1655098

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A 16550 compatible Universal Asynchronous Receiver Transmitter (UART) is an IC designed for asynchronous serial communication and is widely used in computer devices and other electronic protocols such as RS-232, RS-485, and other current serial interfaces. It is also known as the Enhanced Serial Peripheral Interface (ESPI) chip.

The 16550 UART, developed by National Semiconductor and used in many devices today, is an improved version of the original 8250 UART. It features an internal 16 byte data FIFO buffer for efficient data transfer, improved clock rates of up to 16 megahertz, and higher data transmission speed of up to 8 MB/s. The 16550 UART is designed for bi-directional communication over a single signal cable and is considered a D-Sub connector due to its use in D-Sub type connections.

The 16550 UART features an eight-bit data path and two handshake lines for controlling the data flow between two devices. It is designed to transmit and receive data packets at high speeds with minimal overhead and latency. The UART also features several status bits and registers to store data, enable interrupts, and provide other important status information.

The 16550 UART is a widely used device in a variety of devices, including modems, expansion cards, computer motherboards, hand-held devices, and consumer electronics. It is also used in automotive applications, such as for in-dash navigation systems and car stereo systems. In addition to its use in D-Sub type connections, the 16550 UART is also used in industrial applications, such as factory automation, serial data logging, instrumentation and control, and industrial networking.

The 16550 UART’s main operating principles are synchronous and asynchronous communication. In synchronous mode, the UART will transmit and receive data words in the form of a continuous stream of bits, while in asynchronous mode, it will transmit and receive data words in the form of individual data frames. In both modes, the data word is defined as 8 bits and the data bits and their order are determined by the UART’s internal clock signal.

In synchronous mode, the data frames include start and stop bits, parity bits, and other optional bits. The UART can send or receive data packets with different speeds and bit lengths, up to 8 MHz and 8 bits, while in asynchronous mode, the data frames only require the minimum to send or receive the data, and are composed of the start bits, data bits, parity bit, and stop bits.

The 16550 UART provides efficient data transfer and low overhead and latency, making the device suitable for a wide range of applications. Its wide compatibility, high speed and data transfer capability, and the fact that it is available in a variety of form factors make it extremely popular in the computer and industrial electronics markets. These attributes also make it a popular choice for D-Sub connectors.

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