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AN4504 датащи(PDF) 21 Page - STMicroelectronics

номер детали AN4504
подробное описание детали  This document is intended to provide usage information
PDF  41 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN4504 датащи(HTML) 21 Page - STMicroelectronics

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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is no longer valid (ex: Rate value below threshold)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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