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26.3.7 LLWU Pin Flag register (LLWU_PF)
LLWU_PF contains the wakeup flags indicating which wakeup source caused the MCU
to exit LLS or VLLS mode. For LLS, this is the source causing the CPU interrupt flow.
For VLLS, this is the source causing the MCU reset flow.
The external wakeup flags are read-only and clearing a flag is accomplished by a write of
a 1 to the corresponding WUFx bit. The wakeup flag (WUFx), if set, will remain set if
the associated WUPEx bit is cleared.
NOTE
This register is reset on Chip Reset not VLLS and by reset
types that trigger Chip Reset not VLLS. It is unaffected by reset
types that do not trigger Chip Reset not VLLS. See the
Address: 4006_1000h base + 20h offset = 4006_1020h
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
LLWU_PF field descriptions
Field
Description
31
WUF31
Wakeup Flag For LLWU_P31
Indicates that an enabled external wakeup pin was a source of exiting a low-leakage power mode. To
clear the flag write a one to WUF31.
0
LLWU_P31 input was not a wakeup source
1
LLWU_P31 input was a wakeup source
Table continues on the next page...
Chapter 26 Low-Leakage Wakeup Unit (LLWU)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
681
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