I had a problem in a graphic LCD( processors KS 0108 or HD 61202), in my assembler code, when wrote in the LCD, the data displayed don't correspond the real data wrote. As if possessed acquired spurious in the data bus.
Ex:

real = mov p3,#11111111B,
setb E
nop
clr E

Error = Display 01011111

Can you help me ?

Thank you,