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23.2.4 Reset pin
For all reset sources, the RESET_B pin is driven low by the MCU for at least 128 bus
clock cycles and until flash memory initialization has completed.
After flash memory initialization has completed, the RESET_B pin is released and the
internal chip reset deasserts. Keeping the RESET_B pin asserted externally delays the
negation of the internal chip reset.
23.2.5 Debug resets
The following sections detail the debug resets.
23.2.5.1 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 MCU to write 1 to
field.
23.2.5.2 Resetting the debug subsystem
Use the CDBGRSTREQ field within the SWJ-DP CTRL/STAT register to reset the
debug modules. However the CDBGRSTREQ field does not reset all debug-related
registers.
CDBGRSTREQ resets only 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 these modules:
• CM4 core (core debug registers: DHCSR, DCRSR, DCRDR, DEMCR)
• FPB
• DWT
• ITM
• NVIC
• Crossbar bus switch
• Private peripheral bus
Chapter 23 Reset and Boot
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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