AVR-Chat

--- In AVR-Chat@yahoogroups.com, Bruce Parham <obparham@...> wrote:
> The data sheet just says, if it's an input, it should be high to
> keep the port in master mode.
If the SS pin doesn't have a pullup on it, it could be floating low enough to trigger the Master-to-Slave transition between the time when the controller is enabled and the SS bit is made an output.

In any event, it is best to set the SS pin direction and state *before* enabling the controller as Bruce advised.

Don Kinzer
ZBasic Microcontrollers
http://www.zbasic.net