AN1043

AN1043 Unique Features 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 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 ...