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RE: [avr-gcc-list] Lock bits


From: Larry Barello
Subject: RE: [avr-gcc-list] Lock bits
Date: Tue, 4 Jan 2005 06:15:44 -0800

If you managed to disable the JTAG and SPI interface, then your only
solution is a parallel high voltage programmer (e.g. STK500).

More likely, however, is that you accidentally selected an external clock
option which effectively kills the chip. You can recover by feeding a
1-16mhz clock into XTAL1 (or 2, look at the data sheet) and then reprogram
the fuse bits..  This is easy to do with the STK500.  Others have made a
simple relaxation oscillator with a few gates or 555 chip and fed the signal
into the chip that way.

-----Original Message-----
From: address@hidden
[mailto:address@hidden Behalf Of interia
Sent: Friday, November 05, 2004 12:45 AM
To: address@hidden
Subject: [avr-gcc-list] Lock bits




Hello
     I have programmed all lock bits in ATMEGA128 by accident. Now I
     can't write anything to my chip. I found that erasure procedure can
restore lock bis to
     unprogrammed state but how to do it? I'm using PONYPROG and SPI
     serial programmind and can also use JTAG. I've tried all
     variations but none of them successfully worked.
     Is there any way to solve my problem?



--
Best regards,
Daniel Kica                         mailto:address@hidden



----------------------------------------------------------------------
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