Could anyone please tell me may I connect 100mA hitachi compatible LCD to STK500? I know how to connect it (4-bit mode), but I do not know if I can drive enough mA to LCD. I found only in one place in STK500 help that it can drive 500mA, but it is not very clear. I guess that someone has tried this, so please let me know before I burn something. And yes, I am a newbie :) Forgive me for english, but I follow this forum with Google online translator and I do not know german. THANKS!
Hi Avra, normaly you dont need 500mA for a display. If the display has a LED backlight turn it off. The backlight needs 99% of the current. If you use the display in 4 Bit mode you only need 7 port bits, in 8 bit mode you need 11 port bits. So if you have enough ports you can use the 8 bit mode. In 8 bit mode connect the 8 data bits from the display to one port of the controller, the other pins from the display to free port pins. The only difference between 4 and 8 bit mode is simple. If you want to use 4 bit mode you first have to send a command to tell the display to switch in 4 bit mode and you must send all command in two nibble (4 bit). I hope this will help you a little bit. Best regards Markus