Programming AVRs with AVRISP when using the SPI bus at the same time?

Hi

I would like to ask a question because i would like to make sure before
i try. I currently using a AVRISP programmer from Atmel which uses the
SPI to program the AVR. And i want to also use the SPI for
communication with a SD Card. I am wondering if there could be an
issue. Because one of my friends that have the same programmer was
using the programmer and EEPROM through the SPI and something has
cooked his programmer. Would there be any electrical issues with both
these devices connected to the same pins? Should there be some inline
resisters?

I would just like to know if anyone knows about this before i go trying
what i intend to do.

Thanks for your help

Scotty

> I would like to ask a question because i would like to make sure before
> i try. I currently using a AVRISP programmer from Atmel which uses the
> SPI to program the AVR. And i want to also use the SPI for
> communication with a SD Card. I am wondering if there could be an

I'm using exactly the same configuration with simple resistor interface
to the SD (MMC) card. I don't see what problem it could cause. The SD
card is deselected while you program the AVR.

Thanks

I just wanted to make sure as i did not really want to distroy my
programmer.

Scotty

> I just wanted to make sure as i did not really want to distroy my
> programmer.

Be careful of target vs. program cable power. I tend to leave the Vcc
line disconnected on my ISP connector. When I'm laying out a PCB with
ISP, I put a zero ohm resistor on that line, and don't normally stuff
it. That way the board won't be powered by the debugger, and the
debugger won't fight the board's PSU.