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T89C51CC02CA-RATIM Folha de dados(PDF) 70 Page - ATMEL Corporation

Nome de Peças T89C51CC02CA-RATIM
Descrição Electrónicos  Enhanced 8-bit Microcontroller with CAN Controller and Flash
PDF  159 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
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70
AT/T89C51CC02
4126L–CAN–01/08
Watchdog Programming
The three lower bits (S0, S1, S2) located into WDTPRG register permit to program the
WDT duration.
Table 50. Machine Cycle Count
To compute WD Timeout, the following formula is applied:
Note:
Svalue represents the decimal value of (S2 S1 S0)
Find Hereafter computed Timeout values for f
OSCXTAL = 12 MHz in X1 mode
Table 51. Timeout Computation
S2
S1
S0
Machine Cycle Count
00
0
2
14 - 1
00
1
2
15 - 1
01
0
216 - 1
01
1
2
17 - 1
10
0
2
18 - 1
10
1
219 - 1
11
0
220 - 1
11
1
2
21 - 1
S2
S1
S0
fOSC=12 MHz
fOSC=16MHz
fOSC=20 MHz
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 s
FTime
Out
F
osc
62
×
WD X2
X2
∧
2
14
2
Svalue
×
()
-----------------------------------------------------------------------------
=
–



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