i m b building running message with pic and lcd 44780 do i have
to connect the rd/wr wire of lcd to ground or i it has to be connected to the pic as a contol pin. in other words if i want to run message on the lcd do i ought to read from the lcd.
Hi
You can connect it to ground. In ths case you should wait about 2 ms between successive commands. Of course reading from LCD will fast the execution but you will lose I/O pin and also you will need some careful coding
i have to wait whether the pin rd is connected or not for proper operation of the lcd.
i think i would connect it to rd because i m working with the picdem plus unit.
but i have onother question-why does the pic16f877a has 2 pins of vdd and 2 of vss ???? and do i have to connect them both to vdd (short them) ???