Hi GuenterL,
Thanks for your answer. However, the case I met may not as you said. 0xAF bits 7,4 will be changed by the controller
on my board. For the bit 1, it may not. I didn't see. But, each time, I set the bit 1, it would response late. I normally
have to set several times. Is it correct? I doubt something wrong on my board. If you are right, I think we need to
check the board. Many thanks.
Regards,
Peter