Hello, I'm seeing a lot of people talking about USART. But I was wondering what is the difference Between USART and UART? I'm a little confused. I have a few attiny3217 and they have USART on them.
Joseph
What did GOOGLE tell you?
A whole lot of headache that I do not understand.
Joseph
Your google is broken.
A USART can do everything a UART does, plus a
USART is more complex and can generate data in a form corresponding to many different standard protocols
HTH
a7
Hi
The main difference is the transmission mode:
USART (Universal Synchronous/Asynchronous Receiver/Transmitter)
UART (Universal Asynchronous Receiver/Transmitter)
The USART allows you to use the transmission in synchronous and asynchronous mode, and the UART only in asynchronous mode.
Asynchronous means without a common clock signal for the two ends. An asynchronous signal arrives at the receiver at any time, not related to any particular clock signal. The receiver uses the leading edge of the first received bit to start a local clock which it uses for sampling the incoming data bits. The clock at the sender and receiver are not synchronised, so can drift apart if their frequencies are slightly different (which they must be). Thus asynchronous transmission isn't so good for long sequences of high speed data.
Synchronous means the sender and receiver share a common clock signal (which might be transmitted from one to the other on a separate wire, or might arrive at both from a master clock source). Synchronous transmission allows for longer sequences of very high speed data, because the sender and receiver clocks cannot drift with respect to one another.
You are right my google is broken. It broke it not me. Then it broke me too 
Joseph
Thank you very much for helping me to udnerstand that.
Joseph
Thank you also. Trying to understand it.
Joseph