Wayne Howell

Mode pins

Discussion created by Wayne Howell on Jun 21, 2007
Latest reply on Jun 21, 2007 by Daniel Lundin
Hi,
 
I'm using the NE64 part.
 
Does any one have any advise on using the Port E pins that are used for ModA/B/C during boot.
 
The problem is that I cannot define the state of these pins during boot as they are connected to bcd switches.
 
I could add some circuitry to swap between by circuit and open pins during boot, but that is quite a lot of work.
 
I'm wondering if anyone has come up with a cute solution?
 
Also is there any may that I can disable checking the Mode pins during boot (I'd be happy for mode to be configured when I program the part)?
 
Final question: I cannot find in the data sheet whether the Mode pins define open circuit as a logic 1. I'm not clear on whether I select mode by tying the pin hi/lo or open/lo.
 
Any help much appreciated.
 
Regards
 
Wayne

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