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MSP430FR2355: Purpose of ISOTXD and ISORXD pins

Sean Reynolds
Prodigy 20 points

Part Number: MSP430FR2355

The datasheet says the MSP430FR2355/2353/2155/2153 family have an "ISO" function, with the pins ISOTXD and ISORXD, but it doesn't give much more than that.  There doesn't seem to be a description in the User's Guide or Datasheet of what these actually do.

The only thing it says (page 22 of DS) is ISOTXD is (UCA1TXD & TB3.2B), and ISORXD goes to UCA1RXD and TB3.CCI2B.

My questions is, what are these pins intended for?  How does this linking to TB3 help?  Some kind of isolated serial or ISO serial standard?

Any idea what these are used for, and if there's an example somewhere?  Thanks!

  • 0
    TI__Mastermind 30545 points

    Hey Sean,

    I actually do not know what this funcationality is supposed to be.  Thanks for pointing this out! 

    Let me reach out to our systems team, and get back to you mid-next week. 

    Thanks

    JD

  • 0 in reply to JD Crutchfield
    TI__Mastermind 30545 points

    Hey Sean,

    Still chasing this down.  At first look, it appears to be somewhat related to the Manchester encoding module (MFM) on the device.  The MFM connects the timers to the SPI to enable manchester encoding schemes. This ISO seems to be somewhat similar but with UART.   

    Unfortunately, there are no code examples or documentation to share at this time.  I'm working with our teams to determine what we'll do with this going forward.  This will probably take a decent amount of time.  

    Did you have a specific use case you were interested in?  

    Thanks for bringing this to my attention.  

    JD

  • 0 in reply to JD Crutchfield
    Prodigy 20 points

    Interesting, that makes sense, thanks!

    No specific use case, just laying out this chip for a project and was wondering if those pins were something that I should be aware of/could be useful for something.  It doesn't involve encoding though, so it sounds like I'm good to go.

    I'll be interested to see if some docs surface sometime, maybe for a future project.

    Thanks again for looking into this!

    -Sean

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