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, connect the PSB to GND first.
WG14432A : PSB Jump as the diagram, we need to open the R10, make R11 shorted. Then it will become SPI mode. And then, RS become CS and R/W become SID, E becomes SCLK.