Table 29. LOCK_SM_0
SM CODE LOCK_SM_0
Description Lock mechanism for configuration options
Ownership ST
Detailed implementation
The STM32F2 Series MCUs feature spread protection to prevent unintended configuration changes
for some peripherals and system registers (for example PVD_LOCK, timers); the spread protection
detects systematic faults in software application. The use of this method is encouraged to enhance
the end application robustness to systematic faults
Error reporting Not generated (when locked, register overwrites are just ignored)
Fault detection time NA
Addressed fault model None (Systematic only)
Dependency on MCU configuration None
Initialization Depends on implementation
Periodicity Continuous
Test for the diagnostic Not needed
Multiple faults protection Not needed
Recommendations and known limitations No DC associated because this test addresses systematic faults
UM1845
Description of hardware and software diagnostics
UM1845 - Rev 4
page 26/108
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