Hi all,

I was working with my old product which has P89C51RD2 on the board. The programming and verification seems alright using flash magic but the chip is facing a continuous reset. when i looked in to the matter i found on internet (ref) which might be relevant. but here the code is not getting corrupted instead the continuous reset is occurring. ( I have not touched Watchdog related registers in code)

Regards,
Mihir.

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How P89C51RD2 get faulty durring programming with Flash magic
Please tell me how to protect them, as they are costly.
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Reply
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This sounds like the infamous bootvector loss problem.
You can find some additional background information searching 8052.com and the FlashMagic (forum.flashmagictool.com) forums.
One thing you should consider is a proper reset IC, if you don't use one already.
Other thing might be to use Erik Malund's idea - to add a code for bootloader entry into your application. Search under NoTouch/BackDoor on those two sites I mentioned above.
JW
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