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Default address of MCP23017
Source position: mcp23017.pas line 44
const MCP23X17_DEFAULT_ADDRESS = %01000000; |
This is the default address of a bunch of GPIO extenders like the MCP23017, MCP23S17, MCP23018 and MCP23S18. You have to bias the chip's address by connecting the address pin(s) to GND or VCC. See your chip's datasheet for more information.