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MCP23009TESS 数据表(PDF) 17 Page - Microchip Technology |
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MCP23009TESS 数据表(HTML) 17 Page - Microchip Technology |
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17 / 50 page  © 2009 Microchip Technology Inc. DS22121B-page 17 MCP23009/MCP23S09 1.6.2 INPUT POLARITY REGISTER This register allows the user to configure the polarity on the corresponding GPIO port bits. If a bit is set, the corresponding GPIO register bit will reflect the inverted value on the pin. REGISTER 1-2: IPOL – INPUT POLARITY PORT REGISTER R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0 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 IP7:IP0: Controls the polarity inversion of the input pins <7:0> 1 = GPIO register bit will reflect the opposite logic state of the input pin 0 = GPIO register bit will reflect the same logic state of the input pin |
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