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LPS22HBTR датащи(PDF) 19 Page - STMicroelectronics |
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LPS22HBTR датащи(HTML) 19 Page - STMicroelectronics |
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19 / 49 page ![]() DocID027083 Rev 5 19/49 LPS22HB FIFO 49 5.3 Stream mode Stream mode (FIFO_CTRL (14h)(FMODE2:0) = 010) provides continuous FIFO update: as new data arrive, the older is discarded. Once the entire FIFO has been read, the last data read remains in the FIFO and hence once a new sample is acquired, the FIFO_STATUS (26h)(FSS5:0) value rises from 0 to 2. An overrun interrupt can be enabled, CTRL_REG3 (12h)(F_OVR) = '1', in order to inform when the FIFO is full and eventually read its content all at once. If an overrun occurs, the oldest sample in FIFO is overwritten, so if the FIFO was empty, the lost sample has already been read. Figure 9. Stream mode In the latter case reading all FIFO content before an overrun interrupt has occurred, the first data read is equal to the last already read in the previous burst, so the number of new data available in FIFO depends on the previous reading. |
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