Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 65)

Rev.A - May 17, 2001 65

Preliminary

T89C51CC02

14.2. WatchDog Programming

The three lower bits (S0, S1, S2) located into WDTPRG register permits to program the WDT duration.

Table 18. Machine Cycle Count

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

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

Find Hereafter computed Time-Out value for Fosc

XTAL

= 12MHz

Table 19. 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 0 262.14 ms 196.56 ms 157.28 ms

1 0 1 524.29 ms 393.12 ms 314.56 ms

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

XTAL

12 2

Svalue

×()1–()×

-------------------------------------------------------------=–

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 136 137

T89C51CC02 1

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Rainbow-electronics T89C51CC02 Manual de usuario Pagina 65

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