9the cable? Do you mean the cable shielding? If CAT5 had 9 cables, i would have include touch capability. Now I do plan on exploring a touch display and only using T_CS and MISO lines (attempt to ignore T_INT) , but i've got to find a display with tri-state MISO. I have tried ground the shielding and all hell broke lose, I guess it acted like a giant antenna conducting noise to my boards. I tried 1M resistors and caps on shielding--no luck. so i leave shielding totally unconnected. Since I can't use touch, i use push buttons--consuming the other 2 lines.
Attached is my schematic for the display
1. pullup (connected to 3v3) on CS is a real resistor on the MCU side of the cable--no need for INPUT_PULLUP
2. pullups (connected to 3v3) on SCK and MOSI are on the display side
3. note how i'm handling RESET. To save a cable (that I don't have) sometimes RESET connected directly to 3v3 will white screen the display. This "low pass" filter slows the change to RESET and is very reliable in firing up the display.
4. Hard wired LED, but you can alwasy connect to pot for varying the brightness
5. also some caps to help filter incoming power (caps on pushbuttons are my version of hardware debouncing--I still have software debouncing as well)
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