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6.2.3 MCU resets
A variety of resets are generated by the MCU to reset different modules.
Table 6-2. MCU Resets
Reset
Assertion
Resets What?
Other Actions
POR Only
POR Only reset asserts on the
POR reset source only.
It resets the PMC and RTC.
The POR Only reset also causes
all other reset types to occur.
Chip POR not
VLLS
Chip POR not VLLS reset asserts
on POR and LVD reset sources.
It resets parts of the SMC and
SIM, and also resets the LPTMR.
The Chip POR not VLLS reset
also causes these other resets to
occur:
• Chip POR
• Chip Reset not VLLS
• Chip Reset (including Early
Chip Reset)
Chip POR
Chip POR asserts on POR, LVD,
and VLLS Wakeup reset sources.
It resets the RCM registers and
parts of the SIM and SCG.
The Chip POR also causes the
Chip Reset (including Early Chip
Reset) to occur.
Chip Reset not
VLLS
Chip Reset not VLLS reset asserts
on all reset sources except a VLLS
Wakeup that does not occur via
the RESET_b pin.
It resets parts of the SMC, LLWU,
and other modules that remain
powered during VLLS mode.
The Chip Reset not VLLS reset
also causes the Chip Reset
(including Early Chip Reset) to
occur.
Early Chip
Reset
Early Chip Reset asserts on all
reset sources.
It resets only the flash memory
module.
It negates before flash memory
initialization begins ("earlier" than
when the Chip Reset negates).
Chip Reset
Chip Reset asserts on all reset
sources.
It resets the remaining modules
(the modules not reset by other
reset types).
It only negates after flash
initialization has completed and
the RESET_b pin has also
negated.
6.2.4 RESET_b pin
For all reset sources except a VLLS Wakeup that does not occur via the RESET_b pin,
the RESET_b pin is driven low by the MCU for at least 128 bus clock cycles and until
flash initialization has completed.
After flash initialization has completed, the RESET_b pin is released, and the internal
Chip Reset negates after the RESET_b pin is pulled high. Keeping the RESET_b pin
asserted externally delays the negation of the internal Chip Reset.
The RESET_b pin can be disabled by programming FTFA_FOPT[RESET_PIN_CFG]
option bit to 0 (See
). When this option is selected, there could be a short period
of contention during a POR ramp where the device drives the pin low prior to
establishing the setting of this option and releasing the reset function on the pin. When
the RESET pin is disabled and configured as a GPIO output, it operates as a pseudo open
drain output.
Reset
K32 L2A Reference Manual, Rev. 2, 01/2020
128
NXP Semiconductors
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