Hi all !

I realized and tested with Isis that, the given subrotine, called " WAIT_LCD" in the " Introduction to LCD Programmming" article, doesn't work.

The working subroutine should be like this :


WAIT_LCD:

SETB RW ;It's a read command
SETB EN
MOV P3,#0FFh ;Set all pins to FF initially
MOV A,P3 ;Read the return value
CLR EN
JB ACC.7,WAIT_LCD ;If bit 7 high, LCD still busy
CLR RW ;Turn off RW for future commands
RET

Best Regards!!