The controller is 7920IC. What are the pins define when it working on SPI mode?
We take WG14432A as an example. If we choose SPI mode, first connect the PSB to GND.
WG14432A : PSB Jump as the diagram. Only need to open the R10, make R11 shorted. Then it become SPI mode. So now, RS become CS, R/W become SID, E becomes SCLK.