ST SPC560P34 - Figure 438. Fault Flag Register (FCU_FFR); Table 402. FCU_FFR Field Descriptions; Table 403. Hardware;Software Fault Description

Fault Collection Unit (FCU) RM0046
762/936 Doc ID 16912 Rev 5
Notice that software recoverable fault flags must be kept high also if the relative signal does
not show anymore a fault. Hardware recoverable fault flags are updated in real time. Reset
requests are assumed as hardware-recoverable.
In order to clear a flag in the FCU_FFR via software, the application should access first time
the Key Register (FCU_KR) by writing the value of a key (0x618B_7A50) second time
resetting the appropriate flag. The following errors are ignored:
● Wrong key inserted in FCU_KR
● Attempt to clear a hardware recoverable flag
If user software tries to clear an already cleared software-recoverable flag, SRF0 is set.
In addition to the detailed field descriptions in Table 402, Table 403 provides the
hardware/software fault descriptions.
Figure 438. Fault Flag Register (FCU_FFR)
Address: Base + 0x0004 Access: User read/write, Supervisor read/write
0123456789101112131415
R
SRF
0
SRF
1
SRF
2
SRF
3
SRF
4
00000000000
W
Reset0000000000000000
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
HRF
15
HRF
14
HRF
13
HRF
12
HRF
11
HRF
10
HRF
9
HRF
8
HRF
7
HRF
6
HRF
5
HRF
4
HRF
3
HRF
2
HRF
1
HRF
0
W
Reset0000000000000000
Table 402. FCU_FFR field descriptions
Field Description
0:4
SRF0–
SRF4
Software Recoverable Fault [0:4]
0: No error latched
1: Error latched
16:31
HRF15–
HRF0
Hardware Recoverable Fault [15:0]
0: No error latched
1: Error latched
Table 403. Hardware/software fault description
Label Module Fault type
HRF0 Core Checkstop mode entered
HRF1 Core z0h core reset output
HRF2 CMU_0 Loss of crystal
HRF3 FMPLL_0 Loss of lock
HRF4 CMU_0 Frequency out of range