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ST7SB20J/US 데이터시트(PDF) 47 Page - STMicroelectronics

부품명 ST7SB20J/US
상세설명  8-BIT MCU WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFACE
PDF  154 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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WATCHDOG TIMER (Cont’d)
10.1.4 How to Program the Watchdog Timeout
Figure 29 shows the linear relationship between
the 6-bit value to be loaded in the Watchdog Coun-
ter (CNT) and the resulting timeout duration in mil-
liseconds. This can be used for a quick calculation
without taking the timing variations into account. If
more precision is needed, use the formulae in Fig-
ure 30.
Caution: When writing to the WDGCR register, al-
ways write 1 in the T6 bit to avoid generating an
immediate reset.
Figure 29. Approximate Timeout Duration
Watchdog timeout (ms) @ 8 MHz. fOSC2
3F
00
38
128
1.5
65
30
28
20
18
10
08
50
34
18
82
98
114
1



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