My controller is 7920IC. What are the pins define when it working in a 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.