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ST9 データシート(PDF) 69 Page - STMicroelectronics

部品番号 ST9
部品情報  USER GUIDE
PDF  146 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST9 データシート(HTML) 69 Page - STMicroelectronics

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ST9 USER GUIDE
reload it with its initial value. You select these modes using three bits in the WDT Control Reg-
ister, as follows:
4.3.1.1 Event Counter Mode
The counter value is decremented at each falling edge on the WDTIN pin if ST_SP is high (bit
7 of WDTCR).
Figure 28
. Timer in Event Counter Mode
4.3.1.2 Gated Input Mode
The counter value is decremented by WDTCLK (INTCLK / 4) if the WDTIN pin and ST_SP are
high.
Figure 29
. Timer in Gated Input Mode
INEN
INMD1
INMD2
Mode
1
0
0
Event counter mode
1
0
1
Gated mode
1
1
1
Retriggerable input mode
1
1
0
Triggerable input mode
0
X
X
Input section disabled. Internal clock selected.
WDTIN Pin
ST_SP
Counter
Value
WDTIN Pin
ST_SP
Counter
Value



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