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From: eden on 25 Jul 2005 09:54
I don't think there is such jumper, but I am not sure.
Anyway, I found the link to the exact model I bought. This is the full
picture of the board:
http://www.mikroelektronika.co.yu/domestic/product/tools/avreasy/pdf/AVReasyrel.pdf
and this is the user's manual:
http://www.mikroelektronika.co.yu/domestic/product/tools/avreasy/pdf/avreasyupustvo.pdf
but in Serbian language. I couldn't find English version. But, from the
pics should be clear enough what is possible to do with the board.

Goran

From: eden on 25 Jul 2005 12:14
I also uploaded the circuit here:
http://saturn.walagata.com/w/gburchevski/AVReasysch_do.PDF

Goran

From: eden on 25 Jul 2005 12:23
and the program on Windows was:ATMEL AVR ISP Version 2.65
and Linux: uisp-20030618

From: Ico Doornekamp on 25 Jul 2005 13:48
> Now, my problem was, I couldn't write anything into the chip (90S8515).
> This studio could connect to the board, read the EEPROM and program,
> but if I tried to erase or write something back, it was always failing,
> without any specific error.

Hi Goran,

You might want to check the settings of the fuse bits of your processor. AVR
microcontrollers have a few special memory locations which can be programmed
separately from flash and eeprom, called 'fuses'. One of those fuse bits is
used to write-protect the internal flash/eeprom.

The fuse bits can usually be configured in your programming software, look
for 'Memory lock bits' settings somewhere. Be careful with the fuses though,
since its easy to disable serial programming mode or stop the internal
clock, thus 'breaking' the device (not really broken, but you can't recover
with only a serial programmer)

_Ico

--
:wq
^X^Cy^K^X^C^C^C
From: eden on 25 Jul 2005 18:10
It could be this what you suggest (there are 2 lock bits set), but I
couldn't switch them off. Is there a way to turn them off?

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