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SCI in 8 bit modes send the 9th (recessive) bit

Question asked by igor pepelyaev on Aug 7, 2017
Latest reply on Aug 10, 2017 by igor pepelyaev



I use S12ZVML uC and I have a stange issue with SCI.

SCI is used for LIN communication together with integrated LIN transceiver.

SCI is configured for 8 bit data Format (SCI0CR1_M = 0)

Communication works OK but with oscilloscope, I see that after every transmitted byte I have an additional recessive bit.

It looks like SCI transmitter always sends 11 bits (start bit, 8 data bits, 1 recessive bit, stop bit).

Does SCI transmitte always sends 11 bit? (Although SCI is configured for 8 data bit operation)


Best regards