Rainbow-electronics T89C51AC2 Manual de usuario descargar pdf (Pagina 66)

T89C51AC2

Rev. B – 19-Dec-01

14.1 WatchDog

Programming

The three lower bits (S0, S1, S2) located into WDTPRG register permit to program the

WDT duration.

Table 32. Machine Cycle Count

To compute WD Time-Out, the following formula is applied:

Note: Svalue represents the decimal value of (S2 S1 S0)

The following table describes the computed Time-Out value for Fosc

XTAL

=12MHzinX1

mode

Table 33. Time-Out Computation

S2 S1 S0 Machine Cycle Count

000 2

-1

001 2

-1

010 2

-1

011 2

-1

100 2

-1

101 2

-1

110 2

-1

111 2

-1

S2 S1 S0 Fosc=12MHz Fosc=16MHz Fosc=20MHz

0 0 0 16.38 ms 12.28 ms 9.82 ms

0 0 1 32.77 ms 24.57 ms 19.66 ms

0 1 0 65.54 ms 49.14 ms 39.32 ms

0 1 1 131.07 ms 98.28 ms 78.64 ms

1 0 0 262.14ms 196.56ms 157.28ms

1 0 1 524.29ms 393.12ms 314.56ms

1 1 0 1.05 s 786.24 ms 629.12 ms

1 1 1 2.10 s 1.57 s 1.25 ms

FTime Out

12 2

Svalue

×()1–()×

-------------------------------------------------------------------

=–

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 109 110

T89C51AC2 1

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Rainbow-electronics T89C51AC2 Manual de usuario Pagina 66

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