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DS89C450 code burning problem.

Bhai jagtap jagtap

Hello Everybody,

I have a EPROM programmer at my college. I wanted to burn code in my DS89C450 uC.
the programmer had only DS89C420. i checked the datasheet it says that the 2 IC's are pin compatible and applications using DS89C420 can be replaced with DS89C450. When i tried burning my code the programmer says " MANUFACTURER'S CODE NOT MATCHED". what does it mean and what should i do?

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