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Problem with PortB0

 
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vladtess



Joined: 14 May 2011
Posts: 26

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Problem with PortB0
PostPosted: Tue Sep 13, 2011 6:02 pm     Reply with quote
Hi there. I'll get right to the meat:

Code:

#include <16F877A.h>
#INCLUDE <stdlib.h>
#include "LCD.h"
#fuses hs, nowdt, noput, nobrownout, nolvp, nocpd, nowrt, nodebug, noprotect
#use delay(clock=20000000)

//==========================



void main(void)
{
   for(;;){
      output_b(0xff);      
   }   
}


Now the whole B port should be high. Now the problem is that all pins are high (show 4.89Volts) except B0, which shows .56 volts. Anyone know why this may be. I've tried also to use other functions such as output_high(). This caused me a lot of trouble while working with an HD LCD series.

Why could this be? Thanks!!!
mbradley



Joined: 11 Jul 2009
Posts: 118
Location: California, USA

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PostPosted: Tue Sep 13, 2011 9:58 pm     Reply with quote
Just curious, without the lcd.h, same result?
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Michael Bradley
www.mculabs.com
Open Drivers and Projects
Ttelmah



Joined: 11 Mar 2010
Posts: 19506

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PostPosted: Wed Sep 14, 2011 1:57 am     Reply with quote
The obvious thing would be a short on the board. If you are using a PDIP chip, try the simple expedient of bending the leg out so B0 is not connected, test the code again, and see if B0 now goes high. If not, a magnifying glass, and looking for what is connected to B0, and for things like whisker shorts on the board. There is nothing electircally 'special' about B0 (no other peripherals on the pin on this chip version), so it really comes down to a short, or a damaged pin on the chip.

Best Wishes
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