[SOLVED] LED Blinking Working in Proteus But not in Real Harware MCU

#include<htc.h>
__CONFIG( FOSC_HS & WDTE_OFF & PWRTE_ON & CP_OFF & BOREN_ON 
      & LVP_OFF & CPD_OFF & WRT_ON & DEBUG_OFF);
#define _XTAL_FREQ   20000000
#define LED  RB0
void main(void)
{
   TRISB0 = 0;               // Make RB0 pin output
   LED    = 0;               // Make RB0 low
   while(1)
   {
      __delay_ms(500);       // Half sec delay
      LED = 0;               // LED off
      __delay_ms(500);       // Half sec delay
      LED = 1;               // LED on
   }
}

but i used four crystals(4MHz, 12MHz, 20MHz , 20MHz)

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pjmelect said:

What you have done looks good, The two possibilities as to why it does not work are the crystal not oscillating, try a simple RC oscillator instead, or you have not programed the configuration word correctly. Don't forget to turn off the watchdog timer and set the oscillator mode correctly.

Click to expand...

hemnath said:

Try the below program. Also, please check that you have selected correct configuration bits.

HTML:

#include<htc.h>
__CONFIG( FOSC_HS & WDTE_OFF & PWRTE_ON & CP_OFF & BOREN_ON 
      & LVP_OFF & CPD_OFF & WRT_ON & DEBUG_OFF);
#define _XTAL_FREQ   20000000
#define LED  RB0
void main(void)
{
   TRISB0 = 0;               // Make RB0 pin output
   LED    = 0;               // Make RB0 low
   while(1)
   {
      __delay_ms(500);       // Half sec delay
      LED = 0;               // LED off
      __delay_ms(500);       // Half sec delay
      LED = 1;               // LED on
   }
}

Please change new 20Mhz cystal and try it once.


When you use these crystals, you must also change it in coding.

Click to expand...