Getting an 8-bit LCD display interface to work
The link 2.8" TFT LCD states that LCD part number is HY-TFT280 which has ILI9331 controller Inside. This LCD is interfaced with 16bit data interface with the help of ILI9331 controller inside on TCON Board.If you want to make it 8-Bit interfaced then you have to open the LCD Module which will be having a TCON board, In that board you have to find out the IM [0-3] Pin and you have to make it Pull Up or Pull down for 8-Bit Mode as suggested in the datasheet (But I am not sure whether it will work on 8-Bit interface, since only these pins are not responsible for making a LCD to switch between 16 to 8 Bit or some other Data Bit interface).

IM [0-3] Pins belongs to controller ILI9331 not to the LCD Connector so it is not shown in the 40 Pin connector schematic. Since these pins are not in the control of user.