Oleg wrote:
Sorry, not clear. Where are the constants in case of xdata? As far as
see code constants are formed in time of compilation by PC(a byte takes
size of byte), but "constants" stored at xram requires some bytes of
an instruction(that contains this data byte too) to move it to RAM. Am
I not right?

I have no idea what I was thinking when I wrote my response. Of course you are right. I had a brain cramp at the time and I hope you forgive me!
Allen