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Re: [AVR-Chat] Pull down resistors??

2005-09-01 by Roy E. Burrage

Unless we're discussing HP equipment. They always, ALWAYS, used negative true logic and conventional current flow. Not sure what they do now.


REB

John Samperi wrote:
At 04:15 AM 1/09/2005, you wrote:
  
Ummm - a low voltage (0v) is a logic zero. A high voltage (5v) is a
logic one.
      
   Not according to AVR data sheets, it's not.
    
The convention of using logic 0 for 0 volts
and logic 1 for a high (be it 5, 1, 3 12 or 100V)
was established before micro controller were thought
of and therefore it has nothing to do with Atmel.

Regards

John Samperi

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