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ST9 Datasheet(PDF) 70 Page - STMicroelectronics

Part # ST9
Description  USER GUIDE
PDF  146 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST9 Datasheet(HTML) 70 Page - STMicroelectronics

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ST9 USER GUIDE
4.3.1.3 Retriggerable Input Mode
The counter value is decremented by WDTCLK (INTCLK / 4) if ST_SP is high.
The initial value is reloaded either at the rising edge of ST_SP or at each falling edge of the
WDTIN pin if ST_SP is high.
Figure 30
. Timer in Retriggerable Input Mode
4.3.1.4 Triggerable Input Mode
The counter value is decremented by WDTCLK (INTCLK / 4) if ST_SP is high and falling edge
of WDTIN occurs.
The initial value is reloaded at the first falling edge of the WDTIN pin if ST_SP is high.
Figure 31
. Timer in Triggerable Input Mode
Initial Value
WDTIN Pin
ST_SP
Counter
Value
Counter
Value
Initial Value
ST_SP
WDTIN Pin



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