Sorry for OT, but I in big trouble!
From time to time my devices with above mentioned processors corrupt content of internal program memory. Does anyone see this behavior od 80C51ED2?
Dozsa Gyoergy
P.S. Keil C51 user since '91
It this a problem specific to 51s (as suggested above) due to a design flaw? no, it applies to all flash based micros.
the 'design flaw' is not realizing the situation at power down by the developer, not the chipmaker.
Erik