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Does a Mcp23s17 output pin keep the value after being unselected?
I'm designing a SPI based communiations circuit between Raspberry Pi4+B as a master and (n x 8) GPIO expander modules, as slaves. Concretely we have selected an MCP23S17 GPIO expander: Datasheet
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MCP23S17 - do I have to use both Chip Select and Hardware Addressing?
I've used MCP23S17 before. 6 of it and I just used Chip Select. Hardware address pins all 0.
https://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf
In datasheet, hardware addressing can be ...
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