AVR-Chat

When running your processor as a master you can freely use the SS pin AS
LONG AS it's an OUTPUT
You can use it for driving slave SS pins or anything else.
 
Regards
lasse
 
 
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From: Don Kinzer [mailto:dkinzer@easystreet.com] 
Sent: 3. februar 2005 17:05
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] Re: Mega16 SPI master, can the SS pin be used for other
stuff?
 

--- In AVR-Chat@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@g...> wrote:
> simple question, i want to use the SPI on the mega16 in DIL40.
> Normally if i want a device to be master only i'd tie SS_not high.
> 
> Now, i'm kind of tight on pins already, so i would like to use
> SS_not as a digital IO pin, i just want to be sure i can do that. .
> Please tell me if SPI will work correctly without using this pin
> for it.

As I read the documentation, you can use PB4 as a general output 
while using SPI in master mode.  Of course, you still need some way 
to drive the slave's SS/ input.

It also says, "If SS/ is configured as an input, it must be held high 
to ensure SPI Master operation."

This is from the 12/03 version of the Mega16 PDF, page 138.





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