Universal synchronous and asynchronous receiver-transmitter: Difference between revisions
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USARTs in synchronous mode transmit in [[Frame (networking) |frames]], which are delimited by flag characters. The flag character is only transmitted as a frame delimiter; any flag characters in data are carefully transformed on transmission by the addition of bits (bit stuffing), a process which is reversed on reception. Control and data characters are then sent continuously without start and stop bits. At the end of frames, a [[frame check sequence]] is inserted, so that errors in transmission can be reliably detected. In synchronous operation, characters must be provided on time until a frame is complete; if the controlling processor does not do so, this is an ''"underrun error''," and transmission of the frame is aborted.
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