--- In [email protected], "ssmtux" <[EMAIL PROTECTED]> wrote: > > Hello, > > I'm newbe in this forum and at first tahnks for any suggestion... > I'm evelauting if buy the fox board, in fact I would connect to this > one a disply with Hd44780 controller (or T6369C controller) > I read the application on the acmesystems web site and I saw that they > use only 4 bit, why? Does the fox board drive 8 bits? > > Do you try the controller T6369C or an OLED display? > > thank you! > > s. >
If you read the spec of the HD44780 (or a similar device), you will see that it's also possible to control the LCD display using only 4 bits. One of the possible reasons to take that decision, is to have more pins left for other things. Sure, the FoxBoard drives 8 bits. And even more. It has, next to other ports, Port A which is solely IO. But using the FoxBoard directly to control a simple LCD is a very expensive system architecture choice. You'd better use, for instance, an I2C driven device (IO expander type of device) that only uses 2 pins of the FoxBoard, but allows you to connect the outputs of the IO expander to the LCD display. To me, that's a much better approach. Bet rgds, --Geert
