i could read address 0x82800 by this code :
mov R2,#0x2800 EXTS #8,#1 mov R1,[R2]
which R1 contains right answer .
but i cant write to this address with this code :
mov R1,0xffff mov R2,#0x2800 EXTS #8,#1 Mov [R2],R1
when i can read this location , why i can not write ? please help me.