Table 84. Comp_Sm_3; Table 85. Comp_Sm_4 - ST STM32L4 Series User Manual

SM CODE
Multiple-fault protection
Recommendations and known limitations
SM CODE
Description
Ownership
Detailed implementation
Error reporting
Fault detection time
Addressed fault model
Dependency on Device configuration
Initialization
Periodicity
Test for the diagnostic
Multiple-fault protection
Recommendations and known limitations
SM CODE
Description
Ownership
Detailed implementation
Error reporting
Fault detection time
Addressed fault model
Dependency on Device configuration
Initialization
Periodicity
Test for the diagnostic
Multiple-fault protection
Recommendations and known limitations
UM2305 - Rev 10
CPU_SM_0: Periodic core self-test software
None
Table 84. COMP_SM_3
Multiple acquisition by Application software
End user
This method requires that Application software takes a decision not on the basis of a
comparator single-shot transition, but after multiple events or after the permanence of
comparator trigger conditions for a certain amount of time.
Depends on implementation
Depends on implementation
Transient
None
Depends on implementation
On demand
Not applicable
CPU_SM_0: Periodic core self-test software
It is highly probable that this recommendation is satisfied by design on End user application
- multiple acquisition is a common technique in industrial applications facing electromagnetic
interference on sensor lines.
Table 85. COMP_SM_4
Comparator lock mechanism
ST
This safety mechanism prevents configuration changes for comparator control and status
registers; it addresses therefore systematic faults in the software application.
Not applicable
Not applicable
None (Fault avoidance)
None
Lock protection must be enabled through the COMPxLOCK bits of the COMP_CSR register.
Continuous
Not applicable
Not applicable
This method does not addresses comparator configuration changes due to soft errors.
Hardware and software diagnostics
COMP_SM_2
COMP_SM_3
COMP_SM_4
UM2305
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