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Using EZ-USB Fx2 product with Mon51, there are debugging issues.

Hi, Sirs:
I use the Cypress EZ-USB Fx2 platform to develop programs, and debugging with the Mon51.
In this hardware platform, the totally XData area(0x0000-0xFFFF) can both be used as CODE and RAM space.
I am sure that my program is loaded at Code:0x8000-0xBFFF and XData:0xC000-0xFFFF space. The Mon51 is installed and executed at Code:0x00-0x17FF Data:0x1800-0x18FF by invoking

install.bat 5 18 0

.
The problem occurs when the program running to something like a

"mov R7, A"

instruction. The 8051 resets.
I eally don't know why this happens, colud you give me some suggestion, or is there any more detailed documentation on Mon51 that I can learn more? Thanks!
Regards,
Keith