System Reset Status Register 0 (Rcm_Srs0) - NXP Semiconductors MKL27Z128VFM4 Reference Manual

Reset memory map and register descriptions
Absolute
address
(hex)
4007_F006 Force Mode Register (RCM_FM)
4007_F007 Mode Register (RCM_MR)
4007_F008 Sticky System Reset Status Register 0 (RCM_SSRS0)
4007_F009 Sticky System Reset Status Register 1 (RCM_SSRS1)

22.2.1 System Reset Status Register 0 (RCM_SRS0)

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.
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
Read POR
Write
Reset 1
Field
7 Power-On Reset
POR
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 External Reset Pin
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
326
RCM memory map (continued)
Register name
NOTE
6 5
PIN WDOG
0 0
RCM_SRS0 field descriptions
Table continues on the next page...
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Width
Access
(in bits)
8 R/W
8 R/W
8 R/W
8 R/W
4 3
0
0 0
Description
Section/
Reset value
page
00h 22.2.5/331
See section 22.2.6/331
82h 22.2.7/332
00h 22.2.8/333
2 1
0 LVD WAKEUP
0 1
Freescale Semiconductor, Inc.
0
0