AN1043 expanders equivalent, unique features of the mcp23x08/17 gpio expanders.
of the MCP23X08/17 GPIO Expanders
Author: Pat Richards Microchip Technology Inc.
I/O PORT DESCRIPTION
The I/O port is highly configurable for maximum flexibility. Figure.
The I/O port is highly configurable for maximum flexibility. Figure 1 is a simplified block diagram of an I/O port pin. The port can either drive logic levels on the pin, or read logic levels from the pad. The level on the pad can be read at any time.
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