What is the difference between uart and usart?

Answer 1

UART is universal asynchronous receiver/transmitter. It is a piece of computer hardware that translates data between parallel and serial forms. Modern ICs that have UART's that can also communicate synchronously are called USARTs (universal synchronous/asynchronous receiver/transmitter).

Answer 2

1.UART-UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER USART-UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER. 2.In USART we can send a clock along with data In UART ,it requires only data. 3.USART is faster than 115kb. 4.In UART,byte by byte transmission In USART, block of data transmission

Answer 3

A UART or Universal Asynchronous Receiver-Transmitter is a piece of computer hardware that translates between parallel bits of data and serial bits. A UART is usually an integrated circuit used for serial communications over a computer or peripheral device serial port. UARTs are now built into some microcontrollers (for example, PIC16F628). USART refers to UART with synchronous implementation.

The word "asynchronous" indicates that UARTs recover character timing information from the data stream, using designated "start" and "stop" bits to indicate the framing of each character. In synchronous transmission, the clock data is recovered separately from the data stream and no start/stop bits are used. This improves the efficiency of transmission on suitable channels; more of the bits sent are data. An asynchronous transmission sends nothing over the interconnection when the transmitting device has nothing to send; but a synchronous interface must send "pad" characters to maintain synchronism between the receiver and transmitter. The usual filler is the ASCII "SYN" character. This may be done automatically by the transmitting device.

Some chips have both synchronous and asynchronous modes. These are called USARTs (for "universal synchronous asynchronous receiver-transmitters")