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Serial Double buffers

I have a question that may be difficult. Does anyone know just how deep the
serial transmit buffering goes. I need to do a line turn-around on the RS485,
in very fast timing, and I don't trust the latency of timers. I can dump dummy
characters into the registers, then turn the line around, if I know just how
deep the pile is (transmit, fifo if any, transmit shift register). Anybody

Frank Brown
Phoenix Consulting
for Emerson Climate Technology