Grant Edwards schrieb:
On 2008-06-26, Chris Liechti <[email protected]> wrote:
burning the fuse required >7V that the adapter must provide.
Further, it looks like the TI USB FET won't work.
i though it should? "msp430-jtag -l TIUSB --secure" might
work.
Once blown, can the chip (and fuse) be erased via JTAG or
firmware?
the BSL isn't influenced by the security fuse.
the fuse can't be "repaired", thus the JTAG is permanently
disabled.
So it really _is_ a "fuse". That's in contrast to Atmel's AVR
where they call EEPROM cells "fuses". Presumably there's some
historical reason for Atmel's use of that term, but it sort of
makes them sound dumb when they talk about "un-blowing" a fuse.
i don't know how it is technically implemented. but the specs for
"burning" require a higher voltage and some current. that seems to be
enough power to melt a metal layer wire. but EEPROMs also require higher
voltages...
it is certainly not in the normal flash area as that controller has a
charge pump.
chris
