Hello,
Below is my code, PIC18F4550

#include <p18f4550.h>
#include <usart.h>
#include <delays.h>
 
void LED1(void)
{
PORTDbits.RD0 = 0;
}
 
void main (void)
{
ADCON0bits.ADON=0;
ADCON1 = 0x07;
CMCON = 0x07;
//TRISA = 0x00;
TRISD = 0x00;
//PORTDbits.RD0 = 0;
//INTCON: INTERRUPT CONTROL REGISTER
TRISB = 0xFF;
INTCONbits.GIEH = 0; //clear interrupt
INTCONbits.GIEH = 1; //enable interrupt
INTCONbits.INT0IE = 1; //an external interrupt will occur when there is a change state in PORTB pins
//INTCONbits.RBIE = 0;
INTCONbits.RBIE = 1; //enables the RB port change interrupt
INTCONbits.INT0IF == 0;
INTCON2bits.INTEDG0 = 1; //interrupt will be triggered when on rising edge
//INTCONbits.INT0IF = 1;//enable interrupt on RB0
 
if(INTCONbits.INT0IF == 1)
//if(INTCONbits.RBIF == 1)
{
 //INTCONbits.RBIF == 0; //interrupts for INTCON <7:4>
 
 PORTDbits.RD0 = 1;
 Delay10KTCYx(100);
 PORTDbits.RD0 = 0;
 Delay10KTCYx(100);
 INTCONbits.INT0IF = 0;
 
}
else if (INTCONbits.INT0IF = 0)
{
 
 LED1();
}
 
}//end of main

Could you please check if my interrupt setup is correct? Thanks
By the way, how do you jump back to the subroutine that the PIC was running in C program?
Tom

 

Does it run in simulation?

Do you have an ICE or ICD? (In Circuit Emulator or In Circuit Debugger)

For PIC, it would be an ICExxxx unit, or for debuggers the ICD2 or PicKit 3