SM CODE ATIM_SM_3
Recommendations and known limitations
Efficiency versus transient failures is linked to final application characteristics. We define as
Tm the minimum duration of PWM wrong signal permanence (wrong frequency, wrong duty, or
both) required to violate the related safety function(s). Efficiency is maximized when execution
test frequency is higher than 1/Tm.
Table 111. ATIM_SM_4
SM CODE ATIM_SM_4
Description Lock bit protection for timers
Ownership ST
Detailed implementation
This safety mechanism allows End user to lock down specified configuration options, thus
avoiding unintended modifications by Application software. Therefore, it addresses software
development systematic faults.
Error reporting Not applicable
Fault detection time Not applicable
Addressed fault model None (Fault avoidance)
Dependency on Device configuration None
Initialization Lock protection must be enabled using LOCK bits in the TIMx_BDTR register.
Periodicity Continuous
Test for the diagnostic Not applicable
Multiple-fault protection Not applicable
Recommendations and known limitations This method does not address timer configuration changes due to soft errors.
Note: IRTIM is not individually mentioned here as its implementation is mostly based on general-purpose timer
functions. Refer to related prescriptions.
3.6.32 Basic timers (TIM6/7)
Table 112. GTIM_SM_0
SM CODE GTIM_SM_0
Description Periodic read-back of configuration registers
Ownership End user
Detailed implementation
This method must be applied to basic timer configuration registers.
Detailed information on the implementation of this method can be found in
Section 3.6.14 Extended interrupt and events controller (EXTI).
Error reporting Refer to NVIC_SM_0
Fault detection time Refer to NVIC_SM_0
Addressed fault model Refer to NVIC_SM_0
Dependency on Device configuration Refer to NVIC_SM_0
Initialization Refer to NVIC_SM_0
Periodicity Refer to NVIC_SM_0
Test for the diagnostic Refer to NVIC_SM_0
Multiple-fault protection Refer to NVIC_SM_0
Recommendations and known limitations Refer to NVIC_SM_0
UM2305
Hardware and software diagnostics
UM2305 - Rev 10
page 64/110
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