AVR-Chat

Hello!
I build project on AVRStudio 4.16 and WinAVR.
I try handle  high level on PCINT8-11.

PORTB=0x00;
DDRB=0xF0;

EICRA=0x02;
EIMSK=0x01;
EIFR=0x01;
PCMSK1=0x0F;
PCICR=0x02;
PCIFR=0x02;

ISR(PCINT1_vect)
{
  unsigned char x = PORTB;
  if ((x & Bit(0)) == 1)
  {
     ...
  }
  if ((x & Bit(1)) == 1)
  {
    ...
  }
  if ((x & Bit(2)) == 1)
  {
    ...
  }
  if ((x & Bit(3)) == 0)
  {
     ...
  }
}

It doesn't work.
Any idea?

-- 
Best regards,
Roman Antoshchenkov
mailto:djantoxa@rambler.ru