when I use big arrays, i get problem...

Hi,

I am using AT89C51rd2. When I use big arrays like abc[270] and def[274] in my code, nothing works correct. But i use abc[40] and def[40], every thing is ok.

when abc[270] and def[274] declared, keil generates:

Program Size: data=109.1 xdata=1159 code=12696

when abc[40] and def[40] declared, keil generates:

Program Size: data=109.1 xdata=695 code=12461

In options, "use on-chip xram" is checked. I tried to set AUXR resiter in firmware like XRS0=0,XRS1=0,XRS2=1 to select "software selectable" xram size as 1792. Nothing is work....

What can be the problem???

Thanks...