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AN4505 数据表(PDF) 23 Page - STMicroelectronics |
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AN4505 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 43 page  DocID026441 Rev 1 23/43 AN4505 Interrupt generation 43 The WAIT bit of the INT1_DURATION register has the following meaning: Wait = ‘0’: the interrupt falls immediately if the signal crosses the selected threshold (Figure 10) Wait = ‘1’: if the signal crosses the selected threshold, the interrupt falls only after the duration has counted the number of samples at the selected data rate, written into the duration counter register (Figure 11). Figure 10. Wait disabled Figure 11. Wait enabled • Wait bit = ‘0’ Interrupt disabled as soon as condition is no longer valid (ex: Rate value below threshold) Rate (dps) Rate Threshold 0 t(n) t(n) t(n) Interrupt Counter Duration Value “Wait” Disabled • Wait bit = ‘1’ Interrupt disabled after duration sample (sort of hysteresis) Rate (dps) Rate Threshold 0 t(n) t(n) t(n) Interrupt Counter Duration Value “Wait” Enabled Duration value is the same used to validate interrupt |
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