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ST72361AR4-Auto bảng dữ liệu(PDF) 82 Page - STMicroelectronics

tên linh kiện ST72361AR4-Auto
Giải thích chi tiết về linh kiện  Clock, reset and supply management
PDF  279 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72361AR4-Auto bảng dữ liệu(HTML) 82 Page - STMicroelectronics

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Window watchdog (WWDG)
ST72361xx-Auto
82/279
Doc ID 12468 Rev 3
9.4
Using halt mode with the WDG
If Halt mode with Watchdog is enabled by option byte (no watchdog reset on HALT
instruction), it is recommended before executing the HALT instruction to refresh the WDG
counter, to avoid an unexpected WDG reset immediately after waking up the microcontroller.
9.5
How to program the watchdog timeout
Figure 35 shows the linear relationship between the 6-bit value to be loaded in the
Watchdog Counter (CNT) and the resulting timeout duration in milliseconds. This can be
used for a quick calculation without taking the timing variations into account. If more
precision is needed, use the formulae in Figure 36.
Caution:
When writing to the WDGCR register, always write 1 in the T6 bit to avoid generating an
immediate reset.
Figure 35.
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



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