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Problem using pins B5 and B6 of PIC18F2580

 
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teixeirafms



Joined: 07 May 2010
Posts: 1

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Problem using pins B5 and B6 of PIC18F2580
PostPosted: Wed Jun 02, 2010 11:00 am     Reply with quote
Hello,

I am working with a PIC18F2580 and I am trying to set the pins B5 and B6 as Output.

I am using the functions
Code:

OUTPUT_DRIVE(PIN_B5);
OUTPUT_DRIVE(PIN_B6);


If I do this
Code:

OUTPUT_LOW(PIN_B5);
OUTPUT_LOW(PIN_B6);

Both pins have 0V

If I do this
Code:

OUTPUT_HIGH(PIN_B5);
OUTPUT_LOW(PIN_B6);

or
Code:

OUTPUT_LOW(PIN_B5);
OUTPUT_HIGH(PIN_B6);

both pins have about 0.7V.

If I do this:
Code:

OUTPUT_HIGH(PIN_B5);
OUTPUT_HIGH(PIN_B6);

Both pins go to 5V...

I have the following settings in the fuses:
Code:

//#device ICD=TRUE
#device adc=10
#device PASS_STRINGS=IN_RAM
#device HIGH_INTS=TRUE

#fuses WDT32768//WDT128                   //Watch Dog Timer uses 1:128 Postscale
#fuses INTRC_IO                 //IO
#fuses NOPROTECT                //Code not protected from reading
#fuses NOIESO                   //Oscillator switching is disabled, main oscillator is source
#fuses BROWNOUT                 //Reset when brownout detected
//#FUSES BORV21                   //Brownout reset at 2.0V
#fuses PUT                      //Power Up Timer
#fuses STVREN                   //Stack full/underflow will cause reset
#fuses NODEBUG                    //Debug mode for use with ICD
#fuses NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#fuses NOWRT                    //Program memory not write protected
#fuses NOWRTD                   //Data EEPROM not write protected
#fuses NOWRTB                   //Boot block not write protected
#fuses NOWRTC                   //configuration not registers write protected
#fuses NOCPD                    //No EE protection
#fuses NOCPB                    //No Boot Block code protection
#fuses NOEBTR                   //Memory not protected from table reads
#fuses NOEBTRB                  //Boot block not protected from table reads

Can anyone help me on this?

Thanks
bkamen



Joined: 07 Jan 2004
Posts: 1611
Location: Central Illinois, USA

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PostPosted: Wed Jun 02, 2010 11:04 am     Reply with quote
looks like you have them connected together maybe?

-Ben
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jun 02, 2010 11:19 am     Reply with quote
Post a description of the external circuits connected to these two pins.
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