MCP23008/MCP23S08 - Microchip
MCP23008/MCP23S08 - Microchip
MCP23008/MCP23S08 - Microchip
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1.6.2 INPUT POLARITY (IPOL) REGISTER<br />
The IPOL register allows the user to configure the<br />
polarity on the corresponding GPIO port bits.<br />
If a bit is set, the corresponding GPIO register bit will<br />
reflect the inverted value on the pin.<br />
<strong>MCP23008</strong>/<strong>MCP23S08</strong><br />
REGISTER 1-2: IPOL – INPUT POLARITY PORT REGISTER (ADDR 0x01)<br />
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0<br />
IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0<br />
bit 7 bit 0<br />
Legend:<br />
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’<br />
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown<br />
bit 7-0 IP7:IP0: These bits control the polarity inversion of the input pins <br />
1 = GPIO register bit will reflect the opposite logic state of the input pin.<br />
0 = GPIO register bit will reflect the same logic state of the input pin.<br />
© 2007 <strong>Microchip</strong> Technology Inc. DS21919E-page 11
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