msp430 security fuse blow

[jpxu 0]

Hi i m new here

I work on a project that check the fram and sram of the microcontroler msp430 5969. I use mspdebug to modify the value on this ram. And then i get error message "security fuse blow",how can i fixe it? I can't program neither with ccs nor with energia.

Thanks

[roadrunner84 466]

When the fuse is blown, you can't access the memory anymore, it's a security feature.

Usually the fuse can only be blown using a FET programmer.

The only way to get communication working again is by taking another msp chip.

[spirilis 1,265]

IIRC there is some way to recover the Wolverine FRAM chips via a Bootstrap loader sequence or something.  I have no idea how to pull it off though.  Someone encountered this problem early on with the FR5969 LaunchPad when tinkering with the FRAM.

[greeeg 460]

@@roadrunner84 Only devices requiring High-voltage fuse blow feature a real 'fuse' I know that the FRAM line is just a software 'fuse' which disabled JTAG access, using the BSL with an unknown password allows you to erase the device, and in the process unlock the device.

 

I believe the really early devices (FR5739) had this problem with mspdebug, since this 'fuse' was located in the interrupt vectors... I had to use a launchpad to enter the BSL and erase the device a few times.

I didn't think this was a problem with newer devices.

[jazz 209]

Hi i m new here

I work on a project that check the fram and sram of the microcontroler msp430 5969. I use mspdebug to modify the value on this ram. And then i get error message "security fuse blow",how can i fixe it? I can't program neither with ccs nor with energia.

Thanks

 

Here is example for (un)blowing soft fuse...http://forum.43oh.com/topic/2972-sbw-msp430f550x-based-programmer/?p=43889

 

With bad (modified) BSL and blown soft fuse it is not able to unlock 5xx/6xx flash device. Soft fuse on new FRAM devices can be unblown by boot code erase command. "Security fuse blow" can be reported by FET (dll) also when device is flashed by bad/wrong code, even fuse value is OK (unblown).