Information

6.2.2.9 Lockup reset (LOCKUP)
The LOCKUP gives immediate indication of seriously errant kernel software. This is the
result of the core being locked because of an unrecoverable exception following the
activation of the processor’s built in system state protection hardware.
The LOCKUP condition causes a system reset and also causes the RCM's
SRS1[LOCKUP] bit to set.
6.2.2.10 EzPort reset
The EzPort supports a system reset request via EzPort signaling. The EzPort generates a
system reset request following execution of a Reset Chip (RESET) command via the
EzPort interface. This method of reset allows the chip to boot from flash memory after it
has been programmed by an external source. The EzPort is enabled or disabled by the
EZP_CS pin.
An EzPort reset causes the RCM's SRS1[EZPT] bit to set.
6.2.2.11 MDM-AP system reset request
Set the system reset request bit in the MDM-AP control register to initiate a system reset.
This is the primary method for resets via the JTAG/SWD interface. The system reset is
held until this bit is cleared.
Set the core hold reset bit in the MDM-AP control register to hold the core in reset as the
rest of the chip comes out of system reset.
6.2.3 MCU Resets
A variety of resets are generated by the MCU to reset different modules.
6.2.3.1 VBAT POR
The VBAT POR asserts on a VBAT POR reset source. It affects only the modules within
the VBAT power domain: RTC and VBAT Register File. These modules are not affected
by the other reset types.
Reset
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
158 Freescale Semiconductor, Inc.