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Line 5: == Operation == The operation of a USART is intimately related to the various protocols; refer to those pages for details. This section ~~covers~~ only ~~some~~provides a few general ~~characteristics~~notes. * USARTs in synchronous mode transmits data in [[Frame (networking) \|frames]]. 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. * USARTs operating as synchronous devices used either character-oriented or bit-oriented mode. In character (STR and BSC) modes, the device relied on particular characters to define frame boundaries; in bit (HDLC and SDLC) modes earlier devices either relied on physical-layer signals, while later devices took over the physical-layer recognition of bit patterns.

Universal synchronous and asynchronous receiver-transmitter: Difference between revisions