NOTE
The reset value of this register depends on the reset source:
• POR (including LVD) — 0x82
• LVD (without POR) — 0x02
• VLLS mode wakeup due to RESET pin assertion — 0x41
• VLLS mode wakeup due to other wakeup sources — 0x01
• Other reset — a bit is set if its corresponding reset source
caused the reset
Address: 4007_F000h base + 0h offset = 4007_F000h
Bit 7 6 5 4 3 2 1 0
Read POR PIN WDOG 0 LOL LOC LVD WAKEUP
Write
Reset
1 0 0 0 0 0 1 0
RCM_SRS0 field descriptions
Field Description
7
POR
Power-On Reset
Indicates a reset has been caused by the power-on detection logic. Because the internal supply voltage
was ramping up at the time, the low-voltage reset (LVD) status bit is also set to indicate that the reset
occurred while the internal supply was below the LVD threshold.
0 Reset not caused by POR
1 Reset caused by POR
6
PIN
External Reset Pin
Indicates a reset has been caused by an active-low level on the external RESET pin.
0 Reset not caused by external reset pin
1 Reset caused by external reset pin
5
WDOG
Watchdog
Indicates a reset has been caused by the watchdog timer Computer Operating Properly (COP) timing out.
This reset source can be blocked by disabling the COP watchdog: write 00 to the SIM's COPC[COPT]
field.
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
Table continues on the next page...
Reset memory map and register descriptions
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
266 Freescale Semiconductor, Inc.
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