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L9680 データシート(PDF) 197 Page - STMicroelectronics |
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L9680 データシート(HTML) 197 Page - STMicroelectronics |
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197 / 277 page  DocID029257 Rev 1 197/277 L9680 Safing logic 276 12.2 SPI sensor data decoding Sensor data is regularly communicated with the main microcontroller through multiple SPI messages. The L9680 monitors SPI traffic on MISO_RS bus. Since not all communications between sensors and the microcontroller contain data, it is important for the decoder to properly sort the communications and extract only the targeted data. The solution involves defining specific masking functions, contained within independent safing records, programmed by the user. The following figures detail the SPI message decoding methodology and the ensuing comparisons of valid sensor data to the programmed thresholds. Figure 51. Safing engine – 32-bit message decoding flow chart |
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