Hello Vladimir, You wrote in a topic that, "I am doesn't work with mini2440 from the WinCE, but I have big experience with S3C6410 in my Windows Mobile smartphone, I am sure that it is all same". But here in Mini-6410, GPIO consists of two part, alive-part and off-part. In Alive-part power is supplied on sleep mode, but in off-part it is not the same. Therefore, the registers in alive-part can keep their values during sleep mode. And thats why I thing I am unable to access those port pins. Can You please guide me how to toggle those port pins? Or where I can find any sample program or related discussions, forums or anything related to this? Thanks in Advance. Sumeet Thakre