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I had a problem last week with ISP programming, or so I thought. It turned out that I had a ground problem that wiped out some Mega16s. The signature was reported as being incorrect for the blown chips, generally all 0s. Some of those that I could not program with the ISP turned out to be okay when I plugged them into the STK500 then erased/programmed them in parallel mode. You might try that.

Those that would not program with the ISP, but would after parallel erase then program, had a strange signature but not 0s.

REB

John Samperi wrote:

At 02:05 PM 3/06/2005, you wrote:

All the others report the incorrect chip signature (it changes). The chip 
that I can program reports the correct signature.

I am really lost, not sure what to try!

I don't have a STK500 so I can't be sure of the following.
However I have an AVRISP which I believe is similar and
you may want to check your programmer's clock speed. Keep it
at about 230KHz as it can only be a maximum of 1/4 the
chip's clock frequency. As the chip usual come with the
internal 1MHz clock enabled, the programmer will play up
if it is set too high, say 500KHZ or 930KHz.

Regards

John Samperi

AVR-Chat

Re: [AVR-Chat] STK500 problem?

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