When using ViSi Genie or Serial (SPE) and turning the display into a slave device / secondary device, the host controller requires to have:

• 1 UART peripheral – provides ViSi Genie and Serial (SPE) communication between the host and the display
• 1 digital output pin – controls the reset pin of the display module

Keep in mind that the display pins are 3.3V with most of the pins being 5V tolerant. Please refer to the datasheets for more information.