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PDATA and XDATA

If I use PDATA for my Stack. will any of my XDATA overlap? or is Keil smart enough to prevent that? Does it mean the RAM(XDATA) I have is 2048 - 256 for pdata?

MCU: AT89C51CC03
Memory Model: Compact

PBPSTACK EQU 1
PBPSTACKTOP EQU 0xFF +1

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