AVR-Chat

It is near 4.5V, I don't think exact value matters.
Yes to small cap.
I tried all levels of BOD with no difference.

The other chips are varied in their power (voltage) requirements, I use level converters for some, but I don't see how that matters when the microcontroller is an SPI master and it gets stuck sending data (the flag never gets set or cleared, whichever is the case).

I'll have to leave it at that, use the watchdog workaround.

Thanks everybody for your help.

Cat

> To: AVR-Chat@yahoogroups.com
> From: samperi@ampertronics.com.au
> Date: Sat, 13 Mar 2010 12:09:41 +1100
> Subject: RE: [AVR-Chat] Re: Code stuck waiting for SPI transmission but  only after power-up
> 
> At 09:53 AM 13/03/2010, you wrote:
> >4.5V It's complicated why :-)
> 
> No, it makes sense. So you have about 0.5V-0.7V headroom
> which should be OK. Have you measured that it is 4.5V? ie
> is the R1/R2 divider calculated correctly for 4.5V and do
> you have the small cap there also?
> 
> I would not set the BOD at say, 4.3V but somewhat lower
> depending on the chip used.
> 
> ************************
> ADDITION and of course make sure that the rest of the chips
> are happy at 4.5V and don't have a minimum of 4.75V.
> 
> Regards
> 

 		 	   		  

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