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How to see the Stack variable what SP and SPMAX?
C51 doesn't use the stack for variables!
"what SP and SPMAX?"
where did you see them mentioned?
If you observe the Regs window in the debug mode you will find the ""spx" and "sp_max"
Did it occur to you to try putting "sp_max" into the 'Search' box...?
http://www.keil.com/support/docs/192.htm