
22.2.5 Debug resets
The following sections detail the debug resets available on the device.
22.2.5.1 JTAG reset
The JTAG module generate a system reset when certain IR codes are selected. This
functional reset is asserted when EXTEST, HIGHZ and CLAMP instructions are active.
The reset source from the JTAG module is released when any other IR code is selected.
A JTAG reset causes the RCM'_SRS[JTAG] bit to set.
22.2.5.2 nTRST reset
The nTRST pin causes a reset of the JTAG logic when asserted. Asserting the nTRST pin
allows the debugger to gain control of the TAP controller state machine , without
resetting the state of the debug modules.
The nTRST pin does not cause a system reset.
22.2.5.3 Resetting the Debug subsystem
Use the CDBGRSTREQ bit within the SWJ-DP CTRL/STAT register to reset the debug
modules. However, as explained below, using the CDBGRSTREQ bit does not reset all
debug-related registers.
CDBGRSTREQ resets the debug-related registers within the following modules:
• SWJ-DP
• AHB-AP
• TPIU
• MDM-AP (MDM control and status registers)
CDBGRSTREQ does not reset the debug-related registers within the following modules:
• CM4 core (core debug registers: DHCSR, DCRSR, DCRDR, DEMCR)
• FPB
• DWT
• ITM
• NVIC
• Crossbar bus switch
Chapter 22 Reset and Boot
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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Summary of Contents for KE1xF Series
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