UART - Universal Asynchronous Receiver Transmitter with Protocol Support

The Universal Asynchronous Receiver Transmitter (UART) module is a serial I/O communications peripheral. It contains all the clock generators, shift registers and data buffers necessary to perform an input or output serial data transfer, independent of device program execution. The UART, also known as a Serial Communications Interface (SCI), can be configured as a full-duplex asynchronous system or one of several automated protocols. The Full Duplex mode is useful for communications with peripheral systems, such as wireless modems and USB to serial interface modules.

Supported protocols include:

The UART module includes the following capabilities:

The operation of the UART module is controlled through 19 8-bit registers:

The UART transmit output (TX_out) is available to the TX pin and internally to various peripherals.

Block diagrams of the UART transmitter and receiver are shown in the following figures.

Figure 1. UART Transmitter Block Diagram
Figure 2. UART Receiver Block Diagram