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MSP430 Ultra-Low Power 16-bit Microcontroller Forum
"security fuse has been blown" error
We are using MSP430F5438 microcontroller with CCS V5.1 compiler. Previously, debugging ( using JTAG = MSP-FET430UIF ) was working fine. Now, when I was trying to communicate with microcontroller through JTAG, I got the error "Security fuse has been blown". After that microcontroller seems to be locked and I was unable to communicate through JTAG. How can I unlock the Microcontroller and resume the debugging with JTAG?
Thanks in Advance.
Most likely, the "security fuse" (which is actually the contains of certain locations in the protected BSL-Flash) is not "blown". The Tool Chains have lots of problems and the error message may be totally wrong.
In the rare case when the "security fuse" is accidentally "blown" (and the error message was actually correct), the rest of BSL is probably accidentally altered too. Thus BSL will not work either and that chip is locked for good.
old_cow_yellowIn the rare case when the "security fuse" is accidentally "blown" (and the error message was actually correct), the rest of BSL is probably accidentally altered too. Thus BSL will not work either and that chip is locked for good.
Using 4-wire JTAG instead of SBW protocol, a parallel port FET instead of an USB one, or a dedicated flashing software such as Elprotronic's free "lite FET-Pro430" software may make the MSp accessible. Or attach to the BSL and mass-erase the MSP. And don't flash the same software again - first figure out what's happening and fix it. :)
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My problem is solved by mass erase using BSL .
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