IO Expander

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Based on the MCP23008 (I2C) or MCP23S08 (SPI) IO expander chips from Microchip.
http://ww1.microchip.com/downloads/en/DeviceDoc/21919e.pdf

I2C address:
0100 000 tru 0100 111

SPI address:
0100 000 tru 0100 011

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