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error message "clock is not working"

Siva S

Hi,

I am trying to use large memory model" with AT89C51RD2. I have written a simple UART code and trying to debug the code with the simulator. Once, the code enter into the ISR the following error message comes up "Clock is not working"

And when using small memory model the error didn't pop up.
Could anyone pleas let me know what is the reason behind this error message when using the large memory model.

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