RCM_SRS0 field descriptions (continued)
Field Description
5
WDOG
Watchdog
Indicates a reset has been caused by the watchdog timer timing out. This reset source can be blocked by
disabling the watchdog.
0 Reset not caused by watchdog timeout
1 Reset caused by watchdog timeout
4
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
3
LOL
Loss-of-Lock Reset
Indicates a reset has been caused by a loss of lock in the MCG PLL. See the MCG description for
information on the loss-of-clock event.
0 Reset not caused by a loss of lock in the PLL
1 Reset caused by a loss of lock in the PLL
2
LOC
Loss-of-Clock Reset
Indicates a reset has been caused by a loss of external clock. The MCG clock monitor must be enabled
for a loss of clock to be detected. Refer to the detailed MCG description for information on enabling the
clock monitor.
0 Reset not caused by a loss of external clock.
1 Reset caused by a loss of external clock.
1
LVD
Low-Voltage Detect Reset
If PMC_LVDSC1[LVDRE] is set and the supply drops below the LVD trip voltage, an LVD reset occurs.
This field is also set by POR.
0 Reset not caused by LVD trip or POR
1 Reset caused by LVD trip or POR
0
WAKEUP
Low Leakage Wakeup Reset
Indicates a reset has been caused by an enabled LLWU module wakeup source while the chip was in a
low leakage mode. In LLS mode, the RESET pin is the only wakeup source that can cause this reset. Any
enabled wakeup source in a VLLSx mode causes a reset. This bit is cleared by any reset except
WAKEUP.
0 Reset not caused by LLWU module wakeup source
1 Reset caused by LLWU module wakeup source
14.2.2 System Reset Status Register 1 (RCM_SRS1)
This register includes read-only status flags to indicate the source of the most recent
reset. The reset state of these bits depends on what caused the MCU to reset.
NOTE
The reset value of this register depends on the reset source:
• POR (including LVD) — 0x00
Chapter 14 Reset Control Module (RCM)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 343
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