Any known issues programming mega16s with jtag?

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#1
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I've been using the jtag and studio 4.08 to program mega128s and everything works ok, but 2 of the 3 mega16s I've programmed using the same setup have stuck fuses and wont verify or program. Other than setting mega16 in the jtag window, is there some other open issue someone knows about? Bad batch of mega16s, or ??

Imagecraft compiler user

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I'm not a JTAG person, but could it be related to recent discussions on programming speed & the default 1MHz oscillator? Do you have a way to "slow down" the JTAG and see if that works?

Lee

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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That's a thought..... except that the mega128s come from the factory as 1mhz mega103s, so the very first thing you do is go to the fuse menu in studio, and they always work like a champ. Just these 16s were giving me trouble (but I guess there's the possiblility I overvoltaged em or something stupid...)

Imagecraft compiler user

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Just anecdotal, but we seem to run into the situation on a fair percentage of Mega16s, but rarely have trouble with other flavours of AVR (Mega8, '169, '162, etc.). Perhaps the cal. byte needs to be loaded to get it closer to 1MHz, & it is really running at, say, 500kHz.

Lee

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.