Introduction

The purpose of this document is to describe step-by-step how to configure the USART peripheral on megaAVR^® 0-series and tinyAVR^® 0- and 1-series. While this is a complex peripheral and can work in various modes, this document will use it in Asynchronous mode and describes the following use cases:

• Send “Hello World” to a Terminal

  Demonstrates how to send a string to the PC and show it in the terminal.

• Send Formatted Strings/Send String Templates Using ‘printf’

  Enhances the first use case with the ability to use the ‘printf’ function to send strings over USART.

• Receive Control Commands

  Many times, the USART is used to implement a command line interface. This way, the microcontroller can receive control commands via the USART.