pic programmeren in C

program testinterrupt

symbol LED_run = PORTB.7                  ' LED_run is connected to PORTB pin 7
symbol LED_int = PORTB.6                  ' LED_int is connected to PORTB pin 6


sub procedure interrupt                   ' Interrupt service routine

  if INTCON.RBIF = 1 then                 ' Changes on RB4-RB7 ?
    INTCON.RBIF = 0

  else if INTCON.INTF = 1 then            ' External interupt (RB0 pin) ?
          LED_run = 0
          LED_int = 1
          Delay_ms(500)
          INTCON.INTF = 0

       else if INTCON.T0IF = 1 then       ' TMR0 interrupt occurred ?
               INTCON.T0IF = 0

            else if INTCON.EEIF = 1 then  ' Is EEPROM write cycle finished ?
                    INTCON.EEIF = 0

                 end if
            end if
        end if
  end if
end sub


main:

  TRISB = %00111111        ' Pins RB6 and RB7 are output
  OPTION_REG = %10000000   ' Turn off pull-up resistors
                           '     and set interrupt on falling edge
                           '     of RB0 signal
  INTCON = %10010000       ' Enable external interrupts
  PORTB = 0                ' Initial value on PORTB

eloop:                     ' While there is no interrupt, program runs in endless loop:
  LED_run = 1              '     LED_run is on
  LED_int = 0              '     LED_int is off
goto eloop

end.