This connection is
asynchronous, which means that a special line for clock signal transmission is not used. In some situations
this feature is crucial (for example, radio connection or infrared waves remote
control). Since only one
communication line is used, both receiver and transmitter operate at the same
predefined rate in order to maintain necessary synchronization. This is a very
simple way of transferring data since it basically represents conversion of
8-bit data from parallel to serial format. Baud rate is not high up to 1 Mbit/sec.
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