I try writing "NO" in the LCD using 4-bit mode. So, I programmed the AT89S52 to send the upper nibble first to the last 4 data inputs of the LCD. I used AND operation to eliminate the lower nibble. Afterwards, I cleared the RS bit and send a HIGH-TO-LOW enable pulse. The same code for the lower...
Hi guys,
I'm kinda stuck with this code, it compiles without errors but I can't debugg it to know why it is not executing the part where it accepts passwords during simulation on proteus.
What's it supposed to do? Turn off LEDs on port A when passcode is inputed. I've attached the proteus...