Re: SPI with multiple microcontrollers

Seems to me that you would have to high z the SPI interface on the original
micro. You could do this in hardware with a tri-state buffer but this means
changing the wiring, which is what you asked to avoid. However there are
huge advantages to not changing the original software, based one how your
company handles software control and documentation.

Thomas

"Alexander Becher" <abecher@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:3j7ggvFng6c5U1@xxxxxxxxxxxxxxxxx
> Hello everyone,
>
> I am facing the following situation: I have a microcontroller (e.g.
> Atmel ATmega 128 or TI MSP430) connected via SPI to a flash memory chip
> (e.g. Atmel AT45DB014B or ST M25P80). I'd very much like to enable a
> second microcontroller to access the flash memory.
>
> The central question in this regard is: Can I add this second
> microcontroller to the bus without changing the software on the first
> microcontroller or the wiring to it? Or do I need some support for this
> configuration in the first uC?
>
> Obviously, I used Google with the wrong search terms, so I'm trying my
> luck here. I'd appreciate any replies.
>
> Regards
> Alexander Becher
>


.

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