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Computer Technology > UART (Universal Asynchronous Receiver Transmitter) Chip

The following information is about UART (Universal Asynchronous Receiver Transmitter) Chip.

UART (Universal Asynchronous Receiver Transmitter) Chip Defined

Helps to convert parallel data from the computer into a serial data stream for transmission over a phone line (i.e. modem) and accepts serial data from the modem and converts it back into parallel data for the CPU. UART's also have a character buffer to store extra characters that the CPU doesn't have time to process immediately. The buffer sizes on earlier UART's were only able to store one character. Data characters which were stored in them would often get over-written by in-coming characters if the CPU was too busy to process them in time. The 16550 UART has a 16 character FIFO buffer and performs flow control. This decreases the number of character over-runs. It is recommended to enable the FIFO Buffer setting if the modem has a 16550 UART. See also "FIFO Buffers".

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