UART - définition. Qu'est-ce que UART
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Qu'est-ce (qui) est UART - définition

COMPUTER HARDWARE DEVICE
UART; Serial uart; UART overrun; Uart; Universal asynchronous receiver transmitter; Serial Communication Interface; 16450; Serial Communication Controller; Universal asynchronous receiver/transmitter; 16C450; 16450 UART; 16450 (UART); NS16450; PC16450C; Serial communication interface; Motorola 6850
  • Example of a UART frame. In this diagram, one [[byte]] is sent, consisting of a start bit, followed by eight data bits (D0-7), and two stop bit, for a 11-bit UART frame. The number of data and formatting bits, the presence or absence of a parity bit, the form of parity (even or odd) and the transmission speed must be pre-agreed by the communicating parties. The "stop bit" is actually a "stop period"; the stop period of the transmitter may be arbitrarily long. It cannot be shorter than a specified amount, usually 1 to 2 bit times. The receiver requires a shorter stop period than the transmitter. At the end of each data frame, the receiver stops briefly to wait for the next start bit. It is this difference which keeps the transmitter and receiver synchronized.
BCLK = Base Clock
  • Block diagram for a UART

UART         
Universal Asynchronous Receive and Transmit
16450         
<hardware> A UART with a one-byte FIFO buffer. The 16450 is a higher speed, fixed version of the 8250. It was superseded by the 16550. The 16450 was used for the IBM PC AT and PS/2 but will not work in a IBM PC XT. (2004-03-21)

Wikipédia

Universal asynchronous receiver-transmitter

A universal asynchronous receiver-transmitter (UART ) is a computer hardware device for asynchronous serial communication in which the data format and transmission speeds are configurable. It sends data bits one by one, from the least significant to the most significant, framed by start and stop bits so that precise timing is handled by the communication channel. The electric signaling levels are handled by a driver circuit external to the UART. Two common signal levels are RS-232, and RS-485. Early teletypewriters used current loops.

It was one of the earliest computer communication devices, used to attach teletypewriters for an operator console. It was also an early hardware system for the Internet.

A UART is usually an individual (or part of an) integrated circuit (IC) used for serial communications over a computer or peripheral device serial port. One or more UART peripherals are commonly integrated in microcontroller chips. Specialised UARTs are used for automobiles, smart cards and SIMs.

A related device, the universal synchronous and asynchronous receiver-transmitter (USART) also supports synchronous operation.