T89C51CC01 Atmel, T89C51CC01 Datasheet - Page 76
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T89C51CC01
Manufacturer Part Number
T89C51CC01
Description
Enhanced 8-Bit Microcontroller
Manufacturer
Atmel
Datasheet
1.T89C51CC01.pdf
(170 pages)
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Watchdog Programming
76
T89C51CC01
The three lower bits (S0, S1, S2) located into WDTPRG register permit to program the
WDT duration.
Table 52. Machine Cycle Count
To compute WD Time-Out, the following formula is applied:
Note:
The following table outlines the time-out value for Fosc
Table 53. Time-Out Computation
S2
0
0
0
0
1
1
1
1
S2
0
0
0
0
1
1
1
1
Svalue represents the decimal value of (S2 S1 S0)
S1
0
0
1
1
0
0
1
1
S1
0
0
1
1
0
0
1
1
FTime Out
S0
0
1
0
1
0
1
0
1
–
=
S0
0
1
0
1
0
1
0
1
---------------------------------------------------------------- -
12
Fosc = 12 MHz
131.07 ms
262.14 ms
524.29 ms
16.38 ms
32.77 ms
65.54 ms
×
1.05 s
2.10 s
(
(
2
14
F
×
wd
2
Svalue
XTAL
Fosc = 16 MHz
Machine Cycle Count
) 1
196.56 ms
393.12 ms
786.24 ms
12.28 ms
24.57 ms
49.14 ms
98.28 ms
–
1.57 s
= 12 MHz in X1 mode
)
2
2
2
2
2
2
2
2
14
15
16
17
18
19
20
21
- 1
- 1
- 1
- 1
- 1
- 1
- 1
- 1
Fosc = 20 MHz
4129K–CAN–01/05
157.28 ms
314.56 ms
629.12 ms
19.66 ms
39.32 ms
78.64 ms
9.82 ms
1.25 s
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