Rainbow-electronics ATmega163L Manuel d'utilisateur télécharger pdf (Page 52)

ATmega163(L)

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Bits 2..0 - WDP2, WDP1, WDP0: Watchdog Timer Prescaler 2, 1, and 0

The WDP2, WDP1, and WDP0 bits determine the Watchdog Timer prescaling when the Watchdog Timer is enabled. The

different prescaling values and their corresponding Timeout Periods are shown in Table 23.

Table 23. Watch Dog Timer Prescale Select

WDP2 WDP1 WDP0

Number of

WDT Oscillator Cycles

Typical Time-out

at V

= 3.0V

Typical Time-out

at V

= 5.0V

0 0 0 16K cycles 47 ms 15 ms

0 0 1 32K cycles 94 ms 30 ms

0 1 0 64K cycles 0.19 s 60 ms

0 1 1 128K cycles 0.38 s 0.12 s

1 0 0 256K cycles 0.75 s 0.24 s

1 0 1 512K cycles 1.5 s 0.49 s

1 1 0 1,024K cycles 3.0 s 0.97 s

1 1 1 2,048K cycles 6.0 s 1.9 s

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 155 156

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Rainbow-electronics ATmega163L Manuel d'utilisateur Page 52