Re: Programming all fuse and lock bits, as well as Flash and EEPROM

Erik Christiansen <[email protected]> wrote:

>    What do avrdude users do when it's time to play with the
>    increasing complement of "fuse" bits in recent AVR offerings?

The new chips are not the problem here.  All their fuses can be
reached using the ISP method, and avrdude supports all these fuses (of
course).  For >= ATmega16, you can alternatively program everything
using the JTAG interface.

There's the SPIEN fuse which can never be cleared when using serial
dowloading (for good reason).

And there are a few now already obsolete or almost obsolete AVRs where
you cannot reach some fuses in serial programming but requires
high-voltage parallel programming (which also requires more hardware
on the programmer's end).  The RC oscillator enable fuse of the
AT90S1200 comes to mind here.  Perhaps that's even the only one at
all, i'm not sure.
-- 
J"org Wunsch					       Unix support engineer
[email protected]        http://www.interface-systems.de/~j/