NXP Semiconductors K22F series - MDM-AP Status Register

Table 9-5. MDM-AP Control register assignments (continued)
Bit Name Secure
1
Description
8 Timestamp Disable N Set this bit to disable the 48-bit global trace timestamp counter during
debug halt mode when the core is halted.
0 The timestamp counter continues to count assuming trace is
enabled. (default)
1 The timestamp counter freezes when the core has halted (debug halt
mode).
9 –
31
Reserved for future use N
1. Command available in secure mode
9.5.2 MDM-AP Status Register
Table 9-6. MDM-AP Status register assignments
Bit Name Description
0 Flash Mass Erase Acknowledge The Flash Mass Erase Acknowledge bit is cleared after POR or any debug
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 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 LPLLSM control bits 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
Table continues on the next page...
Chapter 9 Debug
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 207