AVR-Chat

HI Folks,

In Atmel's "AVR042: AVR Hardware Design Considerations" they recommend
putting resistors on the SPI lines to allow using the ISP feature
along with the application's use of the SPI port.

What they don't show is the value of the resistors.  Does anybody have
any recommendations for this?

Thanks,

Richard Cooke

On 4/11/07, Richard Cooke <rcooke@digitalwavelength.com> wrote:
> HI Folks,
>
> In Atmel's "AVR042: AVR Hardware Design Considerations" they recommend
> putting resistors on the SPI lines to allow using the ISP feature
> along with the application's use of the SPI port.
>
> What they don't show is the value of the resistors.  Does anybody have
> any recommendations for this?

I've used 4.7k,  basically you have to use large enough that the
programmer "wins" when it's connected.