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AN4266 数据表(PDF) 23 Page - STMicroelectronics |
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AN4266 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 76 page  AN4266 Functional safety requirements for application software Doc ID 024283 Rev 2 23/76 Note: Rationale: To minimize CCF Safety Integrity Functions The safety integrity is achieved by duplicate reads and software comparison by the processing function (See Figure 3). Mandatory: The application software must implement the following tests: ● ETIMER0_SWTEST_REGCRC ● ETIMER1_SWTEST_REGCRC ● SIUL_SWTEST_REGCRC Note: Rationale: To verify that the configuration of the modules used by this safety function compare with what is expected Rationale: To avoid CCF caused by improper configuration of the pads Mandatory: The application software must implement the test ENCI_SWTEST_CMP, which compares signals acquired from each channel. Note: Rationale: To verify that the two sets of data compare Figure 3. Double encoder read input eTimer_0 I ETC[x] eTimer_1 I ETC[y] Encoder Input Double Read Configuration SIUL I I EIRQ[x] EIRQ[y] I = Input Pad |
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