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Informational flash still readable after fuse blown?

Zhiyong Li
Prodigy 180 points

Hi folks,

One feature of Fet-pro430 is to write serial number of a product into information flash. I am curious whether this serial number can be somehow  read out after I blow the fuse or write the fuse key in F5/6 series MSP430. I would assume yes, because if this number cannot be read then it defies the purpose of a serial number.

Sorry I could not find this type of information in the manual and I don't want waste a chip to experiment with it.

Please advice, and thanks in advance.

ZL

  • 0
    Guru 25210 points

    This isn't necessarily a feature of the FET itself, as it is of the software on the PC using the FET. Once you blow the security fuse, you lose access to the JTAG port, and thus the ability to read out your serial number via that method.

    Zhiyong Li said:
    I would assume yes, because if this number cannot be read then it defies the purpose of a serial number.

    The answer is no. And it doesn't defy the purpose of the serial number, since you can always implement a function in your software to read the serial number and spit it out (via UART or query by USB if your part has that).

    You have a tradeoff to make between need to read serial number with FET and using the security fuse. It's an XOR decision.

  • 0 in reply to Brian Boorman
    Prodigy 180 points

    Hi Brian,

    Thanks for the answer. I will probably add a function into the code to display serial number upon activation of a button.

    ZL

  • 0 in reply to Zhiyong Li
    Guru 12050 points

    BSL is still available after you blow the fuse.
    9600 baud to it's RX/TX & reset pin is need to kick start it on,
    you can send commands to read selected memory parts + length

  • 0 in reply to Tony Philipsson
    Guru 227245 points

    Tony Philipsson said:
    BSL is still available after you blow the fuse.[...]you can send commands to read selected memory parts + length

    ... if you know the correct password. If you don't, you can't do anything but a mass erase. And on 5x family BSL, a wrong password will do the mass erase for you. :)

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