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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72325AR7-Auto датащи(PDF) 82 Page - STMicroelectronics |
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ST72325AR7-Auto датащи(HTML) 82 Page - STMicroelectronics |
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82 / 243 page  Obsolete Product(s) - Obsolete Product(s) Watchdog timer (WDG) ST72325xxx-Auto 82/243 Doc ID 13770 Rev 3 Figure 33. Watchdog block diagram 10.4 How to program the watchdog timeout Figure 34 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 35. Caution: When writing to the WDGCR register, always write 1 in the T6 bit to avoid generating an immediate reset. Figure 34. Approximate timeout duration RESET WDGA 6-BIT DOWNCOUNTER (CNT) fOSC2 T6 T0 WDG PRESCALER WATCHDOG CONTROL REGISTER (WDGCR) DIV 4 T1 T2 T3 T4 T5 12-BIT MCC RTC COUNTER MSB LSB DIV 64 0 6 11 MCC/RTC TB[1:0] bits (MCCSR Register) 5 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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