![]() 09h - Read Display Status) set RD from HIGH to LOW, so ILI9341 outputs data until RD returns HIGH. To read a byte from ILI after sending a read command (e.g. ILI9341 interpretes input byte as command (if RS=0) or as data/parameter (RS=1). CS pin has to be LOW during the communication, WR rising from LOW to HIGH tells to ILI to read byte on data pins. You have first to send a command to ILI and then write or read data/parameters. It drives the display and has nothing to do with touchscreen (Although the shield connects some pins of ILI9341 together with pins of the touchscreen). ![]() ILI9341 is integrated inside the display. ILI's RESET goes to pin to Arduino analog pin A4.CS (chip select) to A3. The shield connects ILI9341's data pins 0-7 to Arduino digital pins 2-8 (allowing parallel communication, not SPI). Colorful, 18-bit 262,000 different shades4-wire resistive touchscreen8 bit digital interface, plus 4 control lines
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