[Bill Porter] has a tip for designing circuits that have multiple connections to a single microcontroller UART. This stemmed from a review of a friend’s circuit design that used the UART in t… ...

A close look at the block diagrams shows an I/M pin that lets engineers choose either Intel (80xxx) or Motorola (68000) modes. You can still buy processors in those families, although I doubt many new ...

The default UART ports have rather a fixed rate or are connected to Bluetooth. Only one or two of the alternative UART does not intefier with any other default pins like i2c.