So let us now have a quick look at how to set up USART in general.
Supports Serial Frames with 5, 6, 7, 8, or 9 Data bits and 1 or 2 Stop Bitsīefore we continue, please note that the AVR USART is fully compatible with the AVR UART in terms of register bit locations, baud rate generation, transmitter/receiver operations and buffer functionality.
Master or Slave Clocked Synchronous Operation.
Full Duplex Operation (Independent Serial Receive and Transmit Registers).
Some of the main features of the AVR USART are: If you refer to the USART section in the datasheet of any AVR microcontroller, you will find several features listed there. the data bits are synchronized with the clock pulses. USART stands for Universal Synchronous Asynchronous Receiver/ Transmitter. the data bits are not synchronized with the clock pulses. From the name itself, it is clear that it is asynchronous i.e. UART stands for Universal Asynchronous Receiver/ Transmitter. The UART and USART have already been discussed here. Some images used in this tutorial are taken directly from (and are a courtesy of) the AVR datasheets for ATMega8 and ATMega16/32 microcontrollers. Until now, we have seen a general introduction to serial communication, followed by a tutorial on the concepts of RS-232 communication. So here we are with the AVR communication protocols series, starting with the most basic ones, UART and USART! We will move on to SPI and TWI (I2C) later. Hey folks! Lets continue with our tutorials on Serial Communication.