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PIC16f526 PIN C5 output

 
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aldina



Joined: 09 Oct 2009
Posts: 26

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PIC16f526 PIN C5 output
PostPosted: Wed Sep 15, 2021 2:12 am     Reply with quote
Hello all,

I can't use PIN C5 of PIC16f526 as output. I've fixed this pin as output port but when I use OUTPUT_HIGH(PIN_C5) nothing happen.
Code:

##include <16F526.h>
#device ADC=8
#fuses INTRC,WDT,MCLR,PROTECT
#use delay(clock=8000000)
#use fixed_io (c_outputs = pin_c5)
#use fixed_io (b_outputs = pin_b5)

void main()
{
   int8 RH_Signal, LH_Signal;
   
   setup_comparator(NC_NC_NC_NC);
   
   setup_adc_ports(PIN_B0);
   setup_adc_ports(PIN_B1);
   setup_adc(ADC_CLOCK_DIV_16);
   
   output_low(PIN_B5); //sector Lateral Direito
   output_low(PIN_C5); //sector Lateral Esquerdo
   
   while (true)
   {
      restart_wdt();
     
      RH_Signal = 0;
      LH_Signal = 0;
     
      RH_Signal = Right();
      LH_Signal = Left();
     
      if(RH_Signal >= 50 && LH_Signal >= 50)
      {
         if(input(PIN_B2) == 1 || input(PIN_C0) == 1)
         {
            OUTPUT_HIGH(PIN_B5); // ON - Right Light output
            OUTPUT_HIGH(PIN_C5); // ON - Left Light output
            T_OFF4();
         }
         else if(input(PIN_B2) == 0 && input(PIN_C0) == 0)
         {
            OUTPUT_HIGH(PIN_B5); // ON - Right Light output
            OUTPUT_HIGH(PIN_C5); // ON - Left Light output
            T_OFF4();
         }
      }
   }
}

Can someone help me? Why Pin C5 doesn't come HIGH state?
Thanks,
Ttelmah



Joined: 11 Mar 2010
Posts: 19549

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PostPosted: Wed Sep 15, 2021 2:32 am     Reply with quote
Key here is the data sheet.
If you look at C5, and table 6-3, you will see that the priority on this pin has
the timer0 input taking priority over the standard I/O functions. You need to
turn this off. Setting Timer0, to use the internal clock should disable this
input selection.

setup_timer_0(T0_INTERNAL);

If you look at Register 4-2, you will see that the default on power on, is
to set the T0CS bit to '1', which has the Timer0 input selected.
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