Introduction
Precision32™ devices use one or more Port I/O Crossbar Decoders to assign internal digital signals to Port I/O pins. A crossbar decoder provides the system designer with flexibility to customize the pinout according to the needs of the application. The Port I/O Crossbar Decoder is particularly useful in low pin count devices where the number of internal digital signals outnumber the available I/O pins.

The crossbars are fully supported by the Silicon Labs Precision32 SDK, including Hardware Access Layer (HAL) routines and code examples showing how to configure a crossbar for a particular peripheral. Additionally, the Precision32 AppBuilder application provides a graphical interface to easily configure pins in a crossbar