Table 9-6. MDM-AP Status register assignments (continued)
Bit Name Description
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 JTAG TCK frequency up/down.
9 LLS Mode Exit This bit indicates an exit from LLS mode has occurred. The debugger will
lose communication while the system is in LLS (including access to this
register). Once communication is reestablished, this bit indicates that the
system had been in LLS. Since the debug modules held their state during
LLS, they do not need to be reconfigured.
This bit is set during the LLS recovery sequence. The LLS Mode Exit bit is
held until the debugger has had a chance to recognize that LLS was exited
and is cleared by a write of 1 to the LLS, VLLSx Status Acknowledge bit in
MDM AP Control register.
10 VLLSx Modes Exit This bit indicates an exit from VLLSx mode has occurred. The debugger
will lose communication while the system is in VLLSx (including access to
this register). Once communication is reestablished, this bit indicates that
the system had been in VLLSx. Since the debug modules lose their state
during VLLSx modes, they need to be reconfigured.
This bit is set during the VLLSx recovery sequence. The VLLSx Mode Exit
bit is held until the debugger has had a chance to recognize that a VLLS
mode was exited and is cleared by a write of 1 to the LLS, VLLSx Status
Acknowledge bit in MDM AP Control register.
11 – 15 Reserved for future use Always read 0.
16 Core Halted Indicates the Core has entered debug halt mode
17 Core SLEEPDEEP Indicates the Core has entered a low power mode
SLEEPING==1 and SLEEPDEEP==0 indicates wait or VLPW mode.
SLEEPING==1 and SLEEPDEEP==1 indicates stop or VLPS mode.
18 Core SLEEPING
19 – 31 Reserved for future use Always read 0.
9.6 Debug Resets
The debug system receives the following sources of reset:
• JTAG_TRST_b from an external signal. This signal is optional and may not be
available in all packages.
• Debug reset (CDBGRSTREQ bit within the SWJ-DP CTRL/STAT register) in the
TCLK domain that allows the debugger to reset the debug logic.
• TRST asserted via the cJTAG escape command.
• System POR reset
Debug Resets
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
208 NXP Semiconductors
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