App note from FTDI on interfacing the FT800 with an ARM MCU . Link is here
The FTDI FT800 video controller offers a high quality, high value solution for embedded graphics requirements. In addition to the graphics, resistive touch inputs and an audio output provide a complete human machine interface to the outside world.
This application note will provide a simple example of developing ARM C code to control the FT800 over SPI. The principles demonstrated can then be used to produce more complex applications.