ll run at 16 times the baud rate (bits per

second) to allow the receiver to do centre sampling - i.e. to read each bit in the middle of its allotted time period. This makes the UART more tolerant to variations in the clock rate ("jitter") of the incoming data.

An example of a late 1980s UART was the Intel 8450. In the 1990s, newer UARTs were developed with on-chip buffers. This allowed higher transmission speed without data loss and without requiring such frequent attention from the computer. For example, the Intel 16550 has a 16 byte FIFO. Variants include the 16C550, 16C650, 16C750, and 16C850.

The term "Serial Communications Interface" (SCI) was first used at Motorola around 1975 to refer to their start-stop asyncronous serial interface device, which others were calling a UART.

See also bit bang.

[Is this the same as an ACIA?]

Last updated: 2003-07-13

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