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Comparator 16F628A not working

 
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tenebris



Joined: 15 Mar 2018
Posts: 2

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Comparator 16F628A not working
PostPosted: Thu Mar 15, 2018 8:51 am     Reply with quote
Hello! I'm using the 5.07v compiler, and trying to make C2OUT work with the argument NC_NC_A1_A2 but nothing happens...

Code:

#include <16f628a.h>
#fuses INTRC_IO, NOWDT, NOPROTECT, NOMCLR, NOBROWNOUT, PUT, NOLVP
#use delay(clock=4000000)

void main()
{
setup_comparator (NC_NC_A1_A2);

   while(TRUE){
      if (C2OUT)
      output_high(PIN_A5);
     
      else
      output_low(PIN_A5);
   }

}


And this is what the .lst looks like:
Code:

.................... setup_comparator (NC_NC_A1_A2);
000D:  MOVLW  05
000E:  MOVWF  1F
000F:  BSF    03.5
0010:  MOVF   05,W
0011:  IORLW  06
0012:  MOVWF  05
0013:  MOVLW  03
0014:  MOVWF  77
0015:  DECFSZ 77,F
0016:  GOTO   015
0017:  BCF    03.5
0018:  MOVF   1F,W
0019:  BCF    0C.6


I know this is a very simple problem, but I can't figure whats going wrong. The circuit is: Pot 10K on A2, LDR on A1, and a led on A5
Nothing happens in Proteus, too...


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PCM programmer



Joined: 06 Sep 2003
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PostPosted: Thu Mar 15, 2018 10:59 am     Reply with quote
Look at this table in the 16F628A data sheet, on page 13:
Quote:
TABLE 3-2: PIC16F627A/628A/648A PINOUT DESCRIPTION

What does it list in the "Output Type" column for RA5 ?

Data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/40044G.pdf
temtronic



Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario

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PostPosted: Thu Mar 15, 2018 2:12 pm     Reply with quote
or look at the pinout diagrams...
they clearly show with arrows possible data directions..
tenebris



Joined: 15 Mar 2018
Posts: 2

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PostPosted: Thu Mar 15, 2018 8:35 pm     Reply with quote
thank you all
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