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connectivity of RSTDVCC/SBWTDIO for MSP430F523x

Jason Kang
Intellectual 470 points
Other Parts Discussed in Thread: MSP430F5237

Hi. 

There are two reset pins on MSP430F5237: RSTDVCC/SBWTDIO & RST/NMI. 

Page 3/8 of "SLAA558-Nov 2012" describes a case when  RST/NMI is not used. 

By the way, I am planning to use only RSTDVCC/SBWTDIO. 

In that case, can I leave RST/NMI not connected?

Thank you. 

  • 0
    TI__Guru 68116 points

    Hi Jason,

    I think the answer is further down on the same page of that document: www.ti.com/lit/pdf/slaa558


    "If the RST/NMI pin is unused, select and enable the internal pullup resistor, or connect an external pullup resistor (47 kΩ recommended) to the pin."

    I would probably go with the external pullup myself, just so that you know the pin is properly pulled up even before any code starts to run (since configuring the pullup couldn't happen until your code has actually started). I think the purpose of pulling the pin up is so that the pin doesn't pick up noise and cause unexpected resets.

    Regards,

    Katie

  • 0 in reply to Katie Pier
    Intellectual 470 points

    Not sure how come I missed this line!

    Thank you for your help.

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