#include <p18f4580.h>
#define mybit PORTBbits.RB0
#define SW PORTBbits.RB7
void T0PSDelay(unsigned char);
void main(void)
  {
    TRISBbits.TRISB7=1;
	TRISBbits.TRISB0=0;
    SW=1;
    while(1)
      {
        mybit^=1;		
        if(SW==0)		
          T0PSDelay(0);
        else
          T0PSDelay(1);
      }
  }
void T0PSDelay(unsigned char c)
  {
    T0CON=0x05;		
    if(c==0)
      {
       TMR0H=0xFF;		
	  TMR0L=0xD9;		
      }
    else
      {
	  TMR0H=0xFF;		
	  TMR0L=0xE6;		
      }
    T0CONbits.TMR0ON=1;			
    while(INTCONbits.TMR0IF==0);	
    T0CONbits.TMR0ON=0;			
    INTCONbits.TMR0IF=0;		
  }