indicates the security state. When secure, the debugger does not have
access to the system bus or any memory mapped peripherals. This bit
indicates when the part is locked and no system bus access is possible.
3 System Reset Indicates the system reset state.
0 System is in reset
1 System is not in reset
4 Reserved
5 Mass Erase Enable Indicates if the MCU can be mass erased or not
0 Mass erase is disabled
1 Mass erase is enabled
6 Backdoor Access Key Enable Indicates if the MCU has the backdoor access key enabled.
0 Disabled
1 Enabled
7 LP Enabled Decode of SMC_PMCTRL[STOPM] field to indicate that VLPS, LLS, or
VLLSx are the selected power mode the next time the ARM Core enters
Deep Sleep.
0 Low Power Stop Mode is not enabled
1 Low Power Stop Mode is enabled
Usage intended for debug operation in which Run to VLPS is attempted.
Per debug definition, the system actually enters the Stop state. A
debugger should interpret deep sleep indication (with SLEEPDEEP and
SLEEPING asserted), in conjuntion with this bit asserted as the debugger-
VLPS status indication.
8 Very Low Power Mode Indicates current power mode is VLPx. This bit is not ‘sticky’ and should
always represent whether VLPx is enabled or not.
This bit is used to throttle SWD_CLK frequency up/down.
Table continues on the next page...
Chapter 9 Debug
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 155
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