3.6.15 Advanced, general and low-power timers TIM1/2/3/4/5/8/9/10/11/12/13/14
Note: As the timers are equipped with many different channels, each independent from the others, and possibly
programmed to realize different features, the safety mechanism is selected individually for each channel.
Table 67. ATIM_SM_0
SM CODE ATIM_SM_0
Description Periodical read-back of configuration registers
Ownership End user
Detailed implementation
This method must be applied to advanced, general and low-power timers
TIM1/2/3/4/5/8/9/10/11/12/13/14 configuration registers.
Detailed information on the implementation of this method can be found in Section 3.6.5
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 MCU 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 faults protection Refer to NVIC_SM_0
Recommendations and known limitations Refer to NVIC_SM_0
Table 68. ATIM_SM_1
SM CODE ATIM_SM_1
Description 1oo2 for counting timers
Ownership End user
Detailed implementation
This method implements via software a 1oo2 scheme between two counting resources.
The guidelines for the implementation of the method are the following:
• Two timers are programmed with same time base or frequency.
• In case of timer use as a time base: use in the application software one of the timer as time base
source, and the other one just for check. Coherence check for the 1oo2 is done at application level,
comparing two counters values each time the timer value is used to affect safety function.
• In case of interrupt generation usage: use the first timer as main interrupt source for the service
routines, and use the second timer as a “reference” to be checked at the initial of interrupt routine
Error reporting Depends on implementation
Fault detection time Depends on implementation
Addressed fault model Permanent and Transient
Dependency on MCU
configuration
None
Initialization Depends on implementation
Periodicity On demand
Test for the diagnostic Not needed
Multiple faults protection CPU_SM_0: periodical core self-test software
UM1845
Description of hardware and software diagnostics
UM1845 - Rev 4
page 49/108
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