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MCP23008-E/SS Datasheet(PDF) 14 Page - Microchip Technology |
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MCP23008-E/SS Datasheet(HTML) 14 Page - Microchip Technology |
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14 / 40 page  MCP23008/MCP23S08 DS21919B-page 14 © 2005 Microchip Technology Inc. 1.6.7 PULL-UP RESISTOR CONFIGURATION (GPPU) REGISTER The GPPU register controls the pull-up resistors for the port pins. If a bit is set and the corresponding pin is configured as an input, the corresponding port pin is internally pulled up with a 100 k Ω resistor. REGISTER 1-7: GPPU – GPIO PULL-UP RESISTOR REGISTER (ADDR 0x06) R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 PU7 PU6 PU5 PU4 PU3 PU2 PU1 PU0 bit 7 bit 0 bit 7-0 PU7:PU0: These bits control the weak pull-up resistors on each pin (when configured as an input) <7:0>. 1 = Pull-up enabled. 0 = Pull-up disabled. 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 |
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