hi,

here are some suggestions: http://www.8052.com/forum/read.phtml?id=75312
Please read that thread completely as well - it has alot of interest information.

i haven't checked the frequency, but current is sure

What do you mean when say "i haven't checked the frequency"? Are you not able to calculate refresh speed looking at the program? Do you not know how often refresh routine is called and how is it long?

Regards,
Oleg