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Patrik78's avatar
Patrik78
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3 years ago

UART 16550 - 9 bit mode

Hello, I started working with this IP, and reading embedded user guide I can see it is 5-9 bit character length configurable. In fact LCR register bit number 8 (dls9) can be used to configure a 9...
ctavoni's avatar
ctavoni
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3 years ago

Hello,

I have the same problem trying to use the 16550 IP to emulate the 9th bit "wake up mode" (68hcxx) or the "multiprocessor communication Mode 2" (i8051)

I can understand that Stick Parity is activated to "0" if LCR [5]=1 and LCR [3,4]=11, and is activated to "1" if LCR [5]=1 and LCR [3,4]=10 so is clear what happen in the Tx process.

In the Rx process is not clear:

  1. where I can read the Rx Stick Parity Bit?
  2. can be associated a "Parity Interrupt" to a specific value of the Stick parity bit and how?

Best Regards