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AT89C51ED2-RDTUM Datasheet(PDF) 47 Page - ATMEL Corporation

Part # AT89C51ED2-RDTUM
Description  8-bit Flash Microcontroller
PDF  137 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTUM Datasheet(HTML) 47 Page - ATMEL Corporation

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4235K–8051–05/08
AT89C51RD2/ED2
The first two options are more reliable because the watchdog timer is never disabled as in option
#3. If the program counter ever goes astray, a match will eventually occur and cause an internal
reset. The second option is also not recommended if other PCA modules are being used.
Remember, the PCA timer is the time base for all modules; changing the time base for other
modules would not be a good idea. Thus, in most applications the first solution is the best option.
This watchdog timer won’t generate a reset out on the reset pin.



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