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T89C5115-RATIM Scheda tecnica(PDF) 68 Page - ATMEL Corporation

Il numero della parte T89C5115-RATIM
Spiegazioni elettronici  Low Pin Count 8-bit Microcontroller with A/D Converter and 16 KBytes Flash Memory
PDF  113 Pages
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C5115-RATIM Scheda tecnica(HTML) 68 Page - ATMEL Corporation

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68
AT89C5115
4128G–8051–02/08
Watchdog Programming
The three lower bits (S0, S1, S2) located into WDTPRG register permit to program the
WDT duration.
Table 49. 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 fOSCXTAL = 12 MHz in X1 mode
Table 50. Timeout Computation
S2
S1
S0
Machine Cycle Count
0
0
0
214 - 1
0
0
1
215 - 1
0
1
0
216 - 1
0
1
1
217 - 1
1
0
0
218 - 1
1
0
1
219 - 1
1
1
0
220 - 1
1
1
1
221 - 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
o sc
6
2
×
WD X
2
X
2
∧
2
14
2
Sva lu e
×
(
)
-----------------------------------------------------------------------------
=
–



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