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AN4504 数据表(PDF) 21 Page - STMicroelectronics |
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AN4504 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 41 page  DocID026419 Rev 1 21/41 AN4504 Interrupt generation 41 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 7) 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 8). Figure 7. Wait disabled Figure 8. Wait enabled • Wait bit = ‘0’ Interrupt disabled as soon as condition is no longer valid (ex: Rate value below threshold) Rate (dps) Rate Threshold 0 t(n) t(n) t(n) Interrupt Counter Duration Value “Wait” Disabled • Wait bit = ‘1’ Interrupt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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