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USART and stop bits

Question asked by slandrum on Jun 23, 2011
Latest reply on Mar 31, 2013 by collin.francois_davi
In playing around with USART3, I'm attempting to configure it for DMX (250000 baud, 8 data bits, 2 stop bits).  In fact, when configured this way, what actually seems to happen is that any data I attempt to send is actually sent as 7 bits (the MSB is dropped).  The stop bits are there, but the last data bit was stolen.

I can get what I want by configuring for 9 data bits and two stop bits, what comes out is actually 8 data bits and two stop bits.

This behavior doesn't match what I would expect from the reference manual, but since I can do what I need to do I'll proceed.

I haven't tested to see if this behavior is the same on the other USARTs/UARTs, but I would expect that it would be identical.