Data transfer via communication ports
NOTE
For details on the operation of the "reception done" flag, the "transmission done" flag, and the
communication error flag, see page 757.
For details on the format of the data in the send buffer and in the receive buffer, please see "Format of
send and receive data" on page 745.
Data cannot be sent unless the pin CS (Clear to Send) is on. When connecting to a three-wire port,
short-circuit the RS and CS pins.
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