why is UART used in circuits and particularly with ATMEGA32? Is it necessary to have a uart for connecting a usb to the circuit?

 

http://users.ece.utexas.edu/~valvano/Volume1/E-Book/C11_SerialInterface.htm

 

UART is still being used on micros because:

1) it is easy to implement in hardware
2) historical and legacy reasons, backward compatibility.

USB needs much more than hardware to implement. It requires a lot of software overhead to implement the USB protocol. You will not find USB in low end MCUs.

UART and USB are two completely different things.

There is such a thing as a UART-to-USB bridge, such as Silicon Labs CP2102 which can be used to connect an MCU with UART to a host computer USB.
However, the PC sees the MCU as a UART COM port, not a USB device.

 

UART is still being used on micros because:

1) it is easy to implement in hardware
2) historical and legacy reasons, backward compatibility.

USB needs much more than hardware to implement. It requires a lot of software overhead to implement the USB protocol. You will not find USB in low end MCUs.

UART and USB are two completely different things.

There is such a thing as a UART-to-USB bridge, such as Silicon Labs CP2102 which can be used to connect an MCU with UART to a host computer USB.
However, the PC sees the MCU as a UART COM port, not a USB device.

 

In case you want to know, the best chipset for UART to USB conversion is manufactured by FTDI, its drivers are far better and more reliable than prolific, for instance.

 

UART is still being used on micros because:

1) it is easy to implement in hardware
2) historical and legacy reasons, backward compatibility.

USB needs much more than hardware to implement. It requires a lot of software overhead to implement the USB protocol. You will not find USB in low end MCUs.

UART and USB are two completely different things.

There is such a thing as a UART-to-USB bridge, such as Silicon Labs CP2102 which can be used to connect an MCU with UART to a host computer USB.
However, the PC sees the MCU as a UART COM port, not a USB device.

thanks, it helped me alot