Hi, All the SP, STKOV, and STKUV's highest 4 bits are masked to '1'. Does that mean those registers have to be 0xFxxx only? May I change the system stack to somewhere else, say 0xc200? Thanks a lot.
The interesting thing is, Keil's simulator ties the 4 significant bits of SP/STKUN/STKOV to 1. That's what they get for reading the manual!