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STACK check

Hi there, Iam using LPC2368 controller and Keil uVision3 IDe with the GNU compiler. I would like to know regarding the usage of
Generate Stack Check Code option under Compiler menu of the Keil IDE.

I have observed the following in the startup.s file

#  Setup a default Stack Limit (when compiled with  "-mapcs-stack-check")
                SUB     SL, SP, #USR_Stack_Size

Is there an example/link/user guide demonstrating it's usage.

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