3.6.8 Universal asynchronous receiver/transmitter (UART)
Table 40. UART_SM_0
SM CODE UART_SM_0
Description Periodical read-back of configuration registers
Ownership End user
Detailed implementation
This method must be applied to UART 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 41. UART_SM_1
SM CODE UART_SM_1
Description Protocol error signals
Ownership ST
Detailed implementation
USART communication module embeds protocol error checks (like additional parity bit check,
overrun, frame error) conceived to detect network-related abnormal conditions. These mechanisms
are able anyway to detect a marginal percentage of hardware random failures affecting the module
itself.
Error signals connected to these checkers are normally handled in a standard communication
software, so the overhead is reduced.
Error reporting Error flag raise and optional Interrupt Event generation
Fault detection time Depends on peripheral configuration (e.g. baud rate), refer to functional documentation
Addressed fault model Permanent and Transient
Dependency on MCU configuration None
Initialization Depends on implementation
Periodicity Continuous
Test for the diagnostic Not required
Multiple faults protection UART_SM_2: Information redundancy techniques on messages
Recommendations and known
limitations
USART communication module is fitted by several different configurations – the actual composition
of communication error checks depends on selected configuration
Table 42. UART_SM_2
SM CODE UART_SM_2
Description Information redundancy techniques on messages
UM1845
Description of hardware and software diagnostics
UM1845 - Rev 4
page 34/108
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