PCA9556 is a port expander and not a shift register.
Which Nokia display?
The common Nokia displays are SPI. You can bit-bang the SPI via the port expander. But you might just as well write directly to the SPI.
David.
PCA9556 is a port expander and not a shift register.
Which Nokia display?
The common Nokia displays are SPI. You can bit-bang the SPI via the port expander. But you might just as well write directly to the SPI.
David.