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MSP430F6779PZ and Spy-bi-wire programming

hwcollector
Prodigy 90 points

Other Parts Discussed in Thread: MSP430F6779

Are there any special conditions required for the spy-bi-wire interface to work in a MSP430F6779IPZ? There is power (3.5V, provided by the programmer) at the AVCC and DVCC pins and I can see that the VCORE pin is at 1.5V but the Elprotronic MSP430 programmer ver 3.1 reports that the MCU is not responding. I have checked that the RESET pin and the TEST pins are connected properly.

Does anyone have any ideas or suggestions?

Thanks,

Robert

  • 0
    TI__Genius 10405 points

    Hi Robert,

    Does your schematic follow the recommended interface in the MSP430 Hardware Tools User's Guide (Rev. M)?  http://www.ti.com/litv/pdf/slau278m

     

     

        Best,

            Rick Nardone

  • 0 in reply to Rick Nardone
    Prodigy 90 points

    Hi Rick,

    Thank you for taking time to respond and for going that "extra yard" to attach connection schematics and link to relevant document. I have gone through the document and I can confirm that my PCB is compliant and in particular, I am using a 1nF capacitor in the reset circuit. The difference between the schematics and my environment is that I am using a four-pin header and I am using an MSP430Launch pad as programmer. (This worked well with MSP430F2xx devices with Spy-By-Wire inferfaces.)

    I noticed that the LCDCAP pin(pin 47) was not connected on my PCB and I have now grounded this, without success - I still can't communicate with the 6779. In the event I damaged the MCU during the assembly of the PCB, I have request another couple of samples from TI and I'll post here the results when I receive the samples. Unfortunately, this particular device is not commercially available yet and it was an almost perfect match for my intended application!

    EDIT: I have swapped the MSP430LaunchPad with a MSP-FET430UIF using the connections shown in the document and I am pleased to advise that I now have communications with the MSP430F6779. By the way, the schematics attached in your post is missing a connection between pin-8 of the JTAG connector and pin-7 of the same connector. I soldered a 330 Ohm resistor between pin-7 and pin-8 and a wire from pin-8 to the TEST/SBWTCK pin of the MCU.

    Would you happen to know why the MSP430LaunchPad does not work with the 6779? Firmware upgrade required to handle MSP430F6xx devices?

    Regards,

    Robert

  • 0 in reply to hwcollector
    TI__Genius 10405 points

    Hi Robert,

       Glad to hear that you are moving forward! 

       See Table 1-1 from the MSP430 Hardware User's Guide for the answer to  your last questions:

     

     

       Have a great weekend,

              - Rick

        

  • 0 in reply to Rick Nardone
    Prodigy 90 points

    Hi Rick,

    Thanks once again for your prompt reply and for pasting the table instead of just referencing the source document!

    From my understanding of the Spy-By-Wire there is nothing in the SBIW protocol that requires hardcoding in an implementation to support a MSP430F family; I guess that this probably means that the firmware of the programmer in the MSP430LaunchPad has some hardcoding that prevents its use with the MSP430F6xx devices.

    Thanks once again.

    Regards,

    Robert

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