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PIC18F2550 INT_RC

 
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ViperARG



Joined: 07 Jan 2017
Posts: 16

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PIC18F2550 INT_RC
PostPosted: Fri Jan 27, 2017 6:23 am     Reply with quote
Hi lads, I want to use the internal oscillator on 18f2550 but delays are not ok. Delays are critical in my project cause I need to use a range with delay_us.

Code:

#include <18F2550.h>
#fuses NOMCLR INTRC_IO
#use delay(clock = 8000000)
#use fast_io(A)


void main() {
  output_a(0);
  set_tris_a(8);

  while(TRUE){
 
     output_high(pin_A0);
     delay_ms(100);
     output_low(pin_A0);
     delay_ms(100);
  }
}



This is a test, which for some reason instead of blinking at 100 millisecond, blinks at 470 milliseconds. I now int osc is not precise as crystals, but like this.
Ttelmah



Joined: 11 Mar 2010
Posts: 19520

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PostPosted: Fri Jan 27, 2017 7:32 am     Reply with quote
Code:

#include <18F2550.h>
#fuses NOMCLR INTRC_IO
#use delay(INTERNAL = 8MHz)


The default clock rate for the internal oscillator is not the 8MHz branch. You have to specify this to be used.
However you are aware that the chip can't do USB with the internal oscillator?. Seems silly to be using a USB chip and then wasting this feature.....
ViperARG



Joined: 07 Jan 2017
Posts: 16

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PostPosted: Mon Jan 30, 2017 7:05 am     Reply with quote
Ttelmah wrote:
Code:

#include <18F2550.h>
#fuses NOMCLR INTRC_IO
#use delay(INTERNAL = 8MHz)


The default clock rate for the internal oscillator is not the 8MHz branch. You have to specify this to be used.
However you are aware that the chip can't do USB with the internal oscillator?. Seems silly to be using a USB chip and then wasting this feature.....


Im a starter on PIC's I been told to use Delphi for USB apps but I didn't manage to get it working, so Im starting with easier stuff...
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