AT89C51ED2-RDTIM datasheet(48/137 Pages) ATMEL

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AT89C51ED2-RDTIM 数据表(PDF) 48 Page - ATMEL Corporation

48 / 137 page

AT89C51RD2/ED2

4235E–8051–04/04

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 mod-

ules 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 appli-

cations the first solution is the best option.

This watchdog timer won’t generate a reset out on the reset pin.

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