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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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MCP23009ESS Fiches technique(PDF) 14 Page - Microchip Technology |
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MCP23009ESS Fiches technique(HTML) 14 Page - Microchip Technology |
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14 / 50 page  MCP23009/MCP23S09 DS22121B-page 14 © 2009 Microchip Technology Inc. 1.5 GPIO Port The GPIO module is a general purpose 8-bit wide bidirectional port. The outputs are open-drain. The GPIO module contains the data ports (GPIOn), internal pull up resistors and the Output Latches (OLATn). The pull up resistors are individually configured and can be enabled when the pin is configured as an input or output. Reading the GPIOn register reads the value on the port. Reading the OLATn register only reads the latches, not the actual value on the port. Writing to the GPIOn register actually causes a write to the latches (OLATn). Writing to the OLATn register forces the associated output drivers to drive to the level in OLATn. Pins configured as inputs turn off the associated output driver and put it in high-impedance. |
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