I added an external pullup resistor to it but it did not help.

Looking at it on the scope in does a saw tooth wave that peaks at about 1V
then a sharp drop.

I formated the subject wrong. I was notified that the : is required on the
subject line if I want the list to except it. Original message had the same
problem. Original message as follows.

I am having a very are time trying to get RA4 on a 73 to work as digital I/O.
What could be the problem? Here is my snipit of code that should work but
does not. I am using the Hi-Tech C compiler, 7.83 or so. My real program is
much larger then this and actualy does something but I need RA4 as an I/O
pin. I have tried 6 or so differnt chips and they all do the same thing.
Any ideas why this does not work?

void main()
{
   char TogelBit;

   OPTION = 0xC7;
   RBPU = 1; // Disable pullups on inputs, need to have put downs on them.
   T0CS = 0; // RA4 is an I/O pin

   ADON = 0; // Turn off ADC unit
   ADCON1 = 7; // Set Port A pins as I/O pins

   // Set the ports
   TRISA = 0x00;
   PORTA = 0;
   TRISB = 0xFF;
   TRISC = 0xFF;

  TogelBit = 1;
  while(1)
  {
      RA4 = TogelBit;

      if(TogelBit == 1)
      {
         TogelBit = 0;
      } else
      {
         TogelBit = 1;
      }
   }
}
--
Roy Souther <roy@silicontao.com>

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