Hy.
I want to generate two diferent delays, using timer0 pic16f88.
step 1 : led 1 stay ON 4 sec
step 2 : led 1 stay OFF 3 sec

By the way I use a Matrix multimedia development board.

Look at my cod : in this moment the led 1 stay ON - 4 sec and then stay OFF
- 4 sec.
I know that my mistake is in interrupt function, but i am not able to
correct this mistake.=20

#include <system.h>
#pragma DATA _CONFIG1, _EXTRC_CLKOUT & _WDT_OFF & _LVP_OFF

unsigned int counter=3D0;

void interrupt()=20
{   =20
     if(intcon & 0x04)                      =20
     {                     =20
          clear_bit(intcon, 2);=20
          counter++;        =20
          if(counter =3D=3D 3906)          =20
          {
               portb =3D ~portb;
               counter=3D0;
          }
     }            =20
}

void main()
{
	trisb =3D 0xf0;
	portb =3D 0;
	tmr0 =3D 0;
	cmcon =3D 0x07;
	option_reg =3D 0b00000001;  // prescaler =3D 4
	intcon =3D 0b10100000;
	while(1)
	{
=09
	}=20
}



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