Microchip Technology AN1043
The I/O port is highly configurable for maximum flexibility. The port can either drive logic levels on the pin, or read logic levels from the pad.| Part No. | AN1043 |
|---|---|
| Datasheet | AN1043 Download |
| Manufacturer |  Microchip Technology |
| Description | Unique Features of the MCP23X08/17 GPIO Expanders |
| Buy | Stock & Price |
FEATURES
of the MCP23X08/17 GPIO Expanders Author: Pat Richards Microchip Technology Inc. I/O PORTDESCRIPTION
Figure 1 is a simplified block diagram of an I/O port pin. The level on the pad can be read at any time, regardless if the pin is configured as an input or an output. The IODIR register controls the direction of the pins (input or output). More specifically, the IODIR registers simply enables/disables the output driver. When the driver is activated (IODIR = 0), the pad is driven to the state in the latch register (OLAT). When deactivated (IODIR = 1), the driver is high impedance. The I/O port has multiple, individual configurations. Each pin can …●
● INTRODUCTION GPIO expanders provide easy I/O expansion using standard serial interfaces. GPIO products are used to increase the I/O on an MCU or provide remote I/O using a serial interface. This application note discusses the feature set and use of the MCP23X08/17 (8-bit and 16-bit) GPIO Expanders. The MCP23X08 are 8-bit GPIO Exp...
