TI external UARTs that support 9bit addressing mode / rs485 multidrop

James Salisbury

Hi,

I am looking for an external uart that supports 9bit addressing. Such a uart will use the partity bit to indicate the byte is address or data, and will cause a recive interupt if the parity bit is set.

Thanks

over 14 years ago

0 Joe Fockler over 14 years ago

TI__Expert 5230 points

Hi James,

You can use LCR[5] - the Force Parity or Stick Parity bit in the LCR register - as the 9th bit.

There is an example in an archived Electronic Design article: http://electronicdesign.com/print/embedded/use-the-pc-s-uart-with-9-bit-protocols6245.aspx

Best Regards,

Joe

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TI external UARTs that support 9bit addressing mode / rs485 multidrop