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P89C51RD2 unexpected reset

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ARoque

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Hi,

I’m using the P89C51RD2 for a while without any problem, but now I install 3 instruments in a Industrial factory and the 3 units having random reset or sometimes just freeze completely. My reset circuit is the regular RC suggested by NXP. Does any off you have similar problems?

Thanks.
 

you maybe miss a pullup somewhere

maybe the + supply is impure??? etc

try adding some ceramic caps into the standard circuit right at the mclr pin
to decouple imputrious stimuli from the reset vector
or add a small delay before i/o pins init
this often helps

main routine >>delay 1ms ...etc>>registers/pins init actual pins active...
 

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