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MSP430F5438A: JTAG fuse, TEST/SWBTCK and RST/NMI/SWBTDIO behaviour

Robert Finger
Genius 16212 points
Part Number: MSP430F5438A

Hi Team,

When the JTAG fuse is burned to prevent JTAG access, does TEST/SWBTCK still have an influence on RST/NMI/SWBTDIO? Question is related to Figure 2-13 in slau320. Does the same picture apply in case the JTAG fuse is burned?

Thanks,
  Robert

  • +1
    Guru 33653 points

    JTAG fuse is not related to RESET / TEST pins or SBW / JTAG / BSL entry sequence. With blown JTAG fuse device can enter to SBW / JTAG mode and exchange data with master by mailbox system using SBW / JTAG interface.

    BTW, JTAG fuse in F5xx family is not hardware fuse like in F2xx/G2xx devices. It is just memory value (double word) written in last BSL flash segment that is rewritable (reversible).

  • +1 in reply to zrno soli
    TI__Mastermind 32920 points

    Yes, you can. That is why you will get "the device is locked" from CCS. If the entry sequence is broken, you will get "Unknown device".

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