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Giải thích chi tiết về linh kiện  Guidelines for obtaining IEC 60335 Class B certification for any STM32 application
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Class B solution structure
AN3307
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Doc ID 18186 Rev 4
measurement to be performed in the SysTick interrupt service routine. The
SysTick_Handler() interrupt service counts ticks and performs short partial transparent
RAM March C or March X checks at correct intervals (20 ms) when a flag (TimeBaseFlag) is
set to synchronize the rest of the runtime checks called from the main level. The
FailSafePOR() routine itself is described in Section 4.1.1: Fail Safe mode.
5.2
Description of startup self tests
The startup self-tests should be run during the initialization phase as the first check
performed after resetting the micro (see Figure 5). This is done by forcing the reset vector to
the address the start of the STL_StartUp() routine. The structure of the block of startup
tests structure is shown in Figure 6 and it includes the following self tests:
●
CPU startup test
●
Watchdog startup tests
●
Flash complete checksum test
●
Full RAM March C/X test
●
Clock startup test
●
Control flow check
These blocks are described in more detail further in this section.
Figure 6.
Startup self tests structure
MS18593V1
RESET
Watchdogs self-test
Switch PLL ON
Flash integrity check
RAM functional check
Clock frequency check
Control Flow check
Resume C startup
Fail Safe routine
Fail
Fail
Fail
Fail
HW Reset
CPU core self-test
Fail
Switch PLL Off



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