Re: [Mspgcc-users] error: msp430:Could not access device - security fuse is blown (3 0)

[Chris L. <cli...@gm...>]

Collins Martin (ext) wrote:
> Hi,
> 
> i get the error message:
> 
> error: msp430:Could not access device - security fuse is blown (30)
> 
> from gdb-proxy intermittently. I downloaded and installed msp-gcc
> just last week so I've got the latest versions. I'm using the
> MSP430-449STK2 <http://www.olimex.com/dev/msp-449stk2.html>  kit from
> Olimex. I'm not providing an external power supply to avoid the
> problems associated with the JTAG interface having different levels
> to the rest of the board.

are you sure your JTAG adapters supply is strong enough? the parallel 
port adapter can only deliver a few milliamps and some PCs (especialy 
laptops) have not the standard 5V output but a lower voltage, which 
makes the situation worse.

i usualy have no problems with the onboard supply + JTAG supply, but 
then i only use boards with onboard 3V and a 3V JTAG adapter and the 
JTAGs supply has a series schottky diode.

it seems to be important that the logic levels of the JTAG adapters 
signals match the VCC of the MSP430, so having a separate supply can 
cause trouble...

chris


> As I said I see the problem every now and then. I just wondered if
> someone knows what it's about?
> 
> Thanks for any info, Martin.
> 
> 
> 
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