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Omission of SCI Transmission Data Byte After Starting Communication

Last Updated:07/04/2018

Question:

After starting SCI communication, the 1st  byte or 2nd byte of transmission data is omitted (no output from the TXD terminal). What could be the reasons and how to fix it?

Answer:

When the interrupt status flag (IRn.IR bit) of the interrupt controller is "1" at the timing of communication start, clear the IR bit before enabling operation (set the SCR.TE bit to "1").  See the manual for the clearing procedure in detail.
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