AVR-Chat

Kat

My older board is for DIP M8 whereas the new board has TQFP M168 - I don't 
actually have a TQFP M8, nor the tools (or eyesight) to solder one in. The 
design of new and old board are obviously not exactly the same but they're 
very similar and (schematically) identical so far as the ISP programming 
lines are concerned.

The M168 chips were put in for me by hand, so I'm prepared to believe there 
might be assembly faults but I can't find them - if I've got the necessary 
lines connected, and no excessive load on them, shouldn't I expect ISP to 
work anyway?

I have just taken my JTAG ICE mk-II out of its wrapper and tried the 
debugWire interface (not enabled). It also has a facility to enable 
debugWire via ISP but this won't work either - AVR Studio suggests checking 
that the SPIEN fuse is enabled.

Thanks,
Mark

----- Original Message ----- 
From: "Kathy Quinlan" <kat-yahoo@kaqelectronics.dyndns.org>
To: <AVR-Chat@yahoogroups.com>
Sent: Wednesday, February 16, 2005 3:34 PM
Subject: Re: [AVR-Chat] STK500 ISP failure


>
> Mark Nowell wrote:
>
>>>try setting the onboard oscilator (on the STK500) to a lower value not
>>>32K but somewhere around 1Mhz, as the new Mega168 is probably using its
>>>internal 1Mhz osc.
>>>
>>>Regards,
>>>
>>>Kat.
>>>
>>
>>
>> Ok, tried all combinations of "STK500 Osc" and "ISP Freq" settings and 
>> still
>> no hint of a suggestion that the M168 wants to talk.
>>
>> I've checked that miso, mosi, sck all have impedances to 0/5V in MOhm 
>> range,
>> and reset-to-5V just under 10k (these values are the same on the older M8
>> board that does work with STK). Are there any other conditions that I 
>> ought
>> to check for? Should I try removing the external xtal?
>>
>> Thanks,
>> Mark
>
> OK so If you DESOLDER the M168 and SOLDER in an M8 then THAT PCB WILL work 
> ?
>
> IF so, I think the M168 may be faulty or not programed with ISP enabled.
>
> Do you have a Jtag ICE ? (or any Jtag hardware ?)
>
> HTH
>
> Regards,
>
> Kat.
>
> -- 
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