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23017 Datasheet(PDF) 22 Page - Microchip Technology |
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23017 Datasheet(HTML) 22 Page - Microchip Technology |
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22 / 48 page  MCP23017/MCP23S17 DS21952B-page 22 © 2007 Microchip Technology Inc. 1.6.10 PORT REGISTER The GPIO register reflects the value on the port. Reading from this register reads the port. Writing to this register modifies the Output Latch (OLAT) register. REGISTER 1-10: GPIO – GENERAL PURPOSE I/O PORT REGISTER (ADDR 0x09) R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 GP7 GP6 GP5 GP4 GP3 GP2 GP1 GP0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-0 GP7:GP0: These bits reflect the logic level on the pins <7:0> 1 = Logic-high. 0 = Logic-low. |
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