LECTURE 16 8250 UART : UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER
Serial communications is sufficiently complex that special chips have been designed to do the work of
forming and timing the strings of bits that comprise serial data. Such a chip is called a universal
asynchronous receiver transmitter or UART. Without UARTs, communications programming would
be very complicated. The IBM family of microcomputers use the Intel 8250 UART.
The Intel 8250 is a programmable Universal Asynchronous Receiver/Transmitter packaged in a 40-
pin integrated circuit.
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