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Embedded Systems Architecture by Daniele Lacamera

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Protocol description

As previously mentioned, asynchronous serial communications rely on implicit synchronization of the bit rate between the transmitter and the receiver in order to guarantee that the data is correctly processed on the receiving end of the communication. If the peripheral clock is fast enough to keep the device running at a high frequency, asynchronous serial communication may be pushed up to several megabits per second.

The symbol synchronization strategy is based on the identification of the beginning of the transmission of every single byte on the wire. When no device is transmitting, the bus is in an idle state. To initiate the transmission, the transceiver pulls the TX line down to the low logic level, for a time that ...

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