MSPM0G3507: UART 9 bit address mode

Dear expert, 

Do we have any resources to implement below feature? 

1. Master send and receive
2. Slave send and receive

Best Regards,

Eric Chen

Hi Eric,
The M0 devices don't support UART 9-bit address mode, and we don't have examples. For your question below, what do you mean by Master and slave send and receive? Are you still referring to UART or another communication protocol?
Best Regards,
Diego Abad

Dear Digeo, 

Diego Abad Sajamin said:

The M0 devices don't support UART 9-bit address mode, and we don't have examples.

But why do we support the 9 bit UART address mode on our device? 

Diego Abad Sajamin said:

Master and slave send and receive? Are you still referring to UART or another communication protocol?

Yes, acting as transciever/reciever. 

The main goal is to achieve MDB. 

Multidrop bus - Wikipedia

Best Regards,

Eric Chen

Dear Diego, 

Do we have plan to implement this? 

Best Regards,

Eric Chen

Diego, 

Do you mean current M0 UART IP can support 9 bit data mode and it is feasible to modify bit 9 for Mode bit (Master/Slave) instead of Parity bit? 

It is possible to implement MultiDrop protocol if our UART IP is allowed to do this by changing current software. 

Could you confirm the feasibility on this the 9th data bit is able to be modify by software? 

BR, Rich

Hi Rich,

In 9-Bit UART Mode the parity enable/mode bits are ignored and a peripheral checks for the address qualifier at the location of the parity bit. For more information on it, please consult the MSPM0G3507 TRM Chapter 16.2.3.10 9-Bit UART Mode.

For MultiDrop protocol, yes it could be done, but there will be some overhead and probably some layer(s) (like SMBUS) that make the expected protocol play nice with our peripherals.

Yes, you can modify the 9th bit by software. Here's a table from the TRM that describes the 9th Bit Handling. 

Best Regards,

Diego Abad

Diego, 

Thanks for the confirmation. 

The answer is feasible on our UART IP. 

That's what we would like to confirm. 

BR, Rich